| 초록 |
In photoelectrochemical water oxidation using metal oxide materials, there are promising oxide materials like TiO2, WO3, BiVO4, Fe2O3. hematite (Fe2O3) has advantages in commercialization aspect due to its earth abundancy and proper band position, gap which is connected to high theoretical photo-current value(~12.6mA/cm2). However, hematite has several drawbacks like poor conductivity and short diffusion length of hole(2~4nm) are inevitable problem. To overcome these drawbacks, doping, heterojunction, co-catalyst, passivation layer, morphology control is considered. In doping process, although most of works reported about metal dopant which replace Fe site, there are a few reported papers which applied non-metal dopant such as S, P, F. In this project, we applied metal, non-metal co-doping method with Titanium and Fluorine. We confirmed successfully F, Ti co-doped hematite with enhanced photoelectrochemical activity and introduced different effect of each dopant. |
