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Comparative Studies of SrCo 1− x Ta x O 3− δ ( x =0.05–0.4) Oxides as Cathodes for Low‐Temperature Solid‐Oxide Fuel Cells
Author(s) -
Li Mengran,
Zhou Wei,
Zhu Zhonghua
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500157
Subject(s) - tantalum , electrochemistry , cathode , materials science , crystallite , doping , oxide , inorganic chemistry , crystal structure , dopant , cobalt , chemistry , electrode , crystallography , metallurgy , optoelectronics
Ways to address the sluggish ORR kinetics of cathodes have become an area of great interest and significance for the deployment of solid‐oxide fuel cells (SOFCs) that operate at lower temperatures. A series of Sr(Co,Ta)O 3− δ oxides with multilevel substitutions of tantalum (Ta 5+ ) ions have been studied as cathodes for SOFCs in terms of their crystal structures, electrochemical properties, and durability. The effects of doping tantalum on the oxygen reduction reaction (ORR) have been explored and discussed. Not only can the crystallite structure of SrCoO 3− δ be stabilized by incorporating Ta 5+ at elevated temperatures, but the activity towards ORR can also be significantly enhanced by doping relatively small amounts of Ta 5+ (≤20 mol %), which is probably due to the improved oxygen surface exchange that arises from the positive effects of Ta 5+ dopants on the oxidation states of cobalt ions.