Concurrent promotion of phase transition and bimetallic nanocatalyst exsolution in perovskite oxides driven by Pd doping to achieve highly active bifunctional fuel electrodes for reversible solid oxide electrochemical cells

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The reducibility of B-site elements in perovskite (ABO3) structures is one of the paramount factors that promote the in-situ exsolution of metallic nanocatalysts, and the phase transition of the support to a more stable structure under solid oxide cell (SOC) fuel electrode operating conditions. Herein, we develop a highly catalytically active and durable perovskite-based fuel electrode material & mdash;La0.6Sr0.4Co0.15Fe0.8Pd0.05O3-delta (LSCFP)& mdash;for reversible SOCs. The LSCFP material under the fuel electrode condition is fully transformed into a stable Ruddlesden-Popper phase decorated by bimetallic Co-Fe nanocatalysts. The SOC with LSCFP fuel electrode yielded outstanding performances in both fuel cell (2.00 W cm-2) and electrolysis cell (2.23 A/cm(2) at 1.3 V) modes at 850 ?C, with remarkable reversible-cyclic stability. These results clearly demonstrate that the novel LSCFP capable of concurrent phase transition and bimetallic exsolution in the reducing condition is a highly prospective candidate as a bifunctional fuel electrode for reversible SOCs.
Publisher
ELSEVIER
Issue Date
2022-10
Language
English
Article Type
Article
Citation

APPLIED CATALYSIS B-ENVIRONMENTAL, v.314

ISSN
0926-3373
DOI
10.1016/j.apcatb.2022.121517
URI
http://hdl.handle.net/10203/297082
Appears in Collection
ME-Journal Papers(저널논문)
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