| 초록 |
While photoconversion of CO2 into C1 hydrocarbon products, notably methane (CH4), is known, the ability to directly achieve significant quantities of higher-order hydrocarbons represents an important step towards practical implementation of solar fuel technologies. We describe an efficient, stable, and readily synthesized CO2-reduction photocatalyst that produces a record high combined photocatalytic yield of ethane (C2H6) and methane. For the first time, a systematic ultraviolet photoelectron spectroscopy study on the mechanism underlying ethane formation indicates that the process is dependent upon upward band bending at the reduced blue-titania/graphene interface. The photocatalyst exhibits an apparent quantum yield of 7.9%, 5.2% CH4 and 2.7% C2H6, and stable photocatalytic performance over the test duration of 42 h. The carbon source for both products is verified using 13CO2 isotopic experiments. |
