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Proton transport in unsintered BaCe_(0.8)Y_(0.2)O_(3-α) for easily prepared electrochemical devices

Journal of Rare Earths 2025年第1期43卷 133-145,I0006页

作者： Xi Wang Yushi Ding Ying Li Gaopeng Zhou Wenlong Huang Liaoning Key Laboratory for Metallurgical Sensor Material and Technology School of MetallurgyNortheastern UniversityShenyang110819China

BaCe_(0.8)Y_(0.2)O_(3)-αceramics exhibit superior conductivity among related ***,the hightemperature sintering makes it difficult to prepare electrochemical devices with a BaCe_(0.8)Y_(0.2)O_(3)-αmultilayer film,and very few studies have examined the conductivity and transport properties of unsintered BaCe_(0.8)Y_(0.2)O_(3)-α.In nominally dry conditions,the instability of this material in a watercontaining atmosphere can be minimized,allowing the unsintered BaCe_(0.8)Y_(0.2)O_(3)-αto be applied in some particular test environment as a component of electrochemical ***,the conductivity of unsintered BaCe_(0.8)Y_(0.2)O_(3)-αin dry conditions was measured via AC impedance spectroscopy in the temperature range of 500-800℃.The unsintered BaCe_(0.8)Y_(0.2)O_(3)-αexhibits high conductivity and hydration ability,as well as low proton activation *** addition,it shows high oxygen vacancy and low proton transport numbers at high temperature,limited by its grain *** work provides insights into the conductivity and proton transport of unsintered BaCe_(0.8)Y_(0.2)O_(3)-αand demonstrates its potential as a proton-conducting electrolyte.

关键词： protonic conductor Unsintered material BaCe_(0.8)Y_(0.2)0^(3-α) Conductivity Transport number Rare earths

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Effects of Sc doping on electrical conductivity of BaZrO_3 protonic conductors

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Rare Metals 2012年第1期31卷 71-74页

作者： Guo, Ruisong Wu, Lijun Ren, Jianxun Zhang, Jianfang Jiang, Hong Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Educatton Tianjin University Tianjin 300072 China No.53 Institute of China Ordnance Industry Group Jinan 250031 China Guizhou Broadcasting and Television College Guiyang 550004 China

BaZr1-xScxO3-0.5x (x=0.07,0.10,0.13,0.16) powders were prepared by solid-state reaction method,and ZnO was used as sintering *** with different amount of ZnO additive were sintered at 1450·C for 6 h in *** cubic perovskite phase proton conductors were *** was measured by electrochemical *** was shown that Sc doping could increase conductivity through enhancing the carrier concentration in the material,but excessive Sc content might decrease the carrier concentration because of its charge *** had an influence on carrier concentration and mobility and affected the electrical conductivity.2 mol% ZnO and 13 mol% ScO1.5 doped sample showed the highest DC conductivity of 3.6×10-3 S·cm-1 tested at 800·C in wet hydrogen atmosphere.

关键词： protonic conductor perovskite carrier concentration mobility

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Properties and Application of Ceramic BaCe0.8Ho0.2O3-α

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Chinese Journal of Chemistry 2005年第12期23卷 1641-1645页

作者：仇立干马桂林闻荻江 School of Chemistry and Chemical Engineering Suzhou University Jiangsu Suzhou 215123 China Department of Chemistry Yancheng Teacher College Jiangsu Yancheng 224002 China School of Material Engineering Suzhou University Jiangsu Suzhou 215006 China

Ceramic BaCe0.8Ho0.2O3-α with orthorhombic perovskite structure was prepared by conventional solid state reaction, and its conductivity and ionic transport number were measured by ac impedance spectroscopy and gas concentration cell methods in the temperature range of 600-1000 ℃ in wet hydrogen and wet air, respectively. Using the ceramics as solid electrolyte and porous platinum as electrodes, the hydrogen-air fuel cell was constructed, and the cell performance at temperature from 600-1000 ℃ was examined. The results indicate that the specimen was a pure protonic conductor with the protonic transport number of 1 at temperature from 600-900 ℃ in wet hydrogen, a mixed conductor of proton and electron with the protonic transport number of 0.99 at 1000 ℃. The electronic conduction could be neglected in this case, thus the total conductivity in wet hydrogen was approximately regarded as protonic conductivity. In wet air, the specimen was a mixed conductor of proton, oxide ion and electron hole. The protonic transport numbers were 0.01-0.09, and the oxide-ionic transport numbers were 0.27-0.32. The oxide ionic conductivity was increased with the increase of temperature, but the protonic conductivity displayed a maximum at 900 ℃, due to the combined increase in mobility and depletion of the carriers. The fuel cell could work stably. At 1000 ℃, the maximum short-circuit current density and power output density were 346 mA/cm^2 and 80 mW/cm^2, respectively.

关键词： BaCe0.8Ho0.2O3-α ac impedance gas concentration cell fuel cell protonic conductor

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