Developing a heterostructure for alloying-based anode for sodium-ion batteries(SIBs)is an efficient solution to accommodate volume change upon sodiation/desodiation and boost sodium storage since it combines the merit...Developing a heterostructure for alloying-based anode for sodium-ion batteries(SIBs)is an efficient solution to accommodate volume change upon sodiation/desodiation and boost sodium storage since it combines the merits of each component.Herein,we report a metallic and microphone-like Sn-Zn0.9Mn0.1O heterostructure via an in-situ Mn doping strategy.Based on theoretical calculations and experimental results,the introduction of Mn into Zn O(a small amount of Mn also diffuses into the Sn lattice)can not only enhance intrinsic electronic conductivity but also reduce the Na+diffusion barrier inside the Sn phase.When evaluated as anode for SIBs,the obtained heterostructures show a high reversible capacity of 395.1 mAh/g at 0.1 A/g,rate capability of 332 mAh/g at 5 A/g,and capacity retention of almost 100%after 850 cycles at 5 A/g,indicating its great potential for high-power application of SIBs.展开更多
The humidity sensing properties of La^3+ and K^+ co-doped Ti0.9Sn0.1O2 thin films were investigated. The humidity sensitive thin films were prepared by sol-gel method on alumina substrates. The sensing behaviors of ...The humidity sensing properties of La^3+ and K^+ co-doped Ti0.9Sn0.1O2 thin films were investigated. The humidity sensitive thin films were prepared by sol-gel method on alumina substrates. The sensing behaviors of thin films were inspected at different sintering temperatures by constructing a humidity-impedance measuring system. It was found that the addition of rare earth ion La^3+ and alkali ion K^+ was beneficial for improving the humidity sensitive properties of the samples and La0.003K0.5Ti0.9Sn0.1O2 sintered at 500 ℃ for 4 h showed the best humidity sensing properties. The impedance of this thin film decreased from 109 to 104 Ω with excellent linearity in the humidity range of 11%-95%. Narrow hysteresis loop, prominent stability and high sensitivity were obtained. The effects of dopant con-tent and doping mechanism on humidity sensitivity were also discussed in terms of segregation of rare earth ions at grain boundaries and granularity of crystalline and influence of K^+ on the decrease in the intrinsic resistance of the materials, and increase in the number of wa-ter adsorption sites.展开更多
A novel and effective BiOCl0.9I0.1/x%β-Bi2O3 composite catalyst was synthesized through a precipitation method. The structure, morphology, and optical properties of the samples were certified by X-ray diffraction, UV...A novel and effective BiOCl0.9I0.1/x%β-Bi2O3 composite catalyst was synthesized through a precipitation method. The structure, morphology, and optical properties of the samples were certified by X-ray diffraction, UV-Vis diffuse reflectance, scanning electron microscopy, and X-ray photoelectron spectroscopic characterizations. Photocatalytic experiments demonstrated that the synthesized BiOCl0.9I0.1/x%β-Bi2O3 composite catalyst exhibited excellent photocatalytic performance toward the degradation of tetracycline hydrochloride(TCH) under simulated sunlight. Furthermore, the TCH degradation rate of BiOCl0.9I0.1/15%β-Bi2O3 increased by 27.6% and 61.4% compared with those of the pure BiOCl0.9I0.1 and pure β-Bi2O3, respectively. Due to the multiple vacancies and valence states possessed by BiOCl0.9I0.1/x%β-Bi2O3, namely Bi5+, Bi(3-x)+, Bi5+–O, Bi3+–O, I- and I3-, the charge separation in photocatalysis reactions can be effectively promoted. The Mott-Schottky measurements indicate that the conduction band(CB) level of BiOCl0.9I0.1/15%β-Bi2O3 becomes more negative relative to that of BiOCl0.9I0.1, guaranteeing an advantageous effect on the redox ability of the photocatalyst. This study provides a new bright spot for the construction of high-performance photocatalysts.展开更多
A new method for increasing the three phase boundaries in anode of SOFC is reported. The results of the study show that the three phase boundaries in the SOFC anode Ni+YSZ are greatly increased by doping Ce 0.9 Ca 0.1...A new method for increasing the three phase boundaries in anode of SOFC is reported. The results of the study show that the three phase boundaries in the SOFC anode Ni+YSZ are greatly increased by doping Ce 0.9 Ca 0.1 O 2- δ particles , and the transportation of oxygen ion in the anode is improved as well. By adding Ce 0.9 Ca 0.1 O 2- δ particles, the composite anode is produced and the anode reaction is accelerated, resulting in an improvement of SOFC output properties. The highest power density of SOFC with the anode of Ni+YSZ doped by Ce 0.9 Ca 0.1 O 2- δ particles in a weight ratio of 15%, which is about 3 times higher than that of SOFC with the anode Ni+YSZ without doping, is obtained. [WT5HZ]展开更多
采用共沉淀-高温固相法制备出Ni-Mn固溶的LiNi0.9Mn0.1O_2正极材料,并对材料进行ZrO_2掺杂改性,提高其性能。结合X-射线衍射(XRD)、扫描电镜(SEM)、电化学性能测试分析对LiNi0.9Mn0.1O_2材料性能进行表征。研究表明:掺杂能...采用共沉淀-高温固相法制备出Ni-Mn固溶的LiNi0.9Mn0.1O_2正极材料,并对材料进行ZrO_2掺杂改性,提高其性能。结合X-射线衍射(XRD)、扫描电镜(SEM)、电化学性能测试分析对LiNi0.9Mn0.1O_2材料性能进行表征。研究表明:掺杂能改善材料的电化学性能,ZrO_2掺杂量为1.5%,在25℃、2.75~4.35 V下,材料的首次放电比容量为199.8 m Ah/g,循环50次后,容量保持率为89.79%,在-20℃低温下,放电效率为71.68%。同时分析了材料内阻随放电深度的变化,确定材料电化学阻抗值的变化规律。展开更多
采用溶胶-凝胶法制备Ti/Sn O_2-F电极,进行全氟辛酸(PFOA)电氧化降解的研究,实验考察了F替代Sb掺杂、电流密度、初始pH值和支持电解质对PFOA降解效率的影响。结果表明,当F替代Sb掺杂Sn O_2,电流密度为20 m A/cm^2,初始pH值3.7,支持电解...采用溶胶-凝胶法制备Ti/Sn O_2-F电极,进行全氟辛酸(PFOA)电氧化降解的研究,实验考察了F替代Sb掺杂、电流密度、初始pH值和支持电解质对PFOA降解效率的影响。结果表明,当F替代Sb掺杂Sn O_2,电流密度为20 m A/cm^2,初始pH值3.7,支持电解质为NaClO_4时,电解30 min后PFOA的降解率达98%。采用液相色谱-质谱联用(HPLC-MS/MS)和离子色谱(IC)对PFOA降解产物进行分析,解析了PFOA电氧化降解的反应机理。展开更多
Heterogeneous composite BaZr0.9Y0.1O2.95/Na2SO4 was designed and fabricated with Y-doped BaZrO3 as matrix and Na2SO4 as dispersant by conventional powder processing to improve the total conductivity of barium zirconat...Heterogeneous composite BaZr0.9Y0.1O2.95/Na2SO4 was designed and fabricated with Y-doped BaZrO3 as matrix and Na2SO4 as dispersant by conventional powder processing to improve the total conductivity of barium zirconate.The electrical conduction of the composite was studied by electrical and electrochemical methods.Microstructure of the heterogeneous composite was examined by SEM.The experimewtal results show that the protonic conductivity of Y-doped BaZrO3 is greatly improved upon incorporating Na2SO4 in the material.Microstructure observation indicates that a multiphase structure with Na2SO4 disperses at the grain boundaries of BaZr0.1Y0.9O2.95.Electromotive force(EMF)measurements under fuel cell conditions reveal that the total ionic transport number of the composite is more than 0.9 at 750℃.展开更多
基金financially supported by the National Natural Science Foundation of China(No.52072119)Hunan Provincial Natural Science Foundation(No.2023JJ50015)the 111 Project(No.D20015)。
摘要Developing a heterostructure for alloying-based anode for sodium-ion batteries(SIBs)is an efficient solution to accommodate volume change upon sodiation/desodiation and boost sodium storage since it combines the merits of each component.Herein,we report a metallic and microphone-like Sn-Zn0.9Mn0.1O heterostructure via an in-situ Mn doping strategy.Based on theoretical calculations and experimental results,the introduction of Mn into Zn O(a small amount of Mn also diffuses into the Sn lattice)can not only enhance intrinsic electronic conductivity but also reduce the Na+diffusion barrier inside the Sn phase.When evaluated as anode for SIBs,the obtained heterostructures show a high reversible capacity of 395.1 mAh/g at 0.1 A/g,rate capability of 332 mAh/g at 5 A/g,and capacity retention of almost 100%after 850 cycles at 5 A/g,indicating its great potential for high-power application of SIBs.
摘要The humidity sensing properties of La^3+ and K^+ co-doped Ti0.9Sn0.1O2 thin films were investigated. The humidity sensitive thin films were prepared by sol-gel method on alumina substrates. The sensing behaviors of thin films were inspected at different sintering temperatures by constructing a humidity-impedance measuring system. It was found that the addition of rare earth ion La^3+ and alkali ion K^+ was beneficial for improving the humidity sensitive properties of the samples and La0.003K0.5Ti0.9Sn0.1O2 sintered at 500 ℃ for 4 h showed the best humidity sensing properties. The impedance of this thin film decreased from 109 to 104 Ω with excellent linearity in the humidity range of 11%-95%. Narrow hysteresis loop, prominent stability and high sensitivity were obtained. The effects of dopant con-tent and doping mechanism on humidity sensitivity were also discussed in terms of segregation of rare earth ions at grain boundaries and granularity of crystalline and influence of K^+ on the decrease in the intrinsic resistance of the materials, and increase in the number of wa-ter adsorption sites.
摘要A novel and effective BiOCl0.9I0.1/x%β-Bi2O3 composite catalyst was synthesized through a precipitation method. The structure, morphology, and optical properties of the samples were certified by X-ray diffraction, UV-Vis diffuse reflectance, scanning electron microscopy, and X-ray photoelectron spectroscopic characterizations. Photocatalytic experiments demonstrated that the synthesized BiOCl0.9I0.1/x%β-Bi2O3 composite catalyst exhibited excellent photocatalytic performance toward the degradation of tetracycline hydrochloride(TCH) under simulated sunlight. Furthermore, the TCH degradation rate of BiOCl0.9I0.1/15%β-Bi2O3 increased by 27.6% and 61.4% compared with those of the pure BiOCl0.9I0.1 and pure β-Bi2O3, respectively. Due to the multiple vacancies and valence states possessed by BiOCl0.9I0.1/x%β-Bi2O3, namely Bi5+, Bi(3-x)+, Bi5+–O, Bi3+–O, I- and I3-, the charge separation in photocatalysis reactions can be effectively promoted. The Mott-Schottky measurements indicate that the conduction band(CB) level of BiOCl0.9I0.1/15%β-Bi2O3 becomes more negative relative to that of BiOCl0.9I0.1, guaranteeing an advantageous effect on the redox ability of the photocatalyst. This study provides a new bright spot for the construction of high-performance photocatalysts.
摘要A new method for increasing the three phase boundaries in anode of SOFC is reported. The results of the study show that the three phase boundaries in the SOFC anode Ni+YSZ are greatly increased by doping Ce 0.9 Ca 0.1 O 2- δ particles , and the transportation of oxygen ion in the anode is improved as well. By adding Ce 0.9 Ca 0.1 O 2- δ particles, the composite anode is produced and the anode reaction is accelerated, resulting in an improvement of SOFC output properties. The highest power density of SOFC with the anode of Ni+YSZ doped by Ce 0.9 Ca 0.1 O 2- δ particles in a weight ratio of 15%, which is about 3 times higher than that of SOFC with the anode Ni+YSZ without doping, is obtained. [WT5HZ]
摘要采用共沉淀-高温固相法制备出Ni-Mn固溶的LiNi0.9Mn0.1O_2正极材料,并对材料进行ZrO_2掺杂改性,提高其性能。结合X-射线衍射(XRD)、扫描电镜(SEM)、电化学性能测试分析对LiNi0.9Mn0.1O_2材料性能进行表征。研究表明:掺杂能改善材料的电化学性能,ZrO_2掺杂量为1.5%,在25℃、2.75~4.35 V下,材料的首次放电比容量为199.8 m Ah/g,循环50次后,容量保持率为89.79%,在-20℃低温下,放电效率为71.68%。同时分析了材料内阻随放电深度的变化,确定材料电化学阻抗值的变化规律。
基金Funded by the National Natural Science Foundation of China(No.50872090)
摘要Heterogeneous composite BaZr0.9Y0.1O2.95/Na2SO4 was designed and fabricated with Y-doped BaZrO3 as matrix and Na2SO4 as dispersant by conventional powder processing to improve the total conductivity of barium zirconate.The electrical conduction of the composite was studied by electrical and electrochemical methods.Microstructure of the heterogeneous composite was examined by SEM.The experimewtal results show that the protonic conductivity of Y-doped BaZrO3 is greatly improved upon incorporating Na2SO4 in the material.Microstructure observation indicates that a multiphase structure with Na2SO4 disperses at the grain boundaries of BaZr0.1Y0.9O2.95.Electromotive force(EMF)measurements under fuel cell conditions reveal that the total ionic transport number of the composite is more than 0.9 at 750℃.