Synergistic catalytic reduction of CO2 to formic acid by Sn-Co bimetal on carbon cloth
HU Qiang1， XU Mengying2， TREMBLAY Pier-Luc1， ZHANG Tian1,2
1.School of Chemistry Chemical Engineering and Life Sciences，Wuhan University of Technology，Wuhan 430070，China；2.School of Materials Science and Engineering， Wuhan University of Technology， Wuhan 430070， China
Abstract：A tin-cobalt bimetallic electrode material (SnxCoy/CC) was prepared by electroplating in different molar ratio solutions. The composition， micro-morphology and structure were characterized by XRD， SEM， XPS and BET. The results showed that the Sn-Co bimetal was successfully electrodeposited on the CC. The electrocatalytic performance of the electrode material for CO2 reduction was evaluated by linear cyclic voltammetry， chronoamperometry and impedance analysis. When the content ofcobalt doping in the bimetallic is 40%， cubic bimetallic particles with rice spike morphology grow on the carbon brazing dimension， and the electrocatalytic material has the lowest charge transfer resistance.The XPS analysis indicated that the metal elements on the surface of the bimetallic electrode exist with the form of SnOx and Co3O4 in the oxidation state which displayed better catalytic effect. At －1.16 V (vs. RHE)， the Faraday efficiency of Sn60Co40/CC of formate reached 57.4%， which is higher than the single metal Sn 42.3%， manifesting that doping cobaltand controlling morphology would effectively improve the electrocatalytic performance.
2021, Vol. 55 
