| 초록 |
Reconverting waste CO2, a greenhouse gas, into useful chemical fuels by harnessing sunlight, an abundant energy source, is an ideal solution in which the economy can start to be weaned from the limited fossil fuel supply while simultaneously reversing the greenhouse effect. Si exhibits activity towards H2 generation from aqueous proton, but with appropriate catalysts it is also able to reduce CO2 in photoelectrochemical (PEC) systems. In this work, PEC reduction of CO2 to CO in ambient, aqueous conditions was achieved on planar p-Si and p-Si nanowires (NW) with electrodeposited Au nanoparticles (NP) and with pyridine as a co-catalyst. p-Si NW showed improvements in both the overall current density and CO selectivity at comparable electrical potentials with planar p-Si under standard irradiation conditions. Incorporation of Au NP enhanced CO selectivity fourfold in both planar p-Si and p-Si NW. Maximum CO faradaic efficiency of 13.6% was achieved on p-Si NW at -1.18 V vs. RHE. |
