Electrodeposited highly-oriented bismuth microparticles for efficient CO_(2)electroreduction into formate

Bi is one of the most fascinating catalysts for the formation of HCOO-towards CO_(2)electroreduction.Herein,we developed electrodeposited angular-shaped Bi microparticles(Bi MP)with exposed surfaces of{003}and{101}planes as efficient catalyst for the electroreduction of CO_(2)into HCOO-.During CO_(2)electroreduction,Bi MP achieved a Faraday efficiency(FE)for HCOO-of higher than 95%over a wide range of applied potential from-0.6 to-1.1 V versus reversible hydrogen electrode(vs.RHE),whereas the FE for HCOO-of Bi nanoflakes(Bi NF)with exposed surfaces of{104}and{110}planes was around 70%.At-1.1 V vs.RHE,the partial current density for HCOO-of Bi MP was-271.7 mA·cm-2,1.56 times as high as that of Bi NF.According to kinetic analysis and mechanistic study,highly-oriented surface of Bi MP not only facilitated Faradaic process and accelerated reaction kinetics via enhancing the CO_(2)activation,but also restrained competing hydrogen evolution reaction,thus boosting catalytic performance of the electroreduction of CO_(2)into HCOO-.