標題: Characterization and electrochemical properties of chromium-substituted pyrochlore Y2Ti2-x Cr (x) O7-delta
作者: Hao, Chia-Kan
Hung, Hao-En
Lee, Chi-Shen
應用化學系
Department of Applied Chemistry
關鍵字: SOFC;Pyrochlore;Chromium-substituted;Y2Ti2O7;Ionic conductivity;Electrical conductivity
公開日期: 1-Nov-2015
摘要: Pyrochlore oxides Y2Ti2-x Cr (x) O7-delta have been investigated as electrolyte for solid oxide fuel cell. The as-prepared powder was synthesized by sol-gel method and characterized by powder X-ray diffraction, scanning electron microscope/energy-dispersive spectroscopy, inductively coupled plasma atomic emission spectroscopy, temperature-programmed reduction and AC impedance. Y2Ti2-x Cr (x) O7-delta existed in single phase in a range of 0 < x a parts per thousand currency sign 0.8, and the cell parameters decreased as the amount of Cr dopant increased. XPS analyses indicate that the average oxidation state of Cr (n+) ions decreased with the increased Cr content. Measurements of ionic conductivities induced that the optimized performance was observed at x = 0.2 with 0.01 S/cm at 700 A degrees C due to an optimized condition of carrier concentration and carrier mobility. Y2Ti2-x Cr (x) O7-delta existed in single phase in a range of 0 < x a parts per thousand currency sign 0.8 and the optimized performance of ionic conductivity was observed at x = 0.2 with 0.01 S/cm at 700 A degrees C. [GRAPHICS] .
URI: http://dx.doi.org/10.1007/s10971-015-3791-4
http://hdl.handle.net/11536/128117
ISSN: 0928-0707
DOI: 10.1007/s10971-015-3791-4
期刊: JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume: 76
起始頁: 428
結束頁: 435
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