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Redox Replacement of Silver on MOF‐Derived Cu/C Nanoparticles on Gas Diffusion Electrodes for Electrocatalytic CO 2 Reduction
Author(s) -
Sikdar Nivedita,
Junqueira João R. C.,
Öhl Denis,
Dieckhöfer Stefan,
Quast Thomas,
Braun Michael,
Aiyappa Harshitha B.,
Seisel Sabine,
Andronescu Corina,
Schuhmann Wolfgang
Publication year - 2022
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202104249
Subject(s) - bimetallic strip , redox , catalysis , electrochemistry , diffusion , adsorption , electrode , chemical engineering , materials science , gaseous diffusion , raman spectroscopy , nanoparticle , chemistry , inorganic chemistry , analytical chemistry (journal) , nanotechnology , chromatography , organic chemistry , physics , engineering , thermodynamics , optics
Bimetallic tandem catalysts have emerged as a promising strategy to locally increase the CO flux during electrochemical CO 2 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 CO 2 conversion to C 2+ products compared to non‐Ag‐modified gas‐diffusion electrodes. Gas chromatography and in‐situ Raman measurements in a CO 2 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 ν C−H bands. These findings suggest that two mechanisms operate simultaneously towards the production of HCO 2 H and C−C‐coupled products on the Cu/Ag bimetallic surface.