Synergistic dual-phase air electrode enables high and durable performance of reversible proton ceramic electrochemical cells

Zuoqing Liu, Yuesheng Bai, Hainan Sun, Daqin Guan, Wenhuai Li, Wei-Hsiang Huang, Chih-Wen Pao, Zhiwei Hu, Guangming Yang (), Yinlong Zhu (), Ran Ran, Wei Zhou and Zongping Shao ()
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Zuoqing Liu: Nanjing Tech University
Yuesheng Bai: Nanjing Tech University
Hainan Sun: Korea Advanced Institute of Science and Technology (KAIST)
Daqin Guan: The Hong Kong Polytechnic University
Wenhuai Li: Nanjing Tech University
Wei-Hsiang Huang: National Synchrotron Radiation Research Center
Chih-Wen Pao: National Synchrotron Radiation Research Center
Zhiwei Hu: Max-Planck-Institute for Chemical Physics of Solids
Guangming Yang: Nanjing Tech University
Yinlong Zhu: Nanjing University of Aeronautics and Astronautics
Ran Ran: Nanjing Tech University
Wei Zhou: Nanjing Tech University
Zongping Shao: Nanjing Tech University

Nature Communications, 2024, vol. 15, issue 1, 1-15

Abstract: Abstract Reversible proton ceramic electrochemical cells are promising solid-state ion devices for efficient power generation and energy storage, but necessitate effective air electrodes to accelerate the commercial application. Here, we construct a triple-conducting hybrid electrode through a stoichiometry tuning strategy, composed of a cubic phase Ba0.5Sr0.5Co0.8Fe0.2O3−δ and a hexagonal phase Ba4Sr4(Co0.8Fe0.2)4O16−δ. Unlike the common method of creating self-assembled hybrids by breaking through material tolerance limits, the strategy of adjusting the stoichiometric ratio of the A-site/B-site not only achieves strong interactions between hybrid phases, but also can efficiently modifies the phase contents. When operate as an air electrode for reversible proton ceramic electrochemical cell, the hybrid electrode with unique dual-phase synergy shows excellent electrochemical performance with a current density of 3.73 A cm−2 @ 1.3 V in electrolysis mode and a peak power density of 1.99 W cm−2 in fuel cell mode at 650 °C.

Date: 2024
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DOI: 10.1038/s41467-024-44767-5

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