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Vol. 14 (2022)

High-Entropy Perovskite Oxide: A New Opportunity for Developing Highly Active and Durable Air Electrode for Reversible Protonic Ceramic Electrochemical Cells

https://doi.org/10.1007/s40820-022-00967-6
Zuoqing Liu
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, People’s Republic of China
Zhengjie Tang
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, People’s Republic of China
Yufei Song
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
Guangming Yang
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, People’s Republic of China
Wanru Qian
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, People’s Republic of China
Meiting Yang
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, People’s Republic of China
Yinlong Zhu
Institute for Frontier Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People’s Republic of China
Ran Ran
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, People’s Republic of China
Wei Wang
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, People’s Republic of China
Wei Zhou
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, People’s Republic of China
Zongping Shao
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, People’s Republic of China

Corresponding Author: Zongping Shao

shaozp@njtech.edu.cn

Nano-Micro Letters, Vol. 14 (2022), Article Number: 217

Abstract

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. However, 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 equimolar metals in the A-site, Pr1/6La1/6Nd1/6Ba1/6Sr1/6Ca1/6CoO3−δ (PLNBSCC), is reported as a high-performance bifunctional air electrode for R-PCEC. By harnessing the unique functionalities of multiple elements, 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 °C. 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.


Highlights:


1 Synthesis of high-entropy perovskite oxide for air electrode in reversible proton ceramic electrochemical cells.
2 Triple-conducting high-entropy air electrodes exhibit excellent structural stability and oxygen catalytic activity.
3 The peak power density and current density of the cell with high-entropy air electrode in the fuel cell and electrolysis modes are 1.21 W cm−2 and − 1.95 A cm−2 at 600 °C, respectively.

Keywords

Reversible proton ceramic electrochemical cells High-entropy oxide Air electrode Oxygen reduction reaction Oxygen evolution reaction
Liu, Zuoqing, Zhengjie Tang, Yufei Song, Guangming Yang, Wanru Qian, Meiting Yang, Yinlong Zhu, Ran Ran, Wei Wang, Wei Zhou, and Zongping Shao. 2022. “High-Entropy Perovskite Oxide: A New Opportunity for Developing Highly Active and Durable Air Electrode for Reversible Protonic Ceramic Electrochemical Cells”. Nano-Micro Letters 14 (November):217. https://doi.org/10.1007/s40820-022-00967-6.
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