| Summary: | 碩士 === 國立中興大學 === 化學工程學系所 === 99 === Hydrogen is a source of clean energy. The photocatalyst applied to water splitting generate hydrogen when it is activated by the light. Many studies have investigated the photocatalysis, and the most extensive photocatalyst is titanium oxide(TiO2). Due to its photo-electrochemical stability, non-toxicity, and low cost for fabrication. Highly ordered TiO2 nanotubes have a potential application for hydrogen generation application from photo electrochemical cell.
This study will synthesize TiO2 nanotube array by the anodization method, since these ordered architecture of nanotube array provide a high specific surface area and a unidirectional electric channel for electron’s transport. To achieve the highly order TiO2 nanotube array, the different of electrolyte composition, anodization voltage, anodization time and calcinations temperature have been effectively controlled. The photoconversion efficiency of the TiO2 nanotube array was 10.47%. Further to enhance the photocatalytic activity, an chemical reduction method will be used to dope Ag on the TiO2 nanotube array. In order to avoid the formation of recombination centers for photo-generated electron-hole pairs, the modified TiO2 nanotube array could optimize the hydrogen and photoconversion efficiency. The photoconversion efficiency of the modified TiO2 nanotube array achieves 11.68%.
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