Redox Replacement of Silver on MOF-Derived Cu/C Nanoparticles on Gas Diffusion Electrodes for Electrocatalytic CO2 Reduction

被引：18

作者：

Sikdar, Nivedita ^{[1
]}

Junqueira, Joao R. C. ^{[1
]}

Oehl, Denis ^{[1
]}

Dieckhoefer, Stefan ^{[1
]}

Quast, Thomas ^{[1
]}

Braun, Michael ^{[2
,3
]}

Aiyappa, Harshitha B. ^{[1
]}

Seisel, Sabine ^{[1
]}

Andronescu, Corina ^{[2
,3
]}

Schuhmann, Wolfgang ^{[1
]}

机构：

[1] Ruhr Univ Bochum, Fac Chem & Biochem, Analyt Chem Ctr Electrochem Sci CES, Univ Str 150, D-44780 Bochum, Germany

[2] Univ Duisburg Essen, Fac Chem, Chem Technol 3, Carl Benz Str 199, D-47057 Duisburg, Germany

[3] Univ Duisburg Essen, CENIDE Ctr Nanointegrat, Carl Benz Str 199, D-47057 Duisburg, Germany

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2022年 / 28卷 / 12期

基金：

欧洲研究理事会;

关键词：

cascade reactions; CO2; reduction; electrocatalysis; in-situ Raman spectroscopy; redox replacement; CARBON-DIOXIDE; ELECTROCHEMICAL REDUCTION; COPPER ELECTRODE; ELECTROREDUCTION; CHALLENGES; INSIGHTS; SURFACE;

D O I：

10.1002/chem.202104249

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Bimetallic tandem catalysts have emerged as a promising strategy to locally increase the CO flux during electrochemical CO2 reduction, so as to maximize the rate of conversion to C-C-coupled products. Considering this, a novel Cu/C-Ag nanostructured catalyst has been prepared by a redox replacement process, in which the ratio of the two metals can be tuned by the replacement time. An optimum Cu/Ag composition with similarly sized particles showed the highest CO2 conversion to C2+ products compared to non-Ag-modified gas-diffusion electrodes. Gas chromatography and in-situ Raman measurements in a CO2 gas diffusion cell suggest the formation of top-bound linear adsorbed *CO followed by consumption of CO in the successive cascade steps, as evidenced by the increasing nu C-H bands. These findings suggest that two mechanisms operate simultaneously towards the production of HCO2H and C-C-coupled products on the Cu/Ag bimetallic surface.

引用

页数：9

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