Gradient FeOx(PO4)(y) Layer on Hematite Photoanodes: Novel Structure for Efficient Light-Driven Water Oxidation

doi:10.1021/am502821d

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	Gradient FeOx(PO4)(y) Layer on Hematite Photoanodes: Novel Structure for Efficient Light-Driven Water Oxidation
	Zhang, Yuchao 1; Zhou, Zichao 1; Chen, Chuncheng 1; Che, Yanke 1; Ji, Hongwei 1; Ma, Wanhong 1; Zhang, Jing 2; Song, Dongyan 2; Zhao, Jincai 1
刊名	ACS APPLIED MATERIALS & INTERFACES
	2014-08-13
卷号	6 期号:15 页码:12844-12851
关键词	Hematite Gradient Feox(Po4)(y) Water Oxidation Hole Diffusion Length
ISSN号	1944-8244
DOI	10.1021/am502821d
英文摘要	Hematite has been receiving increasing attention for its application in photoelectrochemical (PEC) water oxidation but usually exhibits poor efficiency. We fabricated a stable gradient-structured FeOx(PO4)(y) layer on hematite by diffusively incorporating phosphate onto the surface layer of hematite films at a low temperature. X-ray photoelectron spectroscopy depth profile and Fe K-edge grazing-incidence X-ray absorption near-edge structure and extended X-ray absorption fine structure analysis demonstrated the formation of a similar to 50 nm overlayer with a gradient phosphorus distribution and structural evolution from the outer surface to the depth. The as-prepared photoanodes showed highly improved PEG water oxidation performance. Up to 8.5-fold enhancement in the photocurrent density at 1.23 V versus reversible hydrogen electrode was achieved relative to the pristine anode. This strategy is applicable for hematite photoanodes prepared by different methods and with different morphologies and structures. The improvement in the water oxidation activity is mainly attributed to the enhanced separation of photogenerated electron-hole pairs, which is derived from the increased hole diffusion length in the gradient-structured overlayer. This work develops a simple and universal method to boost the PEC water oxidation efficiency with versatile hematite photoanodes.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000340446300123
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/50487]
专题	中国科学院化学研究所
通讯作者	Chen, Chuncheng
作者单位	1.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Key Lab Photochem, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Inst High Energy Phys, BSRF, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yuchao,Zhou, Zichao,Chen, Chuncheng,et al. Gradient FeOx(PO4)(y) Layer on Hematite Photoanodes: Novel Structure for Efficient Light-Driven Water Oxidation[J]. ACS APPLIED MATERIALS & INTERFACES,2014,6(15):12844-12851.
APA	Zhang, Yuchao.,Zhou, Zichao.,Chen, Chuncheng.,Che, Yanke.,Ji, Hongwei.,...&Zhao, Jincai.(2014).Gradient FeOx(PO4)(y) Layer on Hematite Photoanodes: Novel Structure for Efficient Light-Driven Water Oxidation.ACS APPLIED MATERIALS & INTERFACES,6(15),12844-12851.
MLA	Zhang, Yuchao,et al."Gradient FeOx(PO4)(y) Layer on Hematite Photoanodes: Novel Structure for Efficient Light-Driven Water Oxidation".ACS APPLIED MATERIALS & INTERFACES 6.15(2014):12844-12851.