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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

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-? cathode, showing much improved stability under typical PCFCs working conditions. XRD patterns confirm that La0.1Ba0.4Sr0.5Co0.8Fe0.2O3-? maintains cubic structure after treated in humid air or 10% H2O - 90% N2. In addition, La0.1Ba0.4Sr0.5Co0.8Fe0.2O3-? 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 ? cm2 at 700 ?C. The high stability and great electrochemical performance of La0.1Ba0.4Sr0.5Co0.8Fe0.2O3-? 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
Title of host publication17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021
PublisherIOP Publishing Ltd.
Pages1525-1535
Number of pages11
Edition1
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2021
Event17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021 - Stockholm, Sweden
Duration: Jul 18 2021Jul 23 2021

Publication series

NameECS Transactions
Number1
Volume103
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

Conference17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021
Country/TerritorySweden
CityStockholm
Period7/18/217/23/21

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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