Photoelectrochemical reduction of CO2 on Cu/Cu2O films: Product distribution and pH effects
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Undergraduate course
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Elsevier B.V.
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Article
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Abstract
This work focuses on photoelectrochemical CO2 reduction at a Cu/Cu2O electrode (1 x 1 cm(2)). The formation of methanol, ethanol, formaldehyde, acetaldehyde, and acetone was monitored during UV-visible radiation for 3 h at +0.20 V (vs. Ag/AgCl reference); 80% of the initial CO2 was removed. In this process, the photogenerated electrons in the p-type Cu2O semiconductor reduced CO2 (CO2 + e(-) --> CO2-center dot). Subsequent reaction involved radical species that originated during photolysis and dictated the product distribution observed. Methanol formation prevailed for a short period (<30 min); acetaldehyde and acetone were the main products after a longer accumulation period (>120 min). A reaction scheme is presented to account for the product evolution and reactions with the H-center dot, CH3 center dot, and OH center dot radical species generated in situ. The medium pH was identified as a key variable in the selectivity of the methanol formation. (C) 2014 Elsevier B.V. All rights reserved.
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Keywords
Cu/Cu2O semiconductor, Carbon dioxide conversion, Synthesis of methanol from CO2
Language
English
Citation
Chemical Engineering Journal, v. 264, p. 302-309, 2015.
