Selective electrocatalytic reduction of carbon dioxide to formate by a trimetallic Sn-Co/Cu foam electrode

被引:12
作者
Hu, Qiang [1 ,2 ]
Xu, Mengying [1 ,2 ,3 ]
Hu, Shengjun [1 ,2 ]
Tremblay, Pier-Luc [1 ,2 ]
Zhang, Tian [1 ,2 ,3 ]
机构
[1] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Peoples R China
[2] Wuhan Univ Technol, Sch Chem Chem Engn & Life Sci, Wuhan 430070, Peoples R China
[3] Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Peoples R China
关键词
CO2; electroreduction; Formate; Copper foam; Cobalt; Tin; AQUEOUS CO2 REDUCTION; ELECTROCHEMICAL REDUCTION; PHOTOELECTRON-SPECTROSCOPY; FORMIC-ACID; TIN CATHODE; ELECTROREDUCTION; CONVERSION; OXIDE; EFFICIENCY; CATALYSIS;
D O I
10.1016/j.jelechem.2020.114623
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The selectivity of electrochemical reduction of CO2 to formate in an aqueous NaHCO3 solution was investigated with a series of trimetallic electrodes composed of different weight percentages of SnCo coated on copper foam (Cu-f). The maximum Faradaic efficiency of 72.2% was obtained with a Sn-95-Co-5/Cu-f electrode at a potential of -1.36 V. The Sn-95-Co-5/Cu-f electrode has a formate production rate of 1.12 mmol h(-1), which is 16.7, 1.2, and 2.3 times higher than uncoated Cu-f, Cu-f coated with Sn, and Cu-f coated with Co, respectively. Analysis of the surface of the Sn-95-Co-5/Cu-f electrode shows the formation of a composite layer of SnOx and Co3O4 ensuring good electrical conductivity and CO2 absorption. These results in combination with linear sweep voltammetry indicate that the coating of SnCo on a porous copper scaffold resulted in the fabrication of a promising electrochemical catalyst, which can greatly increase the electrocatalysis selectivity for CO2 reduction to formate.
引用
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页数:8
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