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Morphology engineered PtSn/CeO2 catalysts for oxidative dehydrogenation of propane with carbon dioxide 认领 引用
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作者 Chao Peng Guoqing Yang +1 位作者 Hanqing Ge Zhongwen Liu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第7期2106-2118,I0004,共13页
The oxidative dehydrogenation of propane with carbon dioxide(CO2-ODP)has received significant attention as an environmentally benign route for the propene production.However,the development of high-performance cata... The oxidative dehydrogenation of propane with carbon dioxide(CO2-ODP)has received significant attention as an environmentally benign route for the propene production.However,the development of high-performance catalysts remains a critical challenge hindering its industrial implementation.In this work,CeO2 samples with distinct morphologies resembling flowers(F-CeO2),rods(R-CeO2),spindles(SP-CeO2),and sheets(SH-CeO2)were successfully synthesized by simply changing the hydrothermal conditions,and the shape-dependent impact of oxygen-defect contents over CeO2 on the structural and electronic properties of the impregnated PtSn/CeO2 catalysts was studied for CO2-ODP.Characterizations reveal a positive correlation between the Pt electron density and oxygen-defect contents in an increasing order of PtSn/F-CeO2<PtSn/R-CeO2<PtSn/SP-CeO2<PtSn/SH-CeO2.In the case of the catalytic results,the same changing pattern is observed for the initial C3H8 conversion and C3H6selectivity.Moreover,the highest initial propene space-time yield of 0.71 kg_((C3H6))/(kg(cat)·h)achieving over the PtSn/SH-CeO2 catalyst is still retained at 0.35 kg_((C3H6))/(kg(cat)·h)after a time on stream of 200min.This perfo rmance surpasses those of most reported CO2-ODP catalysts.The morphology-dependent catalytic phenomena are attributed mainly to the varied activation energies of CO2-ODP,which are determined by the oxygen defect-induced electronic and structural interplay between Pt,Sn,and CeO2.These findings provide valuable insights for the rational design and optimization of Pt-based catalysts for CO2-ODP,particularly in the selection of oxide supports. 展开更多
关键词 Propane Carbon dioxide Oxidative dehydrogenation Pt CeO2defect Rare earths
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Investigation of Sputtered TiO2Thin Films and Modeling of TiO2-Based Heterojunctions with p-Si and p-GaAs 认领 引用
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作者 Sana Handor Mohamed Manoua +5 位作者 Mohamed Sahlaoui Laura Hrostea Mustapha Adar Mohammed Sajieddine Liviu Leontie Abdelati Razouk 《Energy Engineering》 EI 2026年第9期253-265,共13页
In this study,thin films of titanium dioxide(TiO2)were deposited onto glass and indium tin oxide(ITO)substrates at room temperature,using plasma-assisted pulsed DC sputtering with a 99.9%pure stoichiometric TiO2... In this study,thin films of titanium dioxide(TiO2)were deposited onto glass and indium tin oxide(ITO)substrates at room temperature,using plasma-assisted pulsed DC sputtering with a 99.9%pure stoichiometric TiO2target.Our research aims to investigate the influence of film thickness on the optical,structural,and morphological properties of TiO2nanostructured thin films,as well as its impact on the photovoltaic performance of heterojunctions where TiO2serves as the emitter.Using advanced PRISA software,parameters such as refractive index,film thickness,and band gap energy were determined.Spectrophotometry analysis shows that TiO2thin film samples exhibited up to 90%optical transparency in the UV-Vis spectral region.Using X-ray diffraction(XRD)analysis revealed an amorphous phase,particularly at lower scan angles,while atomic force microscopy(AFM)images show a homogeneous surface of deposited films with low roughness.A notable reduction in the optical band gap was observed with increasing film thickness.Finally,numerical simulations of TiO2/p-Si and TiO2/p-GaAs heterojunction solar cells,performed using Atlas SILVACO software,predict promising photovoltaic performance based on the optical data of the elaborated TiO2thin films. 展开更多
关键词 Titanium dioxide(TiO2) magnetron sputtering(MS) PRISA Atlas SILVACO TiO2based heterojunctions solar cell
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Effect of hydroxyl groups on hydrophilic and photocatalytic activities of rare earth doped titanium dioxide thin films 认领 引用 被引量：7
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作者 杜军 吴其 +6 位作者 钟汕 顾馨 刘娇 郭海志 张文龙 彭海龙 邹建国 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第2期148-153,共6页
Rare earth（Y, La and Nd） doped TiO2 thin films were prepared on glass slides by sol-gel method. The photocatalytic decomposition of methylene blue in aqueous solution was used as a probe reaction to evaluate their p... Rare earth（Y, La and Nd） doped TiO2 thin films were prepared on glass slides by sol-gel method. The photocatalytic decomposition of methylene blue in aqueous solution was used as a probe reaction to evaluate their photocatalytic activities. The effects of hydroxyl groups on hydrophilic and photocatalytic activities were investigated by means of techniques such as X-ray diffraction（XRD）, atomic force microscopy（AFM）, Fourier transform infrared（FTIR）, optical contact angle, UV-Visible spectroscopy and VIS spectroscopy. The results showed that an appropriate doping of rare earth could cause the TiO2 lattice distortion, inhibited phase transition from anatase to rutile, accelerated surface hydroxylation and produced more hydroxyl groups, which resulted in a denser surface and smaller grains（40–60 nm）, and a significant improvement in the hydrophilicity and photoreactivity of TiO2 thin films. The optimal content of rare earth was between 0.1 wt.% and 0.3 wt.%. Moreover, the modification mechanism of rare earth doping was also discussed. 展开更多
关键词 TiO2 rare earth hydroxyl groups hydrophilicity photocatalytic activity
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Engineering an ultrathin amorphous TiO2 layer for boosting the weatherability of TiO2 pigment with high lightening power 认领 引用 被引量：4
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作者 Yangyang Yu Kejing Wu +9 位作者 Shiyu Lu Kui Ma Shan Zhong Hegui Zhang Yingming Zhu Jing Guo Hairong Yue Changjun Liu Siyang Tang Bin Liang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第11期2825-2834,共10页
TiO2 pigments are typically coated with inert layers to suppress the photocatalytic activity and improve the weatherability. However, the traditional inert layers have a lower refractive index compared to TiO2, and th... TiO2 pigments are typically coated with inert layers to suppress the photocatalytic activity and improve the weatherability. However, the traditional inert layers have a lower refractive index compared to TiO2, and therefore reduce the lightening power of TiO2. In the present work, a uniform, amorphous, 2.9-nm-thick TiO2 protective layer was deposited onto the surface of anatase TiO2 pigments according to pulsed chemical vapor deposition at room temperature, with Ti Cl4 as titanium precursor. Amorphous TiO2 coating layers exhibited poor photocatalytic activity, leading to a boosted weatherability. Similarly, this coating method is also effective for TiO2 coating with amorphous SiO2 and SnO2 layers. However, the lightening power of amorphous TiO2 layer is higher than those of amorphous SiO2 and SnO2 layers. According to the measurements of photoluminescence lifetime, surface photocurrent density, charge-transfer resistance, and electron spin resonance spectroscopy, it is revealed that the amorphous layer can prevent the migration of photogenerated electrons and holes onto the surface, decreasing the densities of surface electron and hole, and thereby suppress the photocatalytic activity. 展开更多
关键词 TiO2 pigments Pulsed chemical vapor deposition Ultrathin layer Weatherability Lightening power Photocatalytic suppression mechanism
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High performance perovskite solar cells using TiO2 nanospindles as ultrathin mesoporous layer 认领 引用 被引量：3
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作者 Yinhua Lv Bing Cai +5 位作者 Yihui Wu Shubo Wang Qike Jiang Qingshan Ma JingyueLiu Wen-Hua Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2018年第4期951-956,共6页
Single crystal anatase TiO2 nanospindles （NSs） with highly exposed {101} facets were synthesized and employed as electron transport materials （ETMs） in perovskite solar cells （PSCs）. Time-resolved photoluminesce... Single crystal anatase TiO2 nanospindles （NSs） with highly exposed {101} facets were synthesized and employed as electron transport materials （ETMs） in perovskite solar cells （PSCs）. Time-resolved photoluminescence （TRPL） spectra revealed that the TiO2 NSs are more effective than TiO2 nanoparticles in accepting electrons from perovskite. Moreover. the TiO2 nanospindles further endowed the PSCs with good reproducibility and suppressed hysteresis. The best device with TiO2 NSs as ETMs yielded power conversion efficiency （PCE） of 19.6%, demonstrating that the home-made TiO2 NSs is a good ETM for PSCs. 展开更多
关键词 Electron transport material Perovskite solar cell TiO2 nanospindles Ultrathin mesoporous layer
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Inverted organic solar cells with solvothermal synthesized vanadium-doped TiO2 thin films as efficient electron transport layer 认领 引用 被引量：1
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作者 Mehdi Ahmadi Sajjad Rashidi Dafeh +1 位作者 Samaneh Ghazanfarpour Mohammad Khanzadeh 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第9期406-410,共5页
We investigated the effects of using different thicknesses of pure and vanadium-doped thin films of TiO2 as the electron transport layer in the inverted configuration of organic photovoltaic cells based on poly（3-hex... We investigated the effects of using different thicknesses of pure and vanadium-doped thin films of TiO2 as the electron transport layer in the inverted configuration of organic photovoltaic cells based on poly（3-hexylthiophene） P3HT：[6-6] phenyl-（6） butyric acid methyl ester（PCBM）. 1% vanadium-doped TiO2nanoparticles were synthesized via the solvothermal method. Crystalline structure, morphology, and optical properties of pure and vanadium-doped TiO2 thin films were studied by different techniques such as x-ray diffraction, scanning electron microscopy, transmittance electron microscopy, and UV–visible transmission spectrum. The doctor blade method which is compatible with roll-2-roll printing was used for deposition of pure and vanadium-doped TiO2 thin films with thicknesses of 30 nm and 60 nm. The final results revealed that the best thickness of TiO2 thin films for our fabricated cells was 30 nm. The cell with vanadium-doped TiO2 thin film showed slightly higher power conversion efficiency and great Jsc of 10.7 mA/cm^2 compared with its pure counterpart. In the cells using 60 nm pure and vanadium-doped TiO2 layers, the cell using the doped layer showed much higher efficiency. It is remarkable that the external quantum efficiency of vanadium-doped TiO2 thin film was better in all wavelengths. 展开更多
关键词 inverted polymer solar cells electron transport layer vanadium-doped TiO2 thin films solvothermal
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Stimulation of tight basalt reservoirs using supercritical carbon dioxide: Implications for large-scale carbon sequestration 认领 引用 被引量：1
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作者 Xiufeng Zhang Fengshou Zhang +3 位作者 Xuehang Song Junjie Wei Shuyuan Liu Jiangmei Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第6期3577-3592,共16页
Although supercritical carbon dioxide(SC-CO2)fracturing shows tremendous potential for maximizing injection efficiency and enhancing storage volumes,few investigations have been reported on the SC-CO2 fracturing... Although supercritical carbon dioxide(SC-CO2)fracturing shows tremendous potential for maximizing injection efficiency and enhancing storage volumes,few investigations have been reported on the SC-CO2 fracturing characteristics of tight basalts and the reactions between fractured basalt and SC-CO2.In this study,hydraulic fracturing experiments were conducted on cylindrical basalt specimens using water and SC-CO2 as fracturing fluids.Geometric parameters were proposed to characterize the fracture morphologies based on the three-dimensional(3D)reconstructions of fracture networks.The rock slices with induced fractures after SC-CO2 fracturing were then processed for fluid(deionized water/SC-CO2)-basalt reaction tests.The experimental results demonstrate that SC-CO2 fracturing can induce complex and tortuous fractures with spatially dispersed morphologies.Other fracturing behaviors accompanying the acoustic emission(AE)signals and pump pressure changes show that the AE activity responds almost simultaneously to variation in the pump pressure.The fractured basalt blocks exposed to both SC-CO2 and water exhibit rough and uneven surfaces,along with decreased intensities in the element peaks,indicating that solubility trapping predominantly occurs during the early injection stage.The above findings provide a laboratory research basis for understanding the fracturing and sequestration issues related to effective CO2 utilization. 展开更多
关键词 Basalt Supercritical carbon dioxide(SC-CO2) Hydraulic fracturing Induced fracture Carbon sequestration
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Impact of supercritical carbon dioxide on the frictional strength of and the transport through thin cracks in shale 认领 引用
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作者 Talal Al Shafloot Arjun Kohli +1 位作者 Tae Wook Kim Anthony R.Kovscek 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第12期4990-5003,共14页
Understanding the mechanical and transport behavior of thin(i.e.small aperture)cracks slipping under supercritical carbon dioxide(sc-CO2)conditions is essential to evaluate the integrity of sealing formations with ... Understanding the mechanical and transport behavior of thin(i.e.small aperture)cracks slipping under supercritical carbon dioxide(sc-CO2)conditions is essential to evaluate the integrity of sealing formations with buoyant sc-CO2below and the success of waterless fracturing.The two major items of interest in this work are frictional strength and permeability change of the crack.We used a triaxial cell that permits in situ visualization to conduct and monitor slippage along the faces of narrow cracks subjected to triaxial stresses.Such cracks are analogs to small geological faults.We tested carbonate-rich,1-inch diameter Wolfcamp shale samples that are saw cut 30to vertical to create a thin crack.Friction coefficients ranged from about 0.6 to 0.8 consistent with expectations for brittle rocks.The sc-CO2generally did not alter friction coefficient over the time scale of experiments.From a transport perspective,saturating cracks with sc-CO2substantially decreased permeability of the crack by 26%e52%,while slip resulted in a variety of permeability responses.Overall,the combined impact of sc-CO2saturation and slip reduced fault permeability for all tests.Our observations support the notion that the sealing capacity of some caprocks improves when saturated with sc-CO2and that some slip of small fractures is not necessarily detrimental to caprock integrity. 展开更多
关键词 Supercritical carbon dioxide(sc-CO2) storage Caprock Fracture permeability Friction coefficient
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Two-dimensional ultrathin MoS2-modified black Ti^3+-TiO2 nanotubes for enhanced photocatalytic water splitting hydrogen production 认领 引用 被引量：9
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作者 Wei Ou Jiaqi Pan +7 位作者 Yanyan Liu Shi Li Hongli Li Weijie Zhao Jingjing Wang Changsheng Song Yingying Zheng Chaorong Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第4期188-194,共7页
Two-dimensional (2D) ultrathin MoS2-modified black Ti^3+-TiO2 nanotubes were fabricated using an electrospinning-hydrothermal treatment-reduction method.Bare TiO2 nanotubes were fabricated via electrospinning.Then,2D ... Two-dimensional (2D) ultrathin MoS2-modified black Ti^3+-TiO2 nanotubes were fabricated using an electrospinning-hydrothermal treatment-reduction method.Bare TiO2 nanotubes were fabricated via electrospinning.Then,2D MoS2 lamellae were grown on the surface of the nanotubes and Ti^3+/Ov ions were introduced by reduction.The photocatalytic performance of the 2D MoS2/Ti^3+-TiO2 nanotubes was^15 times better than that of TiO2.The HER enhancement of the MoS2/Ti^3+-TiO2 nanotubes can be attributed to the Pt-like behavior of 2D MoS2 and the presence of Ti^3+-ions,which facilitated the quick diffusion of the photogenerated electrons to water,reducing the H2 activation barrier.The presence of Ov ions in the nanotubes and their hollow structure increased their solar utilization. 展开更多
关键词 2D MoS2 TiO2 nanotubes Ti^3+self-doping Photocatalytic hydrogen production
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Corrosion Behavior of 304LN Stainless Steel in High‑Temperature Supercritical Carbon Dioxide: Oxidation and Carburization 认领 引用
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作者 Nanfu Li Bin Wu +6 位作者 Jiazhen Wang Ming Shu Yusheng Zhang Yifeng Li Jianqiu Wang En‑Hou Han Hongliang Ming 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2025年第10期1809-1826,共18页
The corrosion behavior of 304LN austenitic stainless steel in supercritical CO2 at 650℃ was investigated.The results show that 304LN follows Wagner’s law kinetics,forming a protective oxide flm consisting of SiO_... The corrosion behavior of 304LN austenitic stainless steel in supercritical CO2 at 650℃ was investigated.The results show that 304LN follows Wagner’s law kinetics,forming a protective oxide flm consisting of SiO2,(Cr,Mn)3O4,and Cr2O3 from the inner to outer layers.A shallow carburization depth of approximately 130 nm indicates excellent resistance to carburization.The roles of key elements in 18/8 austenitic stainless steel represented by 304LN,such as Cr,Ni,and Si,were analyzed,highlighting their contributions to anti-carburization performance and corrosion resistance under harsh conditions. 展开更多
关键词 304LN Supercritical carbon dioxide(SC-CO2) Corrosion Transmission electron microscopy(TEM) Carburization
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Electrophoretic Deposition of TiO2/Nb2O5 Composite Electrode Thin Films for Photovoltaic Application 认领 引用 被引量：1
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作者 John Njagi Nguu Bernard Odhiambo Aduda Francis Wanjala Nyongesa Robinson Juma Musembi 《Journal of Energy and Power Engineering》 CAS 2014年第4期757-764,共8页
Nano sized powders of TiO2 （titanium dioxide） and Nb2O5 （Niobium （V） oxide） were used to fabricate TiO2/Nb2O5 composites thin films by EPD （electrophoretic deposition） technique. The metal oxide powders, toget... Nano sized powders of TiO2 （titanium dioxide） and Nb2O5 （Niobium （V） oxide） were used to fabricate TiO2/Nb2O5 composites thin films by EPD （electrophoretic deposition） technique. The metal oxide powders, together with magnesium nitrate hexahydrate pellets, were suspended in propan-2-ol inside an EPD cell. The electrodes, placed 1.2 cm apart, were partially immersed in the suspension and a DC potential applied across them. Key EPD process parameters, which include applied DC electric field, deposition time and solid concentration in suspension, were optimized through visual inspection and from UV-Vis-NIR spectrophotometer spectra. The highest （55%） transmittance was obtained for films with deposition time of 90 s, powder concentration of 0.01 g/40 mL, and 35 V DC （direct current） voltage. XRD micrographs confirmed that TiO2 and Nb2O5 particles were presented in the composite film. SEM （scanning electron microscope） micrographs of the composite electrode thin films showed that porous films of high quality with well controlled morphology were deposited by using the EPD technique. 展开更多
关键词 Electrophoretic deposition TiO2/Nb2O5 composite electrode thin films.
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Effect of Fabrication Process on the Hydrophilic Properties of Porous TiO2 Thin Films for Self-Cleaning Application 认领 引用
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作者 Nguyen Thi Mai Huong Nguyen Thanh Binh +2 位作者 Le Thi Thu Huong Nguyen Dinh Dung Nguyen Trong Tinh 《材料科学与工程（中英文B版）》 2016年第3期126-130,共5页
Self-cleaning effect of nano-TiO2 films have been intensively studied and widely applied in practice. In this report, nano TiO2 materials were prepared from Titanium （IV） Tetraisopropoxide （TTIP） CI2H2804Ti, by so... Self-cleaning effect of nano-TiO2 films have been intensively studied and widely applied in practice. In this report, nano TiO2 materials were prepared from Titanium （IV） Tetraisopropoxide （TTIP） CI2H2804Ti, by sol-gel method and the thin films TiO2 were fabricated by spin coating from TiO2 sol on silicon wafe. The porosity and surface morphology TiO2 thin films has been adjusted by using polyethylene glycol （PEG） at different concentration from 0% to 50%. The prepared nano TiO2 films were mainly characterized by powder X-ray diffraction （XRD）, field emission scanning electron microscopy （FE-SEM）, specific surface area （BET Method） and water contact angle （WCA） measurement. Effects of the addition of PEG on the wetting performance of the resulting films were investigated. The results show that the prepared films display super-hydrophilic property when exposed to ultraviolet light and the optimal concentration of PEG was 40%. Moreover, the obtained films also exhibit considerable durability in the super-hydrophilicity when stored in the dark, which is very useful for self-cleaning application in practice. 展开更多
关键词 Titanium dioxide （TiO2）, water contact angle （WCA）, polyethylene glycol （PEG）, porosity, hydrophilic.
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Determination and Improvement of Deposition Parameters of TiO2 Thin Films via ALD 认领 引用
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作者 Meryem Bozkaya Ismail Kupa +3 位作者 Meryem Polat Gonullu Recep Zan Ali Kemal Okyay Hakan Ates 《材料科学与工程（中英文B版）》 2019年第1期32-40,共9页
In recent years,with the development of technology,interest in microelectronics and thin film devices has increased considerably.Future improvements in microelectronics and thin film devices are dependent on the progr... In recent years,with the development of technology,interest in microelectronics and thin film devices has increased considerably.Future improvements in microelectronics and thin film devices are dependent on the progress of novel materials and new deposition processes.In particular,the continuing drive to some devices such as silicon devices will soon require SiO2 gate and oxide layers with a thickness on the order of a few nanometers as 1 or 2 nm.Titanium dioxide is a candidate material in microelectronic and thin film devices,a wide band gap semiconductor that exhibits various crystal structures.Similarly,thin film techniques like ALD(atomic layer deposition)attract attention for the preparation of these candidate materials with higher film uniformity and conformity.Present study demonstrates how TiO2 thin films were growth by ALD technique on silicon substrates at 100℃,150℃and 200℃temperatures.Different deposition conditions were examined to determine to increase film quality and efficient production of set up.XPS(X-ray photoelectron spectroscopy)technique was used to obtain the surface composition of the TiO2 films.Film thicknesses and crystal structures of the films were investigated by ellipsometry and XRD(X-ray diffraction)methods.Electrical properties of the films were measured by using four probe techniques,as well.Obtained results were evaluated in terms of repeatability of recipes and application potential. 展开更多
关键词 TiO2 films ALD film grown optical properties
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Study of Properties of Lead Selenide (PbSe) Thin Films Deposited on TiO2 认领 引用
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《Journal of Energy and Power Engineering》 CAS 2013年第11期2100-2105,共6页
The study of nano properties of PbSe （lead selenide） thin films deposited on TiO2 semi conductor film prepared by sol gel method was a new work destined to perfect the nano materials used in photovoltaic energy. The... The study of nano properties of PbSe （lead selenide） thin films deposited on TiO2 semi conductor film prepared by sol gel method was a new work destined to perfect the nano materials used in photovoltaic energy. The growth of the first group of the fihns （Set 1： P（9）） ＆ P（14）） was based on the decomposition of lead citrate and sodium selenosulphite in the presence of sodium citrate and sodium hydroxide with ammonia and triethalamine （TEA） acting as the complexing agents and P.H stabilizers; while in the second group （Set 2： Pc15~）, the reaction bath was made up of solutions of lead nitrate Pb（NO3）2, PVA （polyvinyl alcohol）, H20 （distilled water）, NH3 （ammonia）, sodium selenosulphite （Na2SeSO3） and Triethalamine [N（CH2CH2OH）], which was used as the complexing agent. The deposited materials were identified by X-ray diffraction. In addition, nano optical and morphological investigations were also performed. The sample P9 has the lowest absorbance of about 0.3 nm in the ultra-violet region. It was found that there was a reduction in the optical absorbance as the wavelength increases. The optical band gap shows a range of 1.26-2.00 eV with sample PcIs~ having the lowest direct band gap. 展开更多
关键词 Annealing temperature chemical bath technique lead selenide thin films TiO2 semi conductor transmittance nanoproperties.
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Effect of Annealing Temperatures on the Structural and Electrical Properties of Laser Induced Plasma for TiO2x-1Bix Thin Films 认领 引用
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作者 Sabah N. Mazhir Ghuson H. Mohamed +1 位作者 Kadhim A. Aadem Maysoon D. Radhi 《Journal of Physical Science and Application》 2016年第1期36-43,共8页
In this study, Bismuth doped Titanium dioxide thin films were deposited on glass substrates by a pulse laser deposition using laser. The effect of annealing temperature on the structural and electrical properties was ... In this study, Bismuth doped Titanium dioxide thin films were deposited on glass substrates by a pulse laser deposition using laser. The effect of annealing temperature on the structural and electrical properties was investigated. X-ray diffraction pattern for pure and doped titanium dioxide films with different doping different ratio with Bi show that these films have amorphous structure oanvert to polycrystalline structure with annealing and doping and have a good identically with standard peaks for Anatase and Rutile phases. The orientation was at specific direction for Rutile. The crystalline of films increases by the increase of doping ratio. The crystalline increased with annealing temperature. Annealed films at different annealing temperatures have been studied. The results show that these films have two activation energies and by increasing the doping ratio, the activation energies and the conductivity increase. Both the annealing and composition effects on Hall constant, density of electron carders and Hall mobility are studied. Hall Effect measurements show that all films have n- type charge conductivity and the concentration increases while the mobility decreases with doping and annealing. 展开更多
关键词 Electrical properties structural properties TiO2 thin films pulse laser deposition technique.
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XRD and XPS Analysis of TiO2 Thin Films Annealed in Different Environments 认领 引用
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作者 Tamara Potlog Petru Dumitriu +1 位作者 Marius Dobromir Dumitru Luca 《材料科学与工程（中英文B版）》 2014年第6期163-170,共8页
Undoped and Nb-doped TiO2 thin films have been fabricated on glass substrate by RF magnetron sputtering. The morphologic, structural and surface composition of these films before and after annealing in different envir... Undoped and Nb-doped TiO2 thin films have been fabricated on glass substrate by RF magnetron sputtering. The morphologic, structural and surface composition of these films before and after annealing in different environments were investigated by atomic force microscopy （AFM） imaging, X-ray diffraction （XRD） and X-ray photoelectron spectroscopy （XPS）. The XRD data reveal that the crystallinity is improved when the films are Nb-doped and annealed in H2 environment. The TiO2 thin films annealed in H2 environment exhibit only the anatase phase. The XPS analysis of TiO2 with Nb indicates the maximum shift in binding energy of the Ti 2p peak. A mechanism for the incorporation of Nb in the TiO2 lattice has been proposed. 展开更多
关键词 TiO2薄膜 XPS分析 XRD 环境 退火 X射线光电子能谱 X射线衍射 原子力显微镜
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ScCO2作用下含水性对煤化学组成和结构的影响 认领 引用 被引量：3
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作者 张小东 孙泽源 +3 位作者 张瑜 张硕 李勇 杜志刚 《煤炭学报》 EI CAS CSCD 北大核心 2026年第1期678-688,共11页
深部煤层封存CO2过程中,CO2常处于超临界状态(ScCO2),与水、煤存在复杂的物理化学反应,促使煤的化学组成和结构发生变化,进而影响CO2地质封存的效果。为研究不同含水条件下ScCO2对煤化学组成和结构的影响,以焦煤为研究对... 深部煤层封存CO2过程中,CO2常处于超临界状态(ScCO2),与水、煤存在复杂的物理化学反应,促使煤的化学组成和结构发生变化,进而影响CO2地质封存的效果。为研究不同含水条件下ScCO2对煤化学组成和结构的影响,以焦煤为研究对象,开展了不同含水率下ScCO2-煤反应试验,对比反应前后煤的化学组成和结构的差异,探讨含水性对ScCO2-煤反应的影响机制。结果表明:ScCO2对煤中碳酸盐矿物溶解性较强,其次是黏土矿物,随含水率增大,反应残余煤中碳酸盐矿物的质量分数先增后减;较大含水率时,ScCO2与煤中碳酸盐矿物的反应强于黏土矿物,故碳酸盐矿物减少更为显著。ScCO2与H2O对煤化学结构中含氧官能团的影响较大,而对芳香烃、脂肪烃的影响较小;ScCO2导致煤中含氧官能团含量降低,随水分增加,富氧指数(I2)显著增大,而富氢指数(I1)、芳香度(I3)和缩聚度(I4)变化较小。ScCO2的溶胀作用,使芳香层间距(d002)增大,同时延展度(La)、芳香层数(Nc)、芳碳率(fa')和脂碳率(fal)均减小;随水分增加,d002、La和fa'先增后减,Lc、Nc和fal的变化趋势则相反。水分在一定程度上可提升ScCO2对煤低分子化合物的萃取效果,促进煤芳香结构无序化,但随水分含量进一步增大,水分将会阻止CO2进入煤体,煤中碳酸盐矿物先一步与ScCO2反应,进而弱化ScCO2对煤有机质的萃取效应,表现为空气干燥基态时ScCO2对煤有机质的溶出量和化学结构破坏的影响更明显,饱水态时矿物质的溶蚀更显著。 展开更多
关键词 煤 ScCO2 含水率 矿物组成 官能团 化学结构
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Optimization of Spectral and Angular Selectivity in Obliquely Deposited TiO2/Ag/TiO2 Thin Films Prepared by Thermal Evaporation and Sputtering Methods 认领 引用
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作者 Haji Faki Haji Nuru Ramadhani Mlyuka 《材料科学与工程（中英文B版）》 2015年第5期206-221,共16页
Optical properties of obliquely deposited TiO2/Ag/TiO2 multilayered films prepared by thermal evaporation and sputtering methods were investigated for energy efficiency of architectural and automobile windows. Investi... Optical properties of obliquely deposited TiO2/Ag/TiO2 multilayered films prepared by thermal evaporation and sputtering methods were investigated for energy efficiency of architectural and automobile windows. Investigation on the influency of layer thickness on the properties of TiO2/Ag/TiO2 films yield an optimum layer thickness of 5 nm/14 nm/5 nm and 10 nm/14 nm/10 nm for optimal solar control performance of TiO2/Ag/TiO2 films deposited by sputtering and thermal evaporation methods. The optimum films were then obliquely deposited with deposition angle varying from 0° to 70° for the purpose of optimizing angular selectivity of the films. The spectral transmittances were measured by HITACHI model U-2000 double beam UV-VIS-Spectrophotometer. The optimum thickness provided a peak transmittance of 70% at a wavelength of 400 nm for near normal thermally evaporated thin films, and 72% for films deposited by sputtering unit at - 320 ℃ for TiO2 layers. Influence of deposition angle for obliquely deposited thin films was investigated for both sputtered and thermal evaporated thin films. The transmittance values for the films deposited by both methods gradually increased with increasing deposition angles to a peak of 80% at 400 nm wavelength. The angular transmittance measurements were taken for the optimum films with 10 rim/14 rim/10 nm thicknesses due to relatively larger overall film thickness as compared to 5 nm/14 nm/5 nm. Films deposited at 30°, 40°and 60°, with incident light angle of± 10°, ± 30°, ± 50° and ± 70°were used for transmittance measurements. Best angular performance of 7% was realized at ± 10° light incidence angle for films prepared at 60° deposition angle. 展开更多
关键词 Ag/TiO2薄膜 溅射沉积 热蒸发 双光束紫外可见分光光度计 优化 制备 光谱透射率 薄膜性能
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中国水泥行业污染物与二氧化碳排放清单及分布特征 认领 引用 被引量：2
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作者 李朋 吕松 +3 位作者 白孝轩 李超 周卫青 屈加豹 《环境科学》 EI CAS CSCD 北大核心 2026年第5期2860-2869,共10页
水泥行业是空气污染物和二氧化碳(CO2)排放的主要来源之一.为减少其排放,中国实施了一系列大气污染物防治和节能降碳措施,显著改变了水泥行业污染物和温室气体排放特征.基于2023年全国水泥行业在线监测和排污许可数据,自下而上编制... 水泥行业是空气污染物和二氧化碳(CO2)排放的主要来源之一.为减少其排放,中国实施了一系列大气污染物防治和节能降碳措施,显著改变了水泥行业污染物和温室气体排放特征.基于2023年全国水泥行业在线监测和排污许可数据,自下而上编制了中国水泥行业高时空分辨率的大气污染物(PM、SO2和NOx)和CO2排放清单.结果表明,2023年中国水泥行业的PM、SO2、NOx和CO2排放量分别为2.48×104、3.95×104、45.86×104和100072.97×104t,其中广西、广东和云南是大气污染物排放热点省域,而安徽、广东和四川是CO2排放热点省域.从时间维度来看,近年来中国水泥行业大气污染排放控制政策成效显著,2023年,中国水泥行业ρ(窑头PM)、ρ(窑尾PM)、ρ(SO2)和ρ(NOx)年均值分别为4.41、4.70、11.67和139.16 mg·m-3,较2018年分别下降55.91%、65.52%、51.31%和39.15%.从区域维度来看,各省域间排放浓度存在显著差异,其中东部和北部等地区低于全国平均水平.从污染物维度来看,PM和SO2已基本提前满足超低排放标准限值,但NOx仍需进一步加强管控.研究所构建的排放清单可为中国水泥行业的污染物和CO2协同管控政策制定提供数据支撑. 展开更多
关键词 水泥行业 排放清单 大气污染物 二氧化碳(CO2) 排放浓度 排放因子
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重点行业碳捕集技术应用现状、挑战与对策 认领 引用 被引量：1
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作者 王乐萌 郝玉婷 +8 位作者 刘铮 张敬巧 赵若楠 李旭华 朱瑶 曹婷 吕海洋 王博瑞 王涵 《环境工程技术学报》 CAS CSCD 北大核心 2026年第2期591-601,共11页
碳捕集是目前实现大规模温室气体减排的重要技术手段,是电力、钢铁、水泥、化工等重点行业深度脱碳的可行技术方案。碳捕集的主流技术包括化学吸收法、固体吸附法、膜分离法以及全氧燃烧技术,已在多个领域展开应用。目前,化学吸收法应... 碳捕集是目前实现大规模温室气体减排的重要技术手段,是电力、钢铁、水泥、化工等重点行业深度脱碳的可行技术方案。碳捕集的主流技术包括化学吸收法、固体吸附法、膜分离法以及全氧燃烧技术,已在多个领域展开应用。目前,化学吸收法应用最广泛,适用于电力、石油化工、钢铁等多个行业。此外,针对行业中不同CO2浓度捕集问题,压缩液化-低温精馏及化学吸收-固体吸附耦合方法分别用于石油化工和钢铁行业。总体来看,当前重点行业碳捕集技术面临的主要问题包括投资运行成本高,吸收剂性能有待提升,不同行业中碳捕集技术的应用场景有所差异等。针对这些关键问题,应加快研发新型高效吸收剂与智能配胺技术,以大幅降低再生能耗并提升对烟气波动的适应性;同时,需开发高通量、低能耗的核心设备内构件,以缩小设备体积、降低运行成本,从而驱动百万吨级项目的规模化应用。 展开更多
关键词 重点行业 二氧化碳 碳捕集 运行成本 提升路径
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