Interface engineering has been an alternative strategy applied to catalysts, which is desirable for CO₂ electrochemical reduction reaction (ECO₂RR) to obtain high selectivity for specific products. Herein, we report Cu/In(OH)₃ heterogeneous structure catalyst attached on mildly oxidized carbon nanotubes (CNTs) originating from CuO/In(OH)₃ via a facile wet hydrolysis precipitation method for ECO₂RR. The selectivity of CO can be tuned by slightly adjusting the In/(Cu + In) (Y_In) atomic fraction. Typically, high Faradaic efficiency (FE) of CO (89%) with the partial current density of 10.1 mA/cm² at –1.0 V(versus a reversible hydrogen electrode, RHE) is obtained at Y_In = 4.5%, outperforming the most reported Cu-In based catalysts. The strong interaction between Cu and In(OH)₃ are responsible to promote FE_CO. Designing the metal/metal hydroxide electrocatalysts for electrochemical CO₂ reduction reaction opens an alternative opportunity for optimizing efficient and selective catalysts for desired products.

界面工程已成为应用于催化剂的替代策略，这对于CO ₂电化学还原反应（ECO ₂ RR）以获得特定产品的高选择性是理想的。本文中，我们报告了通过简便的湿式水解沉淀法对ECO ₂ RR附着在源自CuO / In（OH）_3的轻度氧化碳纳米管（CNT）上的Cu / In（OH）₃异质结构催化剂。可以通过稍微调整In /（Cu + In）（Y _In）原子分数来调整CO的选择性。通常，CO的高法拉第效率（FE）（89％）和部分电流密度为10.1 mA / cm ²在– 1.0 V时（相对于可逆氢电极，RHE）在Y _In = 4.5％时可获得，胜过大多数报道的基于Cu-In的催化剂。Cu和In（OH）₃之间的强相互作用是促进FE _CO的原因。设计用于电化学CO ₂还原反应的金属/金属氢氧化物电催化剂为优化所需产品的高效和选择性催化剂提供了另一种机会。