摘要
CO_(2)electroreduction reaction(CO_(2)RR)has been considered as an effective technology to close the anthropogenic carbon cycle.Formate,a product of two-electron transfer in CO_(2)RR,is an economically valuable feedstock.In this work,nanoporous tin oxides were controllable synthesized by a facile and scalable electrochemical anodic oxidation method.XPS result indicated that the increased Sn 4þspecies after anodic oxidation were beneficial to reduce the overpotential of formate formation.Operando Raman spectra revealed that the enhanced formate selectivity could be attributed to the high local pH within the porous structure,which suppresses hydrogen evolution reaction(competing reaction against CO_(2)RR).Further flow cell test showed a formate partial current density of 285 mA cm^(-2)with the selectivity of 96.4%,indicating a promising industrial application prospect.
基金
The authors are grateful to the financial support from the Science and Technology Major Project of Tianjin(Grant Nos.19ZXNCGX00030 and 20JCYBJC00870)
National Natural Science Foundation of China(Grant Nos.21938008 and 22078232).
