Exploitation of a spontaneous spatial charge separation effect in plasmonic polyhedral α-Fe2O3 nanocrystal photoelectrodes for hydrogen production

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Title:	Exploitation of a spontaneous spatial charge separation effect in plasmonic polyhedral α-Fe2O3 nanocrystal photoelectrodes for hydrogen production
Authors:	洪緯璿;Hung, Wei-Hsuan;Peng, Chien-Jung;Yang, Chin-Ru;Li, Chia-Jui;Shyue, Jing-Jong;Chang, Pai-Chun;Tseng, Chuan-Ming;Juan, Pi-Chun
Contributors:	工學院材料科學與工程研究所
Keywords:	Charge Spatial Separation;H2 production;Hematite;SPR;Water Splitting
Date:	2016-12-01
Issue Date:	2026-04-23 11:34:31 (UTC+8)
Publisher:	Elsevier BV;Elsevier Ltd
Abstract:	摘要： High specific surface area bipyramidal and pseudocubic polyhedral α-Fe2O3 nanocrystals were fabricated for hydrogen reduction in a water-splitting process. Two different facets of polyhedral α-Fe2O3 nanocrystals were synthesized via a versatile hydrothermal route. Typically, photocatalytic activity of hematite is limited by its relatively poor absorptivity, very short excited-state lifetime, and short hole diffusion length. To address these issues, a pseudocubic polyhedral α-Fe2O3 photoelectrode was fabricated that achieved a spontaneous charge spatial separation during the water-splitting process. Additionally, Sn from the FTO substrate was diffused and doped into polyhedral α-Fe2O3 during the sintering process to serve as an electron donor and increase the carrier density. To further exploit the surface plasmon resonance (SPR) properties and enhance the water-splitting efficiency of polyhedral α-Fe2O3 photoelectrodes, Au nanoparticles were decorated on the surface of Fe2O3. This increased incident light absorption and suppressed charge recombination by the strong field generated from collective oscillations of surface electrons in the Au nanoparticles. Subsequently, this Au/pseudocubic Fe2O3 photoelectrode demonstrated a 9.05 μmol/min hydrogen production rate. The characterization of the pseudocubic Fe2O3. [Display omitted] •In this work, a practical strategy is proposed to facilitate the preferential migration of electrons and holes in semiconductors by using the work function differences on the different crystal facets.•Ultraviolet photoelectron spectroscopy (UPS) was used to measure the work function of the different crystal photoelectrode.•Interestingly, our study also observes Sn diffusion but at a relatively lower temperature of 450°C and proved with XPS concentration-depth profile.•For the further improvement, the plasmonic effect was also exploited by depositing a layer of Au NPs on the surface of pseudocubic polyhedral α-Fe2O3, which exhibited additional 27% enhancement. 出版者： Elsevier Ltd 出版日期： 2016-12 出處： Nano energy, 2016-12, Vol.30, p.523-530 版權： 2016 Elsevier Ltd 識別號： ISSN: 2211-2855 識別號： DOI: 10.1016/j.nanoen.2016.10.050
Appears in Collections:	[Institute of Materials Science and Engineering] journal & Dissertation

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