CO 2 to Formic Acid Using Cu–Sn on Laser-Induced Graphene

作者：Muqing Ren, Hongzhi Zheng, Jincheng Lei, Jibo Zhang, Xiaojun Wang, Boris I. Yakobson, Yan Yao, James M. Tour · 发表于：ACS Applied Materials & Interfaces · 年份：2020 · DOI：10.1021/acsami.0c08964 · 被引用次数：76 · 研究领域：CO2 Reduction Techniques and Catalysts、Carbon dioxide utilization in catalysis、Ionic liquids properties and applications

Converting CO 2 into fuels and other value-added chemicals via an electrochemical reduction method has recently attracted great interest. However, there are still challenges to find suitable catalysts with high selectivity toward the formic acid formation. Here, we report the bimetallic CuSn-based catalyst to reduce CO 2 to formic acid by optimizing the ratio of Cu to Sn to achieve the optimal selectivity. The catalyst is generated on laser-induced graphene. Among the catalysts, CuSn-4 with Cu/Sn atomic ratio close to 1:2 shows a faradaic efficiency of 99% toward formic acid with a high partial current density of 26 mA/cm 2 . Density functional theory calculations demonstrate that OCHO* intermediate formation is more favorable than that of COOH* on Sn sites, while OCHO* intermediate formation is moderate on Cu sites. The synergetic catalytic effect between Cu and Sn would further favor HCOOH formation. This study provides significant insight into the mechanism of formic acid formation.