| Summary: | 碩士 === 逢甲大學 === 材料科學與工程學系 === 103 === This study introduced a new composite photoelectrode plasmonic
metal nanoparticles (NPs) - titanium dioxide (TiO2) - ordered mesoporous
carbon material (CMK-3) for water splitting application. TiO2 and
CMK-3 were successfully fabricated by using facile solution-based
process and hard template method, followed by the plasmonic metal
deposition process. The optimal mixing ratio of TiO2-CMK-3
photoelectrode was determined by the photocurrent response during the
water splitting process. Remarkably, CMK-3 not only enhanced incident
photon capture rate but also improved mass transfer effect for the
electrolyte at the surface of photoelectrode. Consequently, two orders of
magnitude of the enhanced water splitting photocurrent was obtained in
the TiO2-CMK-3 composite photoelectrode with respect to TiO2 only
under 532 nm laser irradiation.
Furthermore, with the integration of gold (Au) and silver (Ag)
plasmonic nanoparticles, water-splitting photocurrents were significantly
improved due to strong light scattering and near fields from the surface
plasmon resonance metal NPs. The detail enhanced mechanism of these composite plasmonic photoelectrodes were systematically investigated by using different structural configurations and light sources. Finally, we also demonstrated spatially resolved mapping photocurrents in this work for the potential large area fabrication.
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