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Understanding of A-site Deficiency in Layered Perovskites: Promotion of Dual Reaction Kinetics for Water Oxidation and Oxygen Reduction in Protonic Ceramic Electrochemical Cells

Abstract

Protonic ceramic electrochemical cells (PCECs) are a promising solid-state energy conversion device which enables conversion of energy between electricity and hydrogen at intermediate temperatures. Rapid conversion between chemical and electrical energy via PCEC technology will assist in meeting the energy storage grand challenge. To achieve highly efficient reversible operation between hydrogen production and electricity generation, boosting water-oxidation and oxygen reduction activities of the oxygen electrode while maintaining the durable operation is one of the early-stage technical opportunities. In this study, an A-site deficient layered perovskite (PrBa0.8Ca0.2)0.95Co2O6-δ has been developed as an oxygen electrode in a PCEC which presents superior electrochemical performances. The electrolysis current density has reached as high as -0.72 A cm-2 at 1.3 V , and the peak power density of 540 mW cm-2 is obtained at 600 ○C in electrolysis and fuel cell mode, respectively. The PCEC with the new electrode shows good durability against practical operation conditions for 160 hours in both operating modes with no observable degradation. The reversibility between electrolysis and fuel cell mode is also successfully demonstrated

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Supplementary files

Article information


Accepted
22 Jun 2020
First published
25 Jun 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Paper

Understanding of A-site Deficiency in Layered Perovskites: Promotion of Dual Reaction Kinetics for Water Oxidation and Oxygen Reduction in Protonic Ceramic Electrochemical Cells

W. Tang, H. Ding, W. Bian, W. Wu, W. Li, X. Liu, J. Y. Gomez, C. Y. Regalado Vera, M. Zhou and D. Ding, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/D0TA05137C

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