La-doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ as cathode for protonic-conducting solid oxide fuel cells with enhanced structure stability

Yun Xie, Xueyu Hu, Nai Shi, Ranran Peng, Ming Chen, Changrong Xia

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Abstract

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 2.310-3 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.
Original languageEnglish
JournalECS Transactions
Volume103
Issue number1
Pages (from-to)1525-1535
Number of pages11
ISSN1938-5862
DOIs
Publication statusPublished - 2021
Event17th International Symposium on Solid Oxide Fuel Cells - Stockholm, Sweden
Duration: 18 Jul 202123 Jul 2021
Conference number: 17

Conference

Conference17th International Symposium on Solid Oxide Fuel Cells
Number17
Country/TerritorySweden
CityStockholm
Period18/07/202123/07/2021

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