气候变化领域集成服务门户(CCPortal): Grey hematite photoanodes decrease the onset potential in photoelectrochemical water oxidation

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DOI	10.1016/j.scib.2021.02.016
	Grey hematite photoanodes decrease the onset potential in photoelectrochemical water oxidation
	Liu P.-F.; Wang C.; Wang Y.; Li Y.; Zhang B.; Zheng L.-R.; Jiang Z.; Zhao H.; Yang H.-G.
发表日期	2021
ISSN	20959273
起始页码	1013
结束页码	1021
卷号	66 期号:10
英文摘要	Photoelectrochemical (PEC) water splitting for solar energy conversion into chemical fuels has attracted intense research attention. The semiconductor hematite (α-Fe2O3), with its earth abundance, chemical stability, and efficient light harvesting, stands out as a promising photoanode material. Unfortunately, its electron affinity is too deep for overall water splitting, requiring additional bias. Interface engineering has been used to reduce the onset potential of hematite photoelectrode. Here we focus instead on energy band engineering hematite by shrinking the crystal lattice, and the water-splitting onset potential can be decreased from 1.14 to 0.61 V vs. the reversible hydrogen electrode. It is the lowest record reported for a pristine hematite photoanode without surface modification. X-ray absorption spectroscopy and magnetic properties suggest the redistribution of 3d electrons in the as-synthesized grey hematite electrode. Density function theory studies herein show that the smaller-lattice-constant hematite benefits from raised energy bands, which accounts for the reduced onset potential. © 2021 Science China Press
关键词	Energy band Hematite Onset potential Photoelectrochemical water oxidation Spin states
英文关键词	Band structure; Chemical stability; Electrodes; Electron affinity; Energy conversion; Lattice theory; Photoelectrochemical cells; Solar energy; X ray absorption spectroscopy; Density function theory; Energy band engineering; Hematite photoanode; Interface engineering; Photoanode materials; Photoelectrochemical water oxidation; Photoelectrochemicals; Reversible hydrogen electrodes; Hematite
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207492
作者单位	Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China; Centre for Clean Environment and Energy, Griffith University, Gold Coast CampusQLD 4222, Australia; State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science and Laboratory of Advanced Materials, Fudan University, Shanghai, 200438, China; Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China; Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China
推荐引用方式 GB/T 7714	Liu P.-F.,Wang C.,Wang Y.,et al. Grey hematite photoanodes decrease the onset potential in photoelectrochemical water oxidation[J],2021,66(10).
APA	Liu P.-F..,Wang C..,Wang Y..,Li Y..,Zhang B..,...&Yang H.-G..(2021).Grey hematite photoanodes decrease the onset potential in photoelectrochemical water oxidation.Science Bulletin,66(10).
MLA	Liu P.-F.,et al."Grey hematite photoanodes decrease the onset potential in photoelectrochemical water oxidation".Science Bulletin 66.10(2021).