Reversible proton ceramic electrochemical cell(R-PCEC)is regarded as the most promising energy conversion device,which can realize efficient mutual conversion of electrical and chemical energy and to solve the problem of large-scale energy storage.How-ever,the development of robust electrodes with high catalytic activity is the main bottleneck for the commercialization of R-PCECs.Here,a novel type of high-entropy perovskite oxide consisting of six equimo-lar metals in the A-site,Pr1/6La1/6Nd1/6Ba1/6Sr1/6Ca1/6CoO3-δ(PLN-BSCC),is reported as a high-performance bifunctional air electrode for R-PCEC.By harnessing the unique functionalities of multiple ele-ments,high-entropy perovskite oxide can be anticipated to accelerate reaction rates in both fuel cell and electrolysis modes.Especially,an R-PCEC utilizing the PLNBSCC air electrode achieves exceptional electrochemical performances,demonstrating a peak power density of 1.21 W cm-2 for the fuel cell,while simultaneously obtaining an astonishing current density of-1.95 A cm-2 at an electrolysis voltage of 1.3 V and a temperature of 600℃.The significantly enhanced electrochemical performance and durability of the PLNBSCC air electrode is attributed mainly to the high electrons/ions conductivity,fast hydration reactivity and high configurational entropy.This research explores to a new avenue to develop optimally active and stable air electrodes for R-PCECs.

Zuoqing Liu;Zhengjie Tang;Yufei Song;Guangming Yang;Wanru Qian;Meiting Yang;Yinlong Zhu;Ran Ran;Wei Wang;Wei Zhou;Zongping Shao

State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemical Engineering,Nanjing Tech University,Nanjing 211816,People's Republic of China;Department of Mechanical and Aerospace Engineering,The Hong Kong University of Science and Technology,Clear Water Bay,Hong Kong 999077,People's Republic of China;Institute for Frontier Science,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,People's Republic of China;WA School of Mines:Minerals,Energy and Chemical Engineering(WASM-MECE),Curtin University,Perth,WA 6845,Australia

纳微快报（英文）

[1]Zuoqing Liu;Zhengjie Tang;Yufei Song;Guangming Yang;Wanru Qian;Meiting Yang;Yinlong Zhu;Ran Ran;Wei Wang;Wei Zhou;Zongping Shao-.High-Entropy Perovskite Oxide:A New Opportunity for Developing Highly Active and Durable Air Electrode for Reversible Protonic Ceramic Electrochemical Cells)[J].纳微快报（英文）,2022(12):505-520

Protonic,PCEC,PCECs,equimo,6La1,6Nd1,6Ba1,6Sr1,6Ca1,6CoO3,BSCC,PLNBSCC

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