کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7714676 1497439 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of Ba-deficiency on the phase and structural stability of (BaSr)(CeZr)O3-based proton conducting oxides
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Effect of Ba-deficiency on the phase and structural stability of (BaSr)(CeZr)O3-based proton conducting oxides
چکیده انگلیسی
Deficiency in proton conducting perovskite-type oxides can be strongly influence the fuel cell properties. The effect of barium deficiency on the phase structure, cerium oxidation states, electrical conductivity and phase stability under carbon dioxide atmosphere of proton conducting oxides with composition of (Ba0.6−pSr0.4)(Ce0.75Zr0.10Y0.15)O3−δ (p - barium deficiency; 0.025 ≤ p ≤ 0.20) was systematically investigated. Rietveld refinement of the X-ray diffraction patterns shows the cubic structure in the space group Pm-3m up to p = 0.10. The lattice parameter decreases with 'p' and lie in the range ∼4.358 to ∼4.333 Å. XPS data show the percentage of Ce4+ increases which in turn, reduces the oxygen non-stoichiometry (δ) - values with deficiency (p). Raman spectra show the presence of oxygen vacancies which decreases with 'p'. The conduction behavior depicts the protonic nature with activation energy lying in the range of 0.24-0.29 eV. The stability of deficient compositions (0.025 ≤ p ≤ 0.20) enhances in carbon dioxide (CO2) atmosphere in compare to p = 0.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 40, Issue 34, 14 September 2015, Pages 11022-11031
نویسندگان
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