二氧化碳在铜氧化膜电极上的光电化学还原

CO_2 Photoelectrochemical Reduction at Copper Anode Oxide Film

本文研究了CO_2在铜阳极氧化膜电极上的光电化学还原行为,在还原电量小于0.1C时,CH_4 的产率较高;还原电量大于2.0C时,主要还原产物为CH_3OH,还对CH_4的产率随外加电位、还原电量和铜阳极氧化膜制备条件的变化关系进行了研究,并对其还原机理作了初步探讨。

The photoelectrochemical reduction of CO2 was studied at copper anode oxide film. The anodic oxide film on copper electrode consists of Cu2O and CuO, which are p-type semiconductors. In the case of lower electric quantity (Q<0. 10 C) for reduction, the higher Faradaic efficiencies for CH4 were achieved on the film, and in the case of higher electric quantity for reduction, however, CH3OH was the main product. The Faradaic efficiency for CH4 as a function of the applied potential, the electric quantity for reduction and the condition of forming the anodic oxide film were determined. The preliminary mechanism of CO2 photoelectrochemical reduction is presented.