Surface electronic structure reconfiguration of hematite nanorods for efficient photoanodic water oxidation

doi:10.1002/solr.201900349

淡江大學機構典藏 > 工學院 > 電機工程學系暨研究所 > 期刊論文 > Item 987654321/125741

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題名:	Surface electronic structure reconfiguration of hematite nanorods for efficient photoanodic water oxidation
作者:	Yanming Fu, Ying-Rui Lu, Feng Ren, Zhuo Xing, Jie Chen, Penghui Guo, Way-Faung Pong, Chung-Li Dong, Liang Zhao, Shaohua Shen
日期:	2020-01
上傳時間:	2024-07-31 12:11:22 (UTC+8)
出版者:	Wiley-VCH
摘要:	Hematite (α-Fe2O3) is a promising candidate as a semiconducting photoanode for photoelectrochemical (PEC) water splitting. However, its PEC performance is much limited by the sluggish charge transfer kinetics at the α-Fe2O3/electrolyte interface. Herein, an insulative metal oxide, hafnium dioxide (HfO2), is deposited on the surface of α-Fe2O3 to engineer the photoelectrode/electrolyte interfacial electronic structure. With the conformal HfO2 overlayer coating, the surface defects of α-Fe2O3 are effectively passivated, whereas the charge migration from α-Fe2O3 to the electrolyte is blocked by the continuous HfO2 overlayer, leading to a moderate PEC enhancement. In contrast, with HfO2 nanoparticles deposited, the photogenerated holes are not only effectively extracted from the bulk of α-Fe2O3 but are also promptly injected into the electrolyte for water oxidation, due to the reconfigurated surface electronic structure. Consequently, the HfO2 nanoparticles-decorated α-Fe2O3 photoanode achieves an onset potential cathodic shift by 180 mV and a 460% photocurrent density enhancement, reaching up to 1.20 mA cm−2 at 1.23 V versus reversible hydrogen electrode as compared with pristine α-Fe2O3. An alternative approach to engineer the photoelectrode/electrolyte interfacial electronic structure to improve the PEC performance for water splitting is demonstrated herein.
關聯:	Solar RRL 4(1), 1900349
DOI:	10.1002/solr.201900349
顯示於類別:	[電機工程學系暨研究所] 期刊論文

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