【摘要】 <正> 1870年,Royer使用Zn电极将CO₂还原为HCOOH。近年来,人们对CO₂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CO₂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CO₂还原的过电位,所以人们对CO₂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_g=1.12eV,更多还原

【Abstract】 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.更多还原