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, Xinhe Bao
Abstract
Abstract Metal nanoparticles anchored on perovskite through in situ exsolution under reducing atmosphere provide catalytically active metal/oxide interfaces for CO 2 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 Sr 2 Fe 1.4 Ru 0.1 Mo 0.5 O 6− 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 Sr 2 Fe 1.4 Ru 0.1 Mo 0.5 O 6− δ perovskite under reducing and oxidizing atmosphere, as well as the facilitated CO 2 adsorption at RuFe@Sr 2 Fe 1.4 Ru 0.1 Mo 0.5 O 6− δ interfaces. Solid oxide electrolysis cell with RuFe@Sr 2 Fe 1.4 Ru 0.1 Mo 0.5 O 6− δ interfaces shows over 74.6% enhancement in current density of CO 2 electrolysis compared to that with Sr 2 Fe 1.4 Ru 0.1 Mo 0.5 O 6− δ counterpart as well as impressive stability for 1000 h at 1.2 V and 800 °C.