| Summary: | 碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 105 === Devices for sustainable technologies have received intense attention as they serve as the promising solutions to the energy and the environmental issues. To fulfill the high performance and mass production, optimization of these devices with development of cost-efficient and well-defined materials is the first priority. In this thesis, the green synthesis of a kind of new energy nanomaterial CuGaO2 and its applications for p-type dye sensitizes solar cells (DSSCs) and hydrogen gas production from water are demonstrated.
DSSCs, as one type of promising photovoltaic technologies, have been widely interested and studied for years owing to their advantages including low cost in fabrication and low pollution in use. So far, the n-type TiO2-based DSSCs perform the best efficiency of 13%. In theory, p-type DSSCs work as efficient as n-type ones. However, the development of the p-type DSSCs has been much lagged behind that of n-type DSSCs due to the lack of ideal p-type semiconductors with optimum wide bandgap and suitably low valence band level. Accordingly, we report to use the hydrothermally synthesized CuGaO2 nanoplates for p-type DSSCs instead of typical NiO. The influences of their size, structures and use of different dyes on the DSSC efficiency are investigated and discussed. In addition to the application in DSSCs, CuGaO2 play a good light harvester which can be used for photocatalysis as well. In particular, the flat plates of CuGaO2 we made own the max exposure of active crystal faces that benefits the surface reactions. In the second part of the thesis, the CuGaO2 nanoplates are physically blended with carbon nitride (CN) sheets to form an active heterojunction toward water reduction (H2 evolution). In this investigation, the ways for physical blending, weight loading of CuGaO2 on CN and durability test of H2 production are examined.
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