CO 2 -to-Formate Conversion by Pulse Electrodeposited Sn on Cu Electrode

Abstract

Tin was electrodeposited for the first time on copper electrode with different pulse current densities and cycle times. The optimized one (namely CuSn (30–12C) ) has a rougher surface, a smaller electron transport resistance, and a larger electrochemical surface area than others, exhibiting the best catalytic activity, a faster Faraday process, and the highest selectivity for the production of HCOO − in ERCO 2 . At −1.6 V vs SCE, a HCOO − Faraday efficiency of 84.5% was achieved and the current density was 45.4 mA cm −2 at −2.0 V vs SCE. In addition, this optimized electrode also has a catalytic stability of up to 23 h.