摘要
1870年,Royer使用Zn电极将CO<sub>2</sub>还原为HCOOH。近年来,人们对CO<sub>2</sub>在几十种金属电极上的电化学还原进行了深入的研究。但普遍存在的问题是CO<sub>2</sub>在金属电极上还原的过电位较大,导致耗电较多。而半导体电极能吸收光能降低CO<sub>2</sub>还原的过电位,所以人们对CO<sub>2</sub>在半导体电极上的光电还原进行了探讨,使用的光阴极材料有P-GaP,P-GaAs,P-InP,P-CdTe。半导体Si的禁带宽度E<sub>g</sub>=1.12eV,
The photoelectrochemical reduction of carbon dioxide on P+/P-silicon electrode in aqueous solution was reported. The effects of cathodic polarization potential, electrolysis time and electrolyte pH, were studied by means of electrochemical voltammetry and prolonged electrolysis. The cathodic reduction products were formic acid and a small amount of formaldehyde. A power energy conversion efficiency of 4.0% of carbon dioxide reduction was achieved. Also the photoelectrochemical reduction process of carbon dioxide was discussed.
出处
《感光科学与光化学》
CSCD
1992年第2期180-184,共5页
Photographic Science and Photochemistry
基金
国家自然科学基金
关键词
二氧化碳
半导体
P^+/P-Si
光阴极
Reduction of carbon dioxide, P+/P-Si Photocathode, Solar energy conversion
