Photoelectrochemical reduction of carbon dioxide at p-type gallium arsenide and p-type indium phosphide electrodes in methanol
Photoelectrochemical reduction of carbon dioxide at p-type gallium arsenide and p-type indium phosphide electrodes in methanol
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DOI：
10.1016/j.cej.2005.12.014
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发表时间：
2006-03
影响因子：
15.1
通讯作者：
S. Kaneco;H. Katsumata;Tohru Suzuki;K. Ohta
中科院分区：
文献类型：
--
作者：
S. Kaneco;H. Katsumata;Tohru Suzuki;K. Ohta
研究了甲醇电解质中 p 型半导体电极、p-GaAs 和 p-InP 上二氧化碳 (CO2) 的光电化学还原。 CO2的主要产物是一氧化碳和甲酸。相对于 p-GaAs 和 p-InP 电极的 Ag/AgCl（饱和 KCl），甲醇电解质中光阴极电流的起始电势分别约为 -1.2 和 -0.8V。由于与普通金属电极相比，起始光电位更正，因此光辅助电解可以节省相当于 0.3-1.0V 电位转移至较小负电位的电能。 p-InP 光电阴极在 -2.4V 时获得 CO 的最大电流效率（rf=41.5%）。在 p-GaAs 和 p-InP 电极上，CO 的电流效率均优于甲酸。研究发现，p 型磷化铟电极对于甲醇电解液中 CO2 的光电化学还原比 p-Si 和 p-GaAs 更有效。
The photoelectrochemical reduction of carbon dioxide (CO2) at p-type semiconductor electrodes, p-GaAs and p-InP, was studied in the methanol-based electrolyte. The main products from CO2were carbon monoxide and formic acid. The onset potentials of the photocathodic current in the methanol-based electrolyte were around −1.2 and −0.8V versus Ag/AgCl (saturated KCl) with p-GaAs and p-InP electrodes, respectively. Since the onset photopotentials were more positive compared to those with normal metallic electrodes, the photo-aided electrolysis can save electrical energy corresponding to a potential shift of 0.3–1.0V to less negative potentials. The maximum current efficiency for CO (rf=41.5%) was obtained at −2.4V for the p-InP photocathode. The current efficiencies for CO were better relative to those for formic acid at both p-GaAs and p-InP electrodes. The p-type indium phosphide electrode was found to be more effective than p-Si and p-GaAs for the photoelectrochemical reduction of CO2in methanol-based electrolyte.