| Summary: | 碩士 === 逢甲大學 === 材料科學與工程學系 === 104 === Although TiO2 used to be a commonly used material for photocatalysis reaction, due to its wide band-gap (3.2 eV), it can solely absorb the ultraviolet light of the solar spectrum, which accounts for only 4% of total sunlight. It can only separate charge carriers under UV light irradiation, which greatly limiting its practical applications. Modification of TiO2 have been more important in research of photocatalysis reactions. Using two metal oxide semiconductors is one of the most common method. When MoO3 and TiO2 contacts forming heterogeneous interface, photogenerated holes transfer from MoO3 to TiO2 while electrons transfer to surface of MoO3 to form H2. It can efficiently separate the photogenerated electron-hole pairs and promote the photocatalysis efficiency. This additional photocurrent enhancement is attributed to the strong near-field and light scattering effects from the plasmonic Ag NPs. In our work, we report the fabrication of MoO3-coated TiO2 nanotubes heterostructures with 3D hierarchical configuration by a two-step anodic oxidation and a facile hydrothermal method. Such a 3D hierarchical structure consists of a core of TiO2 nanotubes and shell of MoO3 (referred to as TNTs@MoO3). In addition, formation of MoO3 and activated carbon (AC) core-shell structure will be used in supercapacitors. Using synergistic effect of AC@MoO3 composite to improve the supercapacitor performance.
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