| 초록 |
Development of artificial photosynthetic system for reducing atmospheric CO2 is one of the fundamental challenges. An attractive strategy for the synthesis of carbon-based fuels is the combination of an electrocatalyst for CO2 reduction with a photoelectrochemical device powered by a renewable source of electrical current. Interestingly nature already has the most efficient enzyme, CODH, which consists of heteroatoms in carbon matrix and catalyzes CO2 to CO with high turnover frequency using sunlight. Inspired by this, we designed p-type silicon nanowire electrode with carbon based material as a heterogeneous photocatalyst for selective CO production. The reduction of CO2 into CO on our p-type silicon nanowire with carbon based catalyst was achieved at a potential more than 800 mV lower than that required with a Cu deposited p-Si electrode and with a chemical selectivity over 95% of faradaic efficiency. Compared with previously reported metal based catalyst, our carbon based catalyst on p-type silicon nanowire is non-precious, environmentally benign, and highly selective. |
