Journal article · Conference paper
La-doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ as cathode for protonic-conducting solid oxide fuel cells with enhanced structure stability
As a highly efficient energy conversion device, proton-conducting solid oxide fuel cells (PCFCs) have attracted intensive attention. Unfortunately, its practical application is limited by the catalytic activity and stability of the cathode. Here, we report a novel electrochemical catalyst of 10 mol.% La modified Ba0.5Sr0.5Co0.8Fe0.2O3-d cathode, showing much improved stability under typical PCFCs working conditions.
XRD patterns confirm that La0.1Ba0.4Sr0.5Co0.8Fe0.2O3-d maintains cubic structure after treated in humid air or 10% H2O - 90% N2. In addition, La0.1Ba0.4Sr0.5Co0.8Fe0.2O3-d also demonstrates outstanding oxygen transport properties with a chemical surface exchange coefficient of 2.3∗10-3 cm s-1 at 700 °C, and the assembled single cells using this novel material present a minimal polarization resistance of 0.05 W cm2 at 700 °C.
The high stability and great electrochemical performance of La0.1Ba0.4Sr0.5Co0.8Fe0.2O3-d may result from the stronger interaction in the La-O bond than in Ba-O. This work provides a strategy to modify materials properties via optimizing the interaction between metal and oxygen ions in the oxide lattice.
Language: | English |
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Year: | 2021 |
Pages: | 1525-1535 |
Proceedings: | 17th International Symposium on Solid Oxide Fuel Cells |
ISSN: | 19386737 and 19385862 |
Types: | Journal article and Conference paper |
DOI: | 10.1149/10301.1525ecst |
ORCIDs: | Xie, Yun and Chen, Ming |