Photoelectrochemical production of formic acid and methanol from carbon dioxide on metal-decorated CuO/Cu2O-layered thin films under visible light irradiation

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As a cathode material for fuel generation from CO2 reduction in a photoelectrochemical system, layered CuO/Cu2O films were developed and their surfaces were decorated with transition metals (i.e. Ag, Au, Cd, Cu, Pb, and Sn). Deposition of the transition metals effectively enhanced CO2 conversion to fuel in terms of faradaic efficiency. In particular, Pb/CuO/Cu2O demonstrated outstanding performance among the transition metals: 0.524 mu mol/h cm(2) for formic acid and 0.102 mu mol/h cm(2) for methanol with 40.45% of total faradaic efficiency at -0.16V (vs. SHE), which was a higher potential than standard redox potentials of formic acid and methanol formation from CO2. Moreover, electrochemical impedance spectroscopy (EIS) showed that the deposition of the transition metals onto CuO/Cu2O electrode effectively generated photo-induced electron-hole pairs under visible light irradiation. However, fast performance degradations of the prepared electrodes were observed during the reactions as well as the disappearances of the photocurrents. X-ray photoelectron spectroscopy (XPS) results revealed that the outer CuO layer was readily reduced to Cu2O/Cu, and this compositional destruction was responsible for the degradation of the photocurrent by prohibiting transfers of the electrons (or holes) to the active sites.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2014-10
Language
English
Article Type
Article
Keywords

SEMICONDUCTOR NANOROD ARRAYS; SELECTIVE CO2 CONVERSION; ELECTROCHEMICAL REDUCTION; ELECTRODES; COPPER; H2O; PHOTOCATHODE; PHOSPHIDE; SURFACES; INSIGHTS

Citation

APPLIED CATALYSIS B-ENVIRONMENTAL, v.158, pp.217 - 223

ISSN
0926-3373
DOI
10.1016/j.apcatb.2014.04.021
URI
http://hdl.handle.net/10203/190030
Appears in Collection
CBE-Journal Papers(저널논문)
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