电化学2020，Vol.26Issue(6)：797-807,11.DOI:10.13208/j.electrochem.191228
反应条件对铜催化CO2电还原的影响
Effect of Reaction Conditions on Cu-Catalyzed CO2 Electroreduction
摘要
Abstract
Electrochemical conversion of carbon dioxide(CO2)driven by renewable electricity that can meet both carbon emis-sion reduction and renewable energy utilization has been rapidly developed in recent years.Copper(Cu)catalyst has long been a promising candidate for CO2 electroreduction applications because of its natural abundance and specific capability of producing a substantial amount of C2 products.However,various metallic Cu electrodes reported have been significantly influenced by the ad-sorption of certain cation/anion ions,resulting in wide-span catalytic activities and selectivity for various products.In addition,a re-cent report demonstrated that by virtue of gas-diffusion flow cell with Cu cathode,remarkable ethylene production was achieved in CO2 electroreduction.It is,therefore,desirable to systematically investigate the effect of reaction conditions on the performances of Cu-catalyzed CO2 electroreduction.Here we chose the commercial Cu particles with an average size of 600 nm as the catalyst for CO2 electroreduction and investigated the electrocatalytic performances under various reaction conditions,including the commonly used electrolyte solutions,the different potassium hydrogen carbonate(KHCO3)concentrations,as well as H-type and gas-diffusion flow cells.The results of linear sweep voltammetry and potentiostatic CO2 electrolysis showed that KHCO3 as an electrolyte solu-tion with a concentration of 0.5 mol·L-1 offered good catalytic activities and high current densities,and the gas-diffusion flow cell could further improve the Faradaic efficiencies and partial current densities of the main products formate and CO.This work pro-vides a fundamental insight to the electrocatalytic conversion of CO2 reduction from the view of reaction conditions.关键词
二氧化碳电还原/铜催化剂/反应条件/气体扩散电极Key words
CO2 electroreduction/copper catalyst/reaction conditions/gas-diffusion electrode分类
化学化工引用本文复制引用
朱畅,陈为,宋艳芳,董笑,李桂花,魏伟,孙予罕..反应条件对铜催化CO2电还原的影响[J].电化学,2020,26(6):797-807,11.基金项目
This work was supported by the National Natural Science Foundation of China(Nos.91745114,21802160),the Ministry of Science and Technology of China(Nos.2016YFA0202800,2018YFB0604700),Shanghai Sailing Program(No.18YF1425700),Shanghai Advanced Research Institute Innovation Research Program(Nos.Y756812ZZ1 and Y756803ZZ1),and Shanghai Functional Platform for Innovation Low Carbon Technology. W.C. also acknowledges the support from the Hundred Talents Program of Chinese Academy of Sciences. （Nos.91745114,21802160）
