Abstract
AbstractWays 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)O3−δ oxides with multilevel substitutions of tantalum (Ta5+) 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 SrCoO3−δ be stabilized by incorporating Ta5+ at elevated temperatures, but the activity towards ORR can also be significantly enhanced by doping relatively small amounts of Ta5+ (≤20 mol %), which is probably due to the improved oxygen surface exchange that arises from the positive effects of Ta5+ dopants on the oxidation states of cobalt ions.
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