Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7714676 | International Journal of Hydrogen Energy | 2015 | 10 Pages |
Abstract
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 (Ba0.6âpSr0.4)(Ce0.75Zr0.10Y0.15)O3âδ (p - barium deficiency; 0.025 â¤Â p â¤Â 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 â¼4.358 to â¼4.333 Ã
. 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 â¤Â p â¤Â 0.20) enhances in carbon dioxide (CO2) atmosphere in compare to p = 0.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Shivendra Kumar Jaiswal, Sung Min Choi, Kyung Joong Yoon, Ji-Won Son, Byung-Kook Kim, Hae-Weon Lee, Jong-Ho Lee,