| Summary: | 碩士 === 逢甲大學 === 材料科學與工程學系 === 104 === In this research, high specific surface area bipyramidal and pseudocubic polyhedral α-Fe2O3 nanocrystals were fabricated for hydrogen reduction in water splitting process with 532 nm laser irradiation. Two different facet of polyhedral α-Fe2O3 nanocrystals were fabricated via a facile hydrothermal routes. The photocatalytic activity of hematite is limited by relatively poor absorptivity, very short excited-state lifetime, and a short hole diffusion length. To address the limitation, the intrinsic charge spatial distribution has to be taken into account when selecting the facets, as it results in accumulation of photoexcited electrons and holes on certain semiconductor facets.
Futhermore, the Zn dopant and gold (Au) plasmonic nanoparticles were participate with the p-n junction and Schottky junction in this charge spatial distribution Fe2O3 system, which synthesized by coprecipitation and plasma sputtering deposition. The detail enhanced mechanism of these composite Fe2O3 photoelectrodes were systematically investigated by using different structural configurations and light sources in photocatalytic water splitting. Subsequently, the water splitting photocurrent of Au/pseudocubic Fe2O3 photoelectrode can achieve 7.01 mA/cm2 in 1M NaOH at 0.8 V.
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