Effect of mass transfer and kinetics in ordered Cu-mesostructures for electrochemical CO2 reduction

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Mass transfer, kinetics, and mechanism of electrochemical CO2 reduction have been explored on a model mesostructure of highly-ordered copper inverse opal (Cu-IO), which was fabricated by Cu electrodeposition in a hexagonally-closed packed polystyrene template. As the number of Cu-IO layers increases, the formation of C-2 products such as C2H4 and C2H5OH was significantly enhanced at reduced overpotentials (similar to 200 mV) compared to a planar Cu electrode. At the thickest layer, we observe for the first time the formation of acetylene (C2H2), which can be generated through a kinetically slow reaction pathway and be a key descriptor in the unveiling of the C-C coupling reaction mechanism. Based on our experimental observation, a plausible reaction pathway in Cu mesostructures is rationalized.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2018-09
Language
English
Article Type
Article
Keywords

CARBON-DIOXIDE; PHOTOCATALYTIC REDUCTION; COPPER ELECTRODES; CATALYSTS; ELECTROREDUCTION; HYDROCARBONS; SURFACE; FILMS; HYDROGENATION; NANOPARTICLES

Citation

APPLIED CATALYSIS B-ENVIRONMENTAL, v.232, pp.391 - 396

ISSN
0926-3373
DOI
10.1016/j.apcatb.2018.03.071
URI
http://hdl.handle.net/10203/242585
Appears in Collection
EEW-Journal Papers(저널논문)
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