Superscalar Phase Boundaries Derived Multiple Active Sites in SnO_2/Cu_6Sn_5/CuO for Tandem Electroreduction of CO2 to Formic Acid

Yujie Shi; Yijie Wang; Jiayuan YuYuke ChenChaoqiong FangDi JiangQinghua ZhangLin GuXiaowen YuXiao LiHong LiuWeijia Zhou

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Superscalar Phase Boundaries Derived Multiple Active Sites in SnO_2/Cu_6Sn_5/CuO for Tandem Electroreduction of CO2 to Formic Acid

机译：Superscalar Phase Boundaries Derived Multiple Active Sites in SnO_2/Cu_6Sn_5/CuO for Tandem Electroreduction of CO2 to Formic Acid

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The electrocatalytic CO_2 reduction reaction (CO_2RR) to fuels driven byelectrocatalysts is a viable strategy for efficient utilization of emitted CO2.CO_2RR involves multiple-steps, including adsorption, activation, hydrogenation,etc. At present, copper-tin alloy catalysts have shown the capability toreduce CO_2 to formic acid or formate. However, their poor adsorption andactivation capacities for CO_2 molecules, as well as the sluggish kinetics in*H supply restrict the proton-coupled electron transfer processes in theelectrocatalytic CO2RR to produce formic acid. In order to solve the aboveproblems, the ultra-small SnO_2/Cu_6Sn_5/CuO nanocatalysts with superscalarphase boundaries are fabricated by laser sputtering. The introduction ofSnO2 enhances the adsorption and activation of CO_2, while CuO promotesH2O decomposition and provides abundant *H intermediates, resulting intandem catalytic sites on the SnO_2/Cu_6Sn_5/CuO composite catalysts andthus leading to excellent CO_2RR activity and high selectivity to formic acid.The Faradic efficiency of formic acid (FEHCOOH) at the SnO_2/Cu_6Sn_5/CuOelectrode reaches 90.13 along with a high current density of 25.2 mA cm~(?2)at ?0.95 V versus reversible hydrogen electrode. The role of the multiphaseboundaries constructed by introduction of oxides is confirmed by in situinfrared spectroscopy and kinetic isotope effects experiments, which isconsistent with the design concept.

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《Advanced energy materials》 |2023年第13期|2203506.1-2203506.12|共12页
作者
Yujie Shi; Yijie Wang; Jiayuan YuYuke ChenChaoqiong FangDi JiangQinghua ZhangLin GuXiaowen YuXiao LiHong LiuWeijia Zhou;
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作者单位

Institute for Advanced Interdisciplinary Research (iAIR)School of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022, P. R. China;

Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190, P. R. China;

State Key Laboratory of Crystal MaterialsShandong UniversityJinan, Shandong Province 250100, P. R. China;

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正文语种英语
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*H supply; CO_2 activation; electrocatalytic CO_2 reduction; laser sputtering; phase boundaries; tandem catalytic sites;

Superscalar Phase Boundaries Derived Multiple Active Sites in SnO_2/Cu_6Sn_5/CuO for Tandem Electroreduction of CO2 to Formic Acid

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