Development of the system of selective alcohol production from carbon dioxide

用汞敏化光化学气相沉积法制备了非晶态p-碳化硅薄膜电极，研究了室温下CO_2在水溶液中的光电化学还原过程。虽然80%的光电流被用于质子(制氢)的还原，但选择性地获得了甲醇作为CO_2还原产物，在-1.5V对SCE的电流效率高达18%。同时还得到了少量的CO和CH4，并用储氢材料Pd实现了二氧化碳的电化学还原。氢被吸附到Pd电极后，CO和HCOOH的法拉第效率提高。这是由于抑制了产氢和/或提高了CO和HCOOH的实际反应速率，提高了CO_2还原的选择性。

The photoelectrochemical reduction of CO_2 has been examined on the amorphous p-SiC thin film electrode, prepared by Mercury sensitized Photo-CVD, in aqueous electrolytes at room temperature. Although 80% of the photocurrent was used for reduction of proton(hydrogen production), Methanol was selectively obtained as the CO_2 reduction product with a current efficiency of up to 18% at -1.5V vs SCE. Small quantities of CO and CH_4 were also obtained.The electrochemical Carbon dioxide reduction was also c. -)ne using one of the hydrogen-storing materials, Pd. The faradaic efficiencies for CO and HCOOH production increased after hydrogen was absorbed into the Pd electrode. This was due to the increase of the electivity for CO_2 reduction resulting from suppression of hydrogen production and/or the increase of actual reaction rates for CO and HCOOH production.