NDLI: Hydrogen-treated hematite nanostructures with low onset potential for highly efficient solar water oxidation

Content Provider	Royal Society of Chemistry (RSC)
Author	Pu, Aiwu Zhang, Hui Li, Ming Hao, Yuanyuan Zhong, Jun Deng, Jiujun Gao, Jing Sun, Xuhui Zhang, Pingping
Copyright Year	2014
Abstract	Hydrogen-treated hematite nanostructures were prepared by a simple pyrolysis of NaBH4 in a crucible. The H2-treated hematite photoelectrode showed high efficiency for solar water oxidation with a photocurrent of 2.28 mA cm−2 at 1.23 V vs. RHE, which was over 2.5 times higher than that for pristine hematite (0.88 mA cm−2). The significant improvement of the photocurrent can be attributed to increased oxygen vacancies after the H2 treatment. Moreover, the onset potential for H2-treated hematite was low and when compared to the hematite photoelectrode treated in an oxygen-deficient atmosphere to produce oxygen vacancies, a cathodic shift of the onset potential was observed by about 120 mV (from 0.99 to 0.87 V vs. RHE). The cathodic shift of the onset potential was attributed to the surface effect of H2 treatment while the oxygen-deficiency treatment mainly affected the bulk, which was confirmed by X-ray absorption spectroscopy. The results also suggest that the presence of surface defect states of Fe2+ in hematite is not the reason for high onset potential described in the literature. The H2-treated hematite with high efficiency could be used as a good starting material to achieve better performance for practical applications with further modifications such as surface catalysts or elemental doping.
Starting Page	6727
Ending Page	6733
Page Count	7
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	2
Issue Number	19
Journal	Journal of Materials Chemistry A
DOI	10.1039/c4ta00729h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	RHE Hematite Pyrolysis Sodium borohydride Photocurrent Oxygen X-ray absorption spectroscopy Absorption spectroscopy Dopant
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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