| 초록 |
Photoelectrochemical (PEC) cell can harvest light and use this energy directly to split water is a promising renewable energy technology to produce hydrogen for uses for the environmental deterioration. A major advantage of PEC systems is that they involve relatively simple processes steps as compared to many other H2 production systems. Until now, a number of materials including TiO2, WO3, Fe2O3, CuWO4, and BiVO4 were exploited as the photoelectrode. However, the PEC performance of these single absorber materials is limited due to their large charge recombinations in bulk, interface and surface, leading low charge separation/transport efficiencies. Recently, coupling of two materials, e.g., BiVO4/WO3, Fe2O3/WO3 and CuWO4/WO3, to form a type II heterojunction has been demonstrated to be a viable means to improve the PEC performance by enhancing the charge separation and transport efficiencies. In this study, we have prepared a SnO2 nanorod array (NRs) with an average thickness of ~400 nm based BiVO4/WO3 multishell heterojunction photoanode that shows a comparable PEC performance via facile VLS method. Importantly, we found that the incorporation of SnO2 nanorods layer in between WO3 and FTO minimizes interfacial recombination, which promotes electron transport. |
