Nano-crumples induced Sn-Bi bimetallic interface pattern with moderate electron bank for highly efficient CO2 electroreduction
Bohua Ren, Guobin Wen, Rui Gao, Dan Luo, Zhen Zhang, Weibin Qiu, Qianyi Ma, Xin Wang, Yi Cui, Luis Ricardez‐Sandoval, Aiping Yu, Zhongwei Chen
Abstract
Abstract CO 2 electroreduction reaction offers an attractive approach to global carbon neutrality. Industrial CO 2 electrolysis towards formate requires stepped-up current densities, which is limited by the difficulty of precisely reconciling the competing intermediates (COOH* and HCOO*). Herein, nano-crumples induced Sn-Bi bimetallic interface-rich materials are in situ designed by tailored electrodeposition under CO 2 electrolysis conditions, significantly expediting formate production. Compared with Sn-Bi bulk alloy and pure Sn, this Sn-Bi interface pattern delivers optimum upshift of Sn p-band center, accordingly the moderate valence electron depletion, which leads to weakened Sn-C hybridization of competing COOH* and suitable Sn-O hybridization of HCOO*. Superior partial current density up to 140 mA/cm 2 for formate is achieved. High Faradaic efficiency (>90%) is maintained at a wide potential window with a durability of 160 h. In this work, we elevate the interface design of highly active and stable materials for efficient CO 2 electroreduction.