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Electrolyte hydration energy as a universal descriptor for ion-specific capacitance:insights from interpretable machine learning 认领 引用 被引量：1
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作者 Elham Rahmanian Ali Sajedi-Moghaddam +1 位作者 Mohammad Taha Homeizavi Seyed Hamed Aboutalebi 《Advanced Powder Materials》 EI CAS CSCD 2026年第1期157-168,共12页
The rational design of high-performance electrochemical energy storage devices critically depends on a fundamental understanding of ion-electrode interactions at the molecular scale.Herein,we employ interpretable mach... The rational design of high-performance electrochemical energy storage devices critically depends on a fundamental understanding of ion-electrode interactions at the molecular scale.Herein,we employ interpretable machine learning(ML)to reveal electrolyte hydration energy as a universal descriptor governing ion-specific capacitance in two-dimensional(2D)materials.Through explainable ML,we elucidate how ion hydration shell stability and size critically influence charge transport and storage at the electrode-electrolyte interface.Our analysis identifies hydration energy-not ionic size-as the primary factor dictating capacitance,challenging prevailing assumptions and providing quantifiable design rules for electrolyte selection.These insights offer a data-driven pathway to optimize 2D materials for supercapacitors and beyond,including batteries and electrocatalytic systems.This work demonstrates the power of explainable artificial intelligence in uncovering molecular-level mechanisms that accelerate the discovery and development of next-generation energy storage technologies. 展开更多
关键词 Machine learning Hydration energy Supercapacitors 2D materials Capacitance
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Uncovering the catalyst/electrolyte interfacial process by frequency dispersion of capacitance 认领 引用
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作者 Jinzhen Huang Erica D.Clinton +3 位作者 Kenneth Crossley Juliana Bruneli Falqueto Thomas J.Schmidt Emiliana Fabbri 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2025年第9期199-209,I0007,共11页
Electrochemical impedance spectroscopy(EIS)is a widely used technique to monitor the electrical properties of a catalyst under electrocatalytic conditions.Although it is extensively used for research in electrocatalys... Electrochemical impedance spectroscopy(EIS)is a widely used technique to monitor the electrical properties of a catalyst under electrocatalytic conditions.Although it is extensively used for research in electrocatalysis,its effectiveness and power have not been fully harnessed to elucidate complex interfacial processes.Herein,we use the frequency dispersion parameter,n,which is extracted from EIS measurements(Cs=afn+1,-2<n<-1),to describe the dispersion characteristics of capacitance and interfacial properties of Co3O4 before the onset of oxygen evolution reaction(OER)in alkaline conditions.We first prove that the n-value is sensitive to the interfacial electronic changes associated with Co redox processes and surface reconstruction.The n-value decreases by increasing the specific/active surface area of the catalysts.We further modify the interfacial properties by changing different components,i.e.,replacing the proton with deuterium,adding ethanol as a new oxidant,and changing the cation in the electrolyte.Intriguingly,the n-value can identify different influences on the interfacial process of proton transfer,the decrease and blocking of oxidized Co species,and the interfacial water structure.We demonstrate that the n-value extracted from EIS measurements is sensitive to the kinetic isotope effect,electrolyte cation,adsorbate surface coverage of oxidized Co species,and the interfacial water structure.Thus,it can be helpful to differentiate the multiple factors affecting the catalyst interface.These findings convey that the frequency dispersion of capacitance is a convenient and useful method to uncover the interfacial properties under electrocatalytic conditions,which helps to advance the understanding of the interfaceactivity relationship. 展开更多
关键词 Frequency dispersion of capacitance Electrochemical impedance spectroscopy Catalyst/electrolyte interface Interfacial capacitance Oxygen evolution reaction
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Capacitance decay mechanism of vanadium nitride supercapacitor electrodes in KOH electrolytes 认领 引用 被引量：2
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作者 Xiu-Li Li Hao Song +7 位作者 Yong-Hui Zhang Yu-Lei Ren Qi-Fei Guo Zi-Huan Tang Zhuo Li Biao Gao Paul K.Chu Kai-Fu Huo 《Rare Metals》 SCIE EI CAS CSCD 2025年第6期3909-3919,共11页
Vanadium nitride(VN)is a promising pseudocapacitive material due to the high theoretical capacity,rapid redox Faradaic kinetics,and appropriate potential window.Although VN shows large pseudocapacitance in alkaline el... Vanadium nitride(VN)is a promising pseudocapacitive material due to the high theoretical capacity,rapid redox Faradaic kinetics,and appropriate potential window.Although VN shows large pseudocapacitance in alkaline electrolytes,the electrochemical instability and capacity degradation of VN electrode materials present significant challenges for practical applications.Herein,the capacitance decay mechanism of VN is investigated and a simple strategy to improve cycling stability of VN supercapacitor electrodes is proposed by introducing VO43-anion in KOH electrolytes.Our results show that the VN electrode is electrochemical stabilization between-1.0and-0.4 V(vs.Hg/Hg O reference electrode)in 1.0 MKOH electrolyte,but demonstrates irreversible oxidation and fast capacitance decay in the potential range of-0.4 to0 V.In situ electrochemical measurements reveal that the capacitance decay of VN from-0.4 to 0 V is ascribed to the irreversible oxidation of vanadium(V)of N–V–O species by oxygen(O)of OH-.The as-generated oxidization species are subsequently dissolved into KOH electrolytes,thereby undermining the electrochemical stability of VN.However,this irreversible oxidation process could be hindered by introducing VO43-in KOH electrolytes.A high volumetric specific capacitance of671.9 F.cm-3(1 A.cm-3)and excellent cycling stability(120.3%over 1000 cycles)are achieved for VN nanorod electrode in KOH electrolytes containing VO43-.This study not only elucidates the failure mechanism of VN supercapacitor electrodes in alkaline electrolytes,but also provides new insights into enhancing pseudocapacitive energy storage of VN-based electrode materials. 展开更多
关键词 Vanadium nitride Capacitance decay Pseudocapacitance Oxidation mechanism Supercapacitors
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Effects of noise on fluidized bed characteristics measurements by electrical capacitance tomography 认领 引用
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作者 Kai Huang Chunlei Pei +4 位作者 Shuanghe Meng Wuqiang Yang Hua Li Mao Ye Jinlong Gong 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第3期219-233,共15页
Noise is inevitable in electrical capacitance tomography(ECT)measurements.This paper describes the influence of noise on ECT performance for measuring gas-solids fluidized bed characteristics.The noise distribution is... Noise is inevitable in electrical capacitance tomography(ECT)measurements.This paper describes the influence of noise on ECT performance for measuring gas-solids fluidized bed characteristics.The noise distribution is approximated by the Gaussian distribution and added to experimental capacitance data with various intensities.The equivalent signal strength(Ф)that equals the signal-to-noise ratio of packed beds is used to evaluate noise levels.Results show that the Pearson correlation coefficient,which indicates the similarity of solids fraction distributions over pixels,increases with Ф,and reconstructed images are more deteriorated at lower Ф.Nevertheless,relative errors for average solids fraction and bubble size in each frame are less sensitive to noise,attributed to noise compromise caused by the process of pixel values.These findings provide useful guidance for assessing the accuracy of ECT measurements of multiphase flows. 展开更多
关键词 Noise Electrical capacitance tomography Fluidized bed Signal-to-noise ratio Measurement
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Web-in-web carbon cathode design unlocking high area capacitance and high-rate performance for Zn-ion hybrid supercapacitors 认领 引用
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作者 Qian Gong João Cunha +6 位作者 Liming Zhao Zhipeng Yu Xiaoyu Zhang Shunrui Luo Najeeb ur Rehman Lashari Xiaona Wang Yurong Zhou 《Rare Metals》 SCIE EI CAS CSCD 2025年第10期7281-7292,共12页
Zn-ion hybrid supercapacitors(ZHSCs),as emerging energy storage systems,combine high energy and power density with cost-effectiveness and safety,attracting significant attention.However,due to the inherent energy stor... Zn-ion hybrid supercapacitors(ZHSCs),as emerging energy storage systems,combine high energy and power density with cost-effectiveness and safety,attracting significant attention.However,due to the inherent energy storage mechanism and the diminishing marginal benefits of increased porosity on capacitance,engineering porous nanostructures to develop carbon materials with ideal architectures is crucial for achieving high performance.Herein,a novel web-in-web porous carbon/carbon nanotubes(CNTs)composite has been proposed,fabricated by a simple phase separation method and two-step carbonization.During pre-oxidation,gradual air oxidation induces the formation of an O,N co-doped polymer-chain template,which subsequently transforms into a graphitized web during high-temperature carbonization.The optimized web-in-web structure,enriched with abundant active sites,accelerates mass transport and charge transfer kinetics.When assembled in ZHSCs,the web-in-web cathode achieved a high area capacitance(14,309 mF cm-2)with high mass loading(38.2 mg cm-2).It delivered excellent high-rate performance at 50 mA cm-2with a capacitance retention of 83%after 10,000 cycles,also boosting a high energy density(1452.7μWh cm-2)and power density(30.8 mW cm-2).Furthermore,ex situ characterization and in situ electrochemical analyses reveal hybrid energy storage mechanisms,involving both physical/chemical adsorption and precipitation/dissolution across different potential regions.This study provides a promising strategy for designing high-area-capacitance carbon cathodes boosting high-performance ZHSCs. 展开更多
关键词 Carbon nanotubes Zn-ion hybrid supercapacitors Area capacitance Rate performance
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Mechanical manipulation of the transient negative capacitance effect in resistor-ferroelectric capacitor circuit 认领 引用
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作者 Qian He Weijin Chen +1 位作者 Xin Luo Yue Zheng 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2025年第2期237-246,共10页
Transient negative capacitance(NC),as an available dynamic charge effect achieved in resistor-ferroelectric capacitor(R-FEC)circuits,has triggered a series of theoretical and experimental works focusing on its physica... Transient negative capacitance(NC),as an available dynamic charge effect achieved in resistor-ferroelectric capacitor(R-FEC)circuits,has triggered a series of theoretical and experimental works focusing on its physical mechanism and device application.Here,we analytically derived the effects of different mechanical conditions on the transient NC behaviors in the R-FEC circuit based on the phenomenological model.It shows that the ferroelectric capacitor can exhibit either NC(i.e.,“single NC”and“double NC”)or positive capacitance,depending on the mechanical condition and temperature.Further numerical calculations show that the voltage drop caused by NC can be effectively controlled by temperature,applied stress,or strain.The relationship between NC voltage drop and system configurations including external resistance,dynamical coefficient of polarization,and input voltage are presented,showing diverse strategies to manipulate the NC effect.These results provide theoretical guidelines for rational design and efficient control of NC-related electronic devices. 展开更多
关键词 Ferroelectric Transient negative capacitance Mechanical manipulation
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Research on the distributed capacitance for high-voltage key components on CRAFT NNBI 认领 引用
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作者 Bo LIU Zhimin LIU +8 位作者 Caichao JIANG Sheng LIU Junjun PAN Shiyong CHEN Wei WEI Yuchen QU Lizhen LIANG Ruoxin BAI Yuanlai XIE 《Plasma Science and Technology》 SCIE EI CSCD 2025年第4期58-63,共6页
The negative ion based neutral beam injector(NNBI)with a beam energy of 400 keV is one of the subsystems at the Comprehensive Research fAcility for Fusion Technology(CRAFT)in China.The distributed capacitance of the h... The negative ion based neutral beam injector(NNBI)with a beam energy of 400 keV is one of the subsystems at the Comprehensive Research fAcility for Fusion Technology(CRAFT)in China.The distributed capacitance of the high-voltage components is an important basis for the design of surge suppression devices at CRAFT NNBI.This study conducted calculations of distributed capacitance for the key components,including the high-voltage deck,transmission line and isolation transformer in the power supply system using the finite element method.The relationship between the high-voltage deck(HVD)distributed capacitance and the distance from the wall is discussed.The differences in distributed capacitance and energy storage between noncoaxial and coaxial transmission lines are also debated.Finally,the capacitance between the primary and secondary windings of the-400 kV isolation transformer,as well as between the secondary winding and the oil tank casing,was calculated. 展开更多
关键词 NNBI power supply system direct-current high voltage distributed capacitance finite elements analysis(Some figures may appear in colour only in the online journal)
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Morphologically engineered mixed metal oxides on carbon fibers as a binder-free electrode for diffusion capacitance-dominated hybrid supercapacitors 认领 引用 被引量：1
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作者 Mohammad Arishi 《Rare Metals》 SCIE EI CAS CSCD 2025年第11期8548-8564,共17页
Engineering the morphology of spinel mixed metal oxides is a critical strategy for developing highperformance hybrid supercapacitors as they enhance both energy storage performance and cyclic stability.Herein,we prese... Engineering the morphology of spinel mixed metal oxides is a critical strategy for developing highperformance hybrid supercapacitors as they enhance both energy storage performance and cyclic stability.Herein,we present a simple,binder-free method to fabricate hierarchical,pineapple-like CuCo2O4nanostructures on carbon fibers via low-temperature wet-chemical method.By utilizing a combination of hexamine and urea,we tailored the morphology and crystallinity of CuCo2O4,improving ion accessibility and interconnectivity,which led to superior electrochemical performance compared to individual components.Particularly,the pineapple-like CuCo2O4demonstrated diffusion-dominated behavior,achieving a higher specific capacitance of 745 F g-1at 1 A g-1and excellent cycling stability.Moreover,a hybrid supercapacitor was fabricated using diffusion-type CuCo2O4electrode and activated carbon as the capacitive electrode,which exhibited good synergy in delivering excellent energy storage performance.The device achieved a specific capacity of 140.5 C g-1at 0.5 A g-1and an energy density of 45.5 Wh kg-1with a high-power density of5950 W kg-1.Even at a high current density of 10 A g-1,the hybrid supercapacitor maintained excellent rate capability and remarkable cycling stability(89.6%retention after 10,000 cycles),demonstrating efficient charge storage and transfer.Benefiting from high voltage and energy density,the fabricated hybrid supercapacitors successfully powered various LEDs,illustrating their potential for real-world applications.Our work demonstrates the importance of spinal-type nanostructure engineering to achieve enhanced electrochemical performance,providing a straightforward pathway for developing next-generation supercapacitors and battery materials. 展开更多
关键词 Morphology Spinal oxides Specific capacitance Diffusion Hybrid supercapacitor Energy density
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Evaluation of dynamic inter-well connectivity by using the state-variable-capacitance model 认领 引用
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作者 Li-Wen Guo Shi-Yuan Qu +2 位作者 Yuan-Yuan Lei Zhi-Hong Kang Shuo-Liang Wang 《Petroleum Science》 SCIE EI CAS CSCD 2025年第8期3380-3396,共17页
During oilfield development,a comprehensive model for assessing inter-well connectivity and connected volume within reservoirs is crucial.Traditional capacitance(TC)models,widely used in inter-well data analysis,face ... During oilfield development,a comprehensive model for assessing inter-well connectivity and connected volume within reservoirs is crucial.Traditional capacitance(TC)models,widely used in inter-well data analysis,face challenges when dealing with rapidly changing reservoir conditions over time.Additionally,TC models struggle with complex,random noise primarily caused by measurement errors in production and injection rates.To address these challenges,this study introduces a dynamic capacitance(SV-DC)model based on state variables.By integrating the extended Kalman filter(EKF)algorithm,the SV-DC model provides more flexible predictions of inter-well connectivity and time-lag efficiency compared to the TC model.The robustness of the SV-DC model is verified by comparing relative errors between preset and calculated values through Monte Carlo simulations.Sensitivity analysis was performed to compare the model performance with the benchmark,using the Qinhuangdao Oilfield as a case study.The results show that the SV-DC model accurately predicts water breakthrough times.Increases in the liquid production index and water cut in two typical wells indicate the development time of ineffective circulation channels,further confirming the accuracy and reliability of the model.The SV-DC model offers significant advantages in addressing complex,dynamic oilfield production scenarios and serves as a valuable tool for the efficient and precise planning and management of future oilfield developments. 展开更多
关键词 Capacitance model Inter-well connectivity Time-lag coefficient Connected volume Reservoir simulation
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Enhanced specific capacitance of supercapacitors using wide band gap NdCrO3 and NdCrO3/graphene oxide nanocomposites 认领 引用
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作者 Rabia Siddiqui Malika Rani +4 位作者 Akram Ibrahim Aqeel Ahmed Shah Aamir Razaq Shehar Bano M.Ajmal Khan 《Journal of Rare Earths》 SCIE EI CAS CSCD 2025年第10期2231-2237,I0006,共7页
Neodymium chromium oxide(NdCrO3)and NdCrO3/graphene oxide(GO)nanocomposite were synthesized via sol-gel and co-precipitation techniques for being used in high-perfo rmance supercapacitors and for the possible ap... Neodymium chromium oxide(NdCrO3)and NdCrO3/graphene oxide(GO)nanocomposite were synthesized via sol-gel and co-precipitation techniques for being used in high-perfo rmance supercapacitors and for the possible application in ultraviolet(UV)materials.Herein the systematic synthesis approach was adopted,which enhances the optical and electrical properties of the grown wide band-gap composite nanomaterial.Structural characterization of the grown materials was attempted using X-ray diffraction(XRD)and scanning electron microscopy(SEM).Most importantly the electrochemical analysis of the grown samples was carried out by employing a glassy carbon electrode and 3 mol/L KOH electrolyte,which demonstrates significant improvements in a specific capacitance of approximately360 F/g,an energy density of approximately 18 Wh/kg,and a maximum power density of approximately 257 W/kg,respectively.Moreover,NdCrO3/GO nanocomposite maintains a cyclic stability of 97.6%after4000 cycles.Photoluminescence(PL)spectroscopy confirms the wide bandgap nature of the NdCrO3and NdCrO3/GO nanocomposite,indicating its potential application in UVC devices.These findings emphasize the potential of the NdCrO3/GO nanocomposite in advancing efficient energy storage solutions and the possibility of being used in UVC technology. 展开更多
关键词 Neodymium chromium oxide(NdCrO3) NdCrO3/Graphene oxide(GO) nanocomposite Rare earths Energy storage devices Specific capacitance Wide band-gap nanocomposite
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Crystal-Collapse-Induced Synthesis of High-Capacitance LaCoOx/Co-Doped Carbon-Based Supercapacitors 认领 引用
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作者 Zhihao Deng Yuanbo Wang +5 位作者 Wu Shao Jingwen He Jie Sheng Ronghao Cen Yufei Fu Wenjun Wu 《Transactions of Tianjin University》 EI CAS 2025年第1期29-41,共13页
The development of high-performance,reproducible carbon(C)-based supercapacitors remains a significant challenge because of limited specific capacitance.Herein,we present a novel strategy for fabricating LaCoOx and... The development of high-performance,reproducible carbon(C)-based supercapacitors remains a significant challenge because of limited specific capacitance.Herein,we present a novel strategy for fabricating LaCoOx and cobalt(Co)-doped nanoporous C(LaCoOx/Co@ZNC)through the carbonization of Co/Zn-zeolitic imidazolate framework(ZIF)crystals derived from a PVP-Co/Zn/La precursor.The unique ZIF structure effectively disrupted the graphitic C framework,preserved the Co active sites,and enhanced the electrical conductivity.The synergistic interaction between pyridinic nitrogen and Co ions further promoted redox reactions.In addition,the formation of a hierarchical pore structure through zinc sublimation facili-tated electrolyte diffusion.The resulting LaCoOx/Co@ZNC exhibited exceptional electrochemical performance,delivering a remarkable specific capacitance of 2,789 F/g at 1 A/g and outstanding cycling stability with 92%capacitance retention after 3,750 cycles.Our findings provide the basis for a promising approach to advancing C-based energy storage technologies. 展开更多
关键词 Supercapacitor High capacitance Carbon electrode Doping Crystal-collapse
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Capacitance characteristics of metal-oxide-semiconductor capacitors with a single layer of embedded nickel nanoparticles for the application of nonvolatile memory 认领 引用 被引量：4
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作者 李卫 徐岭 +4 位作者 赵伟明 丁宏林 马忠元 徐骏 陈坤基 《Chinese Physics B》 SCIE EI CAS 2010年第4期408-412,共5页
This paper reports that metal-oxide-semiconductor （MOS） capacitors with a single layer of Ni nanopartictes were successfully fabricated by using electron-beam evaporation and rapid thermal annealing for application ... This paper reports that metal-oxide-semiconductor （MOS） capacitors with a single layer of Ni nanopartictes were successfully fabricated by using electron-beam evaporation and rapid thermal annealing for application to nonvolatile memory. Experimental scanning electron microscopy images showed that Ni nanoparticles of about 5 nm in diameter were clearly embedded in the SiO2 layer on p-type Si （100）. Capacitance-voltage measurements of the MOS capacitor show large flat-band voltage shifts of 1.8 V, which indicate the presence of charge storage in the nickel nanoparticles. In addition, the charge-retention characteristics of MOS capacitors with Ni nanoparticles were investigated by using capacitance-time measurements. The results showed that there was a decay of the capacitance embedded with Ni nanoparticles for an electron charge after 104 s. But only a slight decay of the capacitance originating from hole charging was observed. The present results indicate that this technique is promising for the efficient formation or insertion of metal nanoparticles inside MOS structures. 展开更多
关键词 metal-oxide-semiconductor capacitance-voltage capacitance time Ni nanoparticles
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Structure-guided Capacitance Relationships in Oxidized Graphene Porous Materials Based Supercapacitors 认领 引用
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作者 Srinivas Gadipelli Hanieh Akbari +4 位作者 Juntao Li Christopher A.Howard Hong Zhang Paul R.Shearing Dan J.L.Brett 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2023年第4期58-69,共12页
Supercapacitors formed from porous carbon and graphene-oxide(GO)materials are usually dominated by either electric double-layer capacitance,pseudo-capacitance,or both.Due to these combined features,reduced GO material... Supercapacitors formed from porous carbon and graphene-oxide(GO)materials are usually dominated by either electric double-layer capacitance,pseudo-capacitance,or both.Due to these combined features,reduced GO materials have been shown to offer superior capacitance over typical nanoporous carbon materials;however,there is a significant variation in reported values,ranging between 25 and 350 F g−1.This undermines the structure(e.g.,oxygen functionality and/or surface area)-performance relationships for optimization of cost and scalable factors.This work demonstrates important structure-controlled charge storage relationships.For this,a series of exfoliated graphene(EG)derivatives are produced via thermal-shock exfoliation of GO precursors and following controlled graphitization of EG(GEG)generates materials with varied amounts of porosity,redox-active oxygen groups and graphitic components.Experimental results show significantly varied capacitance values between 30 and 250 F g−1at 1.0 A g−1in GEG structures;this suggests that for a given specific surface area the redox-active and hydrophilic oxygen content can boost the capacitance to 250–300%higher compared to typical mesoporous carbon materials.GEGs with identical oxygen functionality show a surface area governed capacitance.This allows to establish direct structure-performance relationships between 1)redox-active oxygen functional concentration and capacitance and 2)surface area and capacitance. 展开更多
关键词 electric double-layer capacitance graphene-oxide pseudocapacitance structure-performance relationships supercapacitors
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Instability of parasitic capacitance in T-shape-gate enhancementmode AlGaN/GaN MIS-HEMTs 认领 引用 被引量：2
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作者 Lan Bi Yixu Yao +9 位作者 Qimeng Jiang Sen Huang Xinhua Wang Hao Jin Xinyue Dai Zhengyuan Xu Jie Fan Haibo Yin Ke Wei Xinyu Liu 《Journal of Semiconductors》 EI CAS CSCD 2022年第3期74-77,共4页
Parasitic capacitances associated with overhangs of the T-shape-gate enhancement-mode(E-mode)GaN-based power device,were investigated by frequency/voltage-dependent capacitance-voltage and inductive-load switching mea... Parasitic capacitances associated with overhangs of the T-shape-gate enhancement-mode(E-mode)GaN-based power device,were investigated by frequency/voltage-dependent capacitance-voltage and inductive-load switching measurements.The overhang capacitances induce a pinch-off voltage distinguished from that of the E-mode channel capacitance in the gate capacitance and the gatedrain capacitance characteristic curves.Frequency-and voltage-dependent tests confirm the instability caused by the trapping of interface/bulk states in the LPCVD-SiNx passivation dielectric.Circuit-level double pulse measurement also reveals its impact on switching transition for power switching applications. 展开更多
关键词 AlGaN/GaN MIS-HEMTs enhancement-mode T-shape gate parasitic capacitance trapping/de-trapping capacitancevoltage hysteresis
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3D N,O-Codoped Egg-Box-Like Carbons with Tuned Channels for High Areal Capacitance Supercapacitors 认领 引用 被引量：25
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作者 Feng Wei Xiaojun He +3 位作者 Lianbo Ma Hanfang Zhang Nan Xiao Jieshan Qiu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2020年第7期1-12,共12页
Functional carbonaceous materials for supercapacitors(SCs)without using acid for post-treatment remain a substantial challenge.In this paper,we present a less harmful strategy for preparing three-dimensional(3D)N,O-co... Functional carbonaceous materials for supercapacitors(SCs)without using acid for post-treatment remain a substantial challenge.In this paper,we present a less harmful strategy for preparing three-dimensional(3D)N,O-codoped egg-box-like carbons(EBCs).The as-prepared EBCs with opened pores provide plentiful channels for ion fast transport,ensure the e ective contact of EBCs electrodes and electrolytes,and enhance the electron conduction.The nitrogen and oxygen atoms doped in EBCs improve the surface wettability of EBC electrodes and provide the pseudocapacitance.Consequently,the EBCs display a prominent areal capacitance of 39.8μF cm-2(340 F g-1)at 0.106 m A cm-2 in 6 M KOH electrolyte.The EBC-based symmetric SC manifests a high areal capacitance to 27.6μF cm-2(236 F g-1)at 0.1075 m A cm-2,a good rate capability of 18.8μF cm-2(160 F g-1)at 215 m A cm-2 and a long-term cycle stability with only 1.9%decay after 50,000 cycles in aqueous electrolyte.Impressively,even in all-solid-state SC,EBC electrode shows a high areal capacitance of 25.0μF cm-2(214 F g-1)and energy density of 0.0233 m Wh cm-2.This work provides an acid-free process to prepare electrode materials from industrial by-products for advanced energy storage devices. 展开更多
关键词 Egg-box-like carbon Opened pores in pores Areal capacitance All-solid-state supercapacitor
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Enhancing Capacitance Performance of Ti3C2Tx MXene as Electrode Materials of Supercapacitor: From Controlled Preparation to Composite Structure Construction 认领 引用 被引量：23
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作者 Xiaobei Zang Jiali Wang +5 位作者 Yijiang Qin Teng Wang Chengpeng He Qingguo Shao Hongwei Zhu Ning Cao 《Nano-Micro Letters》 SCIE EI CAS CSCD 2020年第6期152-175,共24页
Ti3C2Tx,a novel two-dimensional layer material,is widely used as electrode materials of supercapacitor due to its good metal conductivity,redox reaction active surface,and so on.However,there are many challenges to be... Ti3C2Tx,a novel two-dimensional layer material,is widely used as electrode materials of supercapacitor due to its good metal conductivity,redox reaction active surface,and so on.However,there are many challenges to be addressed which impede Ti3C2Tx obtaining the ideal specific capacitance,such as restacking,re-crushing,and oxidation of titanium.Recently,many advances have been proposed to enhance capacitance performance of Ti3C2Tx.In this review,recent strategies for improving specific capacitance are summarized and compared,for example,film formation,surface modification,and composite method.Furthermore,in order to comprehend the mechanism of those efforts,this review analyzes the energy storage performance in different electrolytes and influencing factors.This review is expected to predict redouble research direction of Ti3C2Tx materials in supercapacitors. 展开更多
关键词 Ti3C2Tx MXene Capacitance performance Storage mechanism Electrode materials Supercapacitor
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An Ultra-microporous Carbon Material Boosting Integrated Capacitance for Cellulose-Based Supercapacitors 认领 引用 被引量：12
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作者 Chenfeng Ding Tianyi Liu +6 位作者 Xiaodong Yan Lingbo Huang Seungkon Ryu Jinle Lan Yunhua Yu Wei?Hong Zhong Xiaoping Yang 《Nano-Micro Letters》 SCIE EI CAS CSCD 2020年第5期78-94,共17页
A breakthrough in advancing power density and stability of carbon-based supercapacitors is trapped by inefficient pore structures of electrode materials.Herein,an ultramicroporous carbon with ultrahigh integrated capa... A breakthrough in advancing power density and stability of carbon-based supercapacitors is trapped by inefficient pore structures of electrode materials.Herein,an ultramicroporous carbon with ultrahigh integrated capacitance fabricated via one-step carbonization/activation of dense bacterial cellulose(BC)precursor followed by nitrogen/sulfur dual doping is reported.The microporous carbon possesses highly concentrated micropores(~2 nm)and a considerable amount of sub-micropores(<1 nm).The unique porous structure provides high specific surface area(1554 m^2 g^-1)and packing density(1.18 g cm^-3).The synergistic effects from the particular porous structure and optimal doping effectively enhance ion storage and ion/electron transport.As a result,the remarkable specific capacitances,including ultrahigh gravimetric and volumetric capacitances(430 F g^-1 and 507 F cm^-3 at 0.5 A g^-1),and excellent cycling and rate stability even at a high current density of 10 A g^-1(327 F g^-1 and 385 F cm^-3)are realized.Via compositing the porous carbon and BC skeleton,a robust all-solid-state cellulose-based supercapacitor presents super high areal energy density(~0.77 mWh cm^-2),volumetric energy density(~17.8 W L^-1),and excellent cyclic stability. 展开更多
关键词 Integrated capacitance Bacterial cellulose Microporous carbon Heteroatom doping Supercapacitors
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Porous and free-standing Ti3C2Tx-RGO film with ultrahigh gravimetric capacitance for supercapacitors 认领 引用 被引量：5
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作者 Yongzheng Fang Bowen Yang +8 位作者 Dongtong He Huipeng Li Kai Zhu Lin Wu Ke Ye Kui Cheng Jun Yan Guiling Wang Dianxue Cao 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第4期1004-1008,共5页
MXene-based electrode materials exhibit favorable supercapacitor performance in sulfuric acid due to praised pseudocapacitance charge storage mechanism.However,self-stacking of conventional MXene electrodes severely r... MXene-based electrode materials exhibit favorable supercapacitor performance in sulfuric acid due to praised pseudocapacitance charge storage mechanism.However,self-stacking of conventional MXene electrodes severely restricts their electrochemical performance,especially at high loading.Herein,a flexible cross-linked porous Ti3C2Tx-MXene-reduced graphene oxide(Ti3C2Tx-RGO)film is skillfully designed and synthesized by microscopic explosion of graphene oxide(GO)at sudden high te mperature.The generated chamber structure between layers could hold a few of electrolyte,leading to a close-fitting reaction at interlayer and avoiding complex ions transmission paths.The Ti3C2Tx-RGO film displayed a preferable rate performance than that of pure Ti3C2Tx film and a high capacitance of 505 F/g at 2 mV/s.Furthermore,the uniform intralayer structure and unique energy storage process lead to thicknessindependenct electrochemical performances.This work provides a simple and feasible improvement approach for the design of MXene-based electrodes,which can be spread other electrochemical systems limited by ions transport,such as metal ions batteries and catalysis. 展开更多
关键词 MXene RGO Cross-linked porous Supercapacitors High capacitance Thickness independent
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Determining the sum of flexoelectric coefficients in nematic liquid crystals by the capacitance method 认领 引用 被引量：7
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作者 叶文江 邢红玉 +3 位作者 崔文静 周璇 孙玉宝 张志东 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第11期414-421,共8页
A detailed theoretical analysis of determining the sum of flexoelectric coefficients in nematic liquid crystals using the capacitance method is given. In the strong anchoring parallel aligned nematic （PAN） and hybri... A detailed theoretical analysis of determining the sum of flexoelectric coefficients in nematic liquid crystals using the capacitance method is given. In the strong anchoring parallel aligned nematic （PAN） and hybrid aligned nematic （HAN） cells, the dependences of the capacitance on the sum of flexoelectric coefficients and the applied voltage are obtained by numerical simulations, and the distributions of the director and the electric potential for different applied voltages and flexoelectric coefficients are also given. Based on this theoretical analysis, we propose an experimental design for measuring the capacitance of a liquid crystal cell using the improved precision LCR meter E4980A （Agilent）. Through comparing the experimental data with the simulated results, the sum of flexoeletric coefficients can be determined. 展开更多
关键词 flexoelectricity capacitance parallel aligned nematic and hybrid aligned nematic liquid crystals
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Dynamic Visualization Approach of the Multiphase Flow Using Electrical Capacitance Tomography 认领 引用 被引量：5
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作者 王泽璞 陈琪 +2 位作者 王雪瑶 李志宏 韩振兴 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第2期380-388,共9页
Identifying the flow patterns is vital for understanding the complicated physical mechanisms in multiphase flows.For this purpose,electrical capacitance tomography(ECT) technique is considered as a promising visualiza... Identifying the flow patterns is vital for understanding the complicated physical mechanisms in multiphase flows.For this purpose,electrical capacitance tomography(ECT) technique is considered as a promising visualization method for the flow pattern identification,in which image reconstruction algorithms play an important role.In this paper,a generalized dynamic reconstruction model,which integrates ECT measurement information and physical evolution information of the objects of interest,was presented.A generalized objective functional that simultaneously considers the spatial constraints,temporal constraints and dynamic evolution information of the objects of interest was proposed.Numerical simulations and experiments were implemented to evaluate the feasibility and efficiency of the proposed algorithm.For the cases considered in this paper,the proposed algorithm can well reconstruct the flow patterns,and the quality of the reconstructed images is improved,which indicates that the proposed algorithm is competent to reconstruct the flow patterns in the visualization of multiphase flows. 展开更多
关键词 electrical capacitance tomography visualization flow pattern identification dynamic reconstruction algorithm
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