This work focuses on photoelectrochemical CO2 reduction at a Cu/Cu2O electrode (1 1 cm2
). 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
).
Subsequent reaction involved radical species that originated during photolysis and dictated the product
distribution observed. Methanol formation prevailed for a short period (120 min). A reaction scheme is presented
to account for the product evolution and reactions with the H
, CH3
, and OH radical species generated
in situ. The medium pH was identified as a key variable in the selectivity of the methanol
formation.
2
This work focuses on photoelectrochemical CO2 reduction at a Cu/Cu2O electrode (1 1 cm2). The formationof methanol, ethanol, formaldehyde, acetaldehyde, and acetone was monitored during UV–visibleradiation 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).Subsequent reaction involved radical species that originated during photolysis and dictated the productdistribution observed. Methanol formation prevailed for a short period (<30 min); acetaldehyde andacetone were the main products after a longer accumulation period (>120 min). A reaction scheme is presentedto account for the product evolution and reactions with the H, CH3, and OH radical species generatedin situ. The medium pH was identified as a key variable in the selectivity of the methanolformation. 2
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