Promoting exsolution of RuFe alloy nanoparticles on Sr2Fe1.4Ru0.1Mo0.5O6−δ via repeated redox manipulations for CO2 electrolysis

Houfu Lv, Le Lin, Xiaomin Zhang, Rongtan Li, Yuefeng Song, Hiroaki Matsumoto, Na Ta, Chaobin Zeng, Qiang Fu, Guoxiong Wang () and Xinhe Bao
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Houfu Lv: Chinese Academy of Sciences
Le Lin: Chinese Academy of Sciences
Xiaomin Zhang: Chinese Academy of Sciences
Rongtan Li: Chinese Academy of Sciences
Yuefeng Song: Chinese Academy of Sciences
Hiroaki Matsumoto: Hitachi High-tech (Shanghai) Co., Ltd
Na Ta: Chinese Academy of Sciences
Chaobin Zeng: Hitachi High-tech (Shanghai) Co., Ltd
Qiang Fu: Chinese Academy of Sciences
Guoxiong Wang: Chinese Academy of Sciences
Xinhe Bao: Chinese Academy of Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract Metal nanoparticles anchored on perovskite through in situ exsolution under reducing atmosphere provide catalytically active metal/oxide interfaces for CO2 electrolysis in solid oxide electrolysis cell. However, there are critical challenges to obtain abundant metal/oxide interfaces due to the sluggish diffusion process of dopant cations inside the bulk perovskite. Herein, we propose a strategy to promote exsolution of RuFe alloy nanoparticles on Sr2Fe1.4Ru0.1Mo0.5O6−δ perovskite by enriching the active Ru underneath the perovskite surface via repeated redox manipulations. In situ scanning transmission electron microscopy demonstrates the dynamic structure evolution of Sr2Fe1.4Ru0.1Mo0.5O6−δ perovskite under reducing and oxidizing atmosphere, as well as the facilitated CO2 adsorption at RuFe@Sr2Fe1.4Ru0.1Mo0.5O6−δ interfaces. Solid oxide electrolysis cell with RuFe@Sr2Fe1.4Ru0.1Mo0.5O6−δ interfaces shows over 74.6% enhancement in current density of CO2 electrolysis compared to that with Sr2Fe1.4Ru0.1Mo0.5O6−δ counterpart as well as impressive stability for 1000 h at 1.2 V and 800 °C.

Date: 2021
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DOI: 10.1038/s41467-021-26001-8

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