| 초록 |
Photoelectrochemical (PEC) water splitting using semiconductor photoelectrodes is one of the most promising and environmentally friendly methods to produce hydrogen from water by utilizing renewable solar energy. In this study, we first prepared 1-D WO3 nanowires (NWs) via an aerosol flame deposition (AFD) process with post annealing. The AFD system, which incorporates a controllable wire feeder for precise tungsten feed rate, is capable to prepare WO3 NWs with desirable length. BiVO4 were decorated over WO3 NWs in the form of nanoparticles by spin coating method. The BiVO4 decorated WO3 heterojunction NW arrays utilizes the individual strengths of WO3 (good electron transport property) and BiVO4 (strong light absorption) and exhibits superior performance under back illumination. The optimal thickness of WO3 nanowires for best-performing nanostructured heterojunction thin film was found in this study. This BiVO4 decorated WO3 photoanode produced a photocurrent of up to 3.8 mA/cm2 under simulated solar light back illumination (100 mW/cm2) at 1.23V vs. RHE. |
