Surface restructuring of a perovskite-type air electrode for reversible protonic ceramic electrochemical cells

Kai Pei, Yucun Zhou, Kang Xu, Hua Zhang, Yong Ding, Bote Zhao, Wei Yuan, Kotaro Sasaki, YongMan Choi*, Yu Chen*, Meilin Liu*

*此作品的通信作者

研究成果: Article同行評審

70 引文 斯高帕斯(Scopus)

摘要

Reversible protonic ceramic electrochemical cells (R-PCECs) are ideally suited for efficient energy storage and conversion; however, one of the limiting factors to high performance is the poor stability and insufficient electrocatalytic activity for oxygen reduction and evolution of the air electrode exposed to the high concentration of steam. Here we report our findings in enhancing the electrochemical activity and durability of a perovskite-type air electrode, Ba0.9Co0.7Fe0.2Nb0.1O3-δ (BCFN), via a water-promoted surface restructuring process. Under properly-controlled operating conditions, the BCFN electrode is naturally restructured to an Nb-rich BCFN electrode covered with Nb-deficient BCFN nanoparticles. When used as the air electrode for a fuel-electrode-supported R-PCEC, good performances are demonstrated at 650 °C, achieving a peak power density of 1.70 W cm−2 in the fuel cell mode and a current density of 2.8 A cm−2 at 1.3 V in the electrolysis mode while maintaining reasonable Faradaic efficiencies and promising durability.
原文English
文章編號2207
期刊Nature Communications
13
DOIs
出版狀態Published - 4月 2022

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