Grey hematite photoanodes decrease the onset potential in photoelectrochemical water oxidation

作     者：Peng-Fei Liu Chongwu Wang Yun Wang Yuhang Li Bo Zhang Li-Rong Zheng Zheng Jiang Huijun Zhao Hua-Gui Yang 刘鹏飞;王重午;王云;李宇航;张波;郑黎荣;姜政;赵惠军;杨化桂

作者机构：Key Laboratory for Ultrafine Materials of Ministry of EducationShanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China Centre for Clean Environment and EnergyGriffith UniversityGold Coast CampusQLD 4222Australia State Key Laboratory of Molecular Engineering of PolymersDepartment of Macromolecular Science and Laboratory of Advanced MaterialsFudan UniversityShanghai 200438China Beijing Synchrotron Radiation FacilityInstitute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Shanghai Synchrotron Radiation FacilityShanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2021年第66卷第10期

页      面：1013-1021,M0004页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：financially supported by the National Natural Science Funds for Distinguished Young Scholars (51725201) the International (Regional) Cooperation and Exchange Projects of the National Natural Science Foundation of China (51920105003) the Innovation Program of Shanghai Municipal Education Commission (E00014) the National Natural Science Foundation of China (51902105) the Shanghai Engineering Research Center of Hierarchical Nanomaterials (18DZ2252400) the Shanghai Sailing Program (19YF1411600) 

主　　题：Hematite Photoelectrochemical water oxidation Onset potential Spin states Energy band 

摘      要：Photoelectrochemical(PEC)water splitting for solar energy conversion into chemical fuels has attracted intense research *** semiconductor hematite(α-Fe_(2)O_(3)),with its earth abundance,chemical stability,and efficient light harvesting,stands out as a promising photoanode ***,its electron affinity is too deep for overall water splitting,requiring additional *** engineering has been used to reduce the onset potential of hematite *** 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 *** reversible hydrogen *** 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 *** function theory studies herein show that the smaller-lattice-constant hematite benefits from raised energy bands,which accounts for the reduced onset potential.