INFLUENCE OF SURFACE-TREATMENT OF THE P-GAP PHOTOCATHODE ON THE PHOTOELECTROCHEMICAL REDUCTION OF CARBON-DIOXIDE

被引:11
作者
IKEDA, S
YAMAMOTO, A
NODA, H
MAEDA, M
ITO, K
机构
关键词
D O I
10.1246/bcsj.66.2473
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Effects of the surface treatments of p-GaP electrodes with various etchants on the photoelectroreduction of CO2 were investigated in 0.1 mol dm-3 KHCO3 aqueous solution. The catalytic activities for CO2 photoelectroreduction of p-GaP electrodes depended on the etchants and also their crystallographic orientations, (100) or (111) faces. The reduction products were only HCOO- and CO from CO2, and H-2 as a by-product. Aqua regia was prefer to produce HCOO- on both faces. Conc. HCl was effective for HCOO- formation on the (111) face. Although the alkaline potassium hexacyanoferrate(III) solution was effective for reducing the overpotential and increase the photocurrent, the main product was H-2. Conc. HNO3 was not effective.
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页码:2473 / 2477
页数:5
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