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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.

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