Selective electrocatalytic reduction of CO₂ to formate has received increasing interest for CO₂ conversion and utilization. Yet, the CO₂ reduction process still faces major challenges, partly due to the lack of cost-effective, highly active, selective and stable electrocatalysts. Here, we report a mesoporous indium (mp-In) electrocatalyst composed of nanobelts synthesized via a simple solution-based approach for selective CO₂ reduction to formate. The mp-In nanocrystals provide enlarged surface areas, abundant surface active sites and edge/low-coordinated sites. Such advantages afford the mp-In with an outstanding electrocatalytic performance for the CO₂-to-formate conversion. A high formate selectivity, with a Faradaic efficiency (FE) of >90% was achieved over a potential of −0.95 V to −1.1 V (vs V_RHE). The mp-In catalyst showed excellent durability, reflected by the stable formate selectivity and current density over a 24 h reaction period. Density functional theory (DFT) calculations reveal that the stabilization of the intermediate OCHO* on the In-plane surfaces is energetically feasible, further elucidating the origin of its enhanced CO₂-to-formate activity and selectivity. This work may offer valuable insights for the facile fabrication of porous hierarchical nanostructures for electrocatalytic and selective reduction of CO₂.

将CO ₂选择性电催化还原成甲酸酯对CO ₂转化和利用的兴趣日益增加。然而，CO ₂还原过程仍然面临主要挑战，部分原因是缺乏经济高效，高活性，选择性和稳定的电催化剂。在这里，我们报告了介孔铟（mp -In）电催化剂，它由通过简单的基于溶液的方法合成的纳米带组成，用于将CO ₂选择性还原成甲酸酯。的熔点-In纳米晶体提供了增大的表面积，丰富的表面活性位点和边缘/低配位的位点。这样的优势使国会议员-In具有出色的电催化性能，可将CO ₂转化为甲酸酯。在-0.95 V至-1.1 V的电位（相对于V _RHE）上，具有高的法拉第效率（FE）> 90％的甲酸选择性。的熔点-In催化剂显示出优异的耐久性，由稳定甲酸选择性和电流密度在24小时的反应周期反射。密度泛函理论（DFT）计算表明，中间OCHO *在平面内表面的稳定化在能量上是可行的，从而进一步阐明了其增强的CO ₂的起源形成活性和选择性。这项工作可能为多孔结构纳米结构的电催化和选择性还原CO ₂的便捷制造提供有价值的见解。