کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7746516 | 1498286 | 2014 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Tailoring conductivity properties of chemically stable BaIn1 â x â yTixZryO2.5 + (x + y)/2 â n(OH)2n electrolytes for proton conducting fuel cells
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Eight proton conducting oxygen-deficient perovskites BaIn1 â x â yTixZryO2.5 + (x + y)/2 â n(OH)2n with 0.2 â¤Â x + y â¤Â 0.5; 0 â¤Â n â¤Â 0.4 compounds were prepared by solid state reaction at 1350 °C in air and studied by TGA, thermodiffraction, SEM and EIS. At low temperature, below 180 °C, all compounds react with water vapor to incorporate protons. Hydration is associated with highly negative thermodynamic parameters. All the compounds present a disordered cubic symmetry except for the hydrated phases with the highest In content (x + y = 0.2) which present a cubic to tetragonal transformation below 250 °C. Phases are chemically stable towards moisture and 3% CO2 atmosphere in temperature and present thermal expansion properties compatible with standard fuel cell materials. At high temperature the conductivity is mainly anionic (ÏO2- â 0.01 S cmâ 1 at 700 °C) and below 600 °C proton conductivity is observed. The best level of H+ conductivity was found for BaIn0.8Ti0.05Zr0.15O2.6 (at 400 °C, ÏH + = 2 Ã 10â 3 S cmâ 1). For this family of compounds, it is shown that the proton conductivity level at 400 °C is correlated to the basicity and that good protonic conductors at low temperature are also good anionic conductors at high temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 256, 1 March 2014, Pages 76-82
Journal: Solid State Ionics - Volume 256, 1 March 2014, Pages 76-82
نویسندگان
Angélique Jarry, Eric Quarez, Olivier Joubert,