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Doping‐Induced Amorphization, Vacancy, and Gradient Energy Band in SnS 2 Nanosheet Arrays for Improved Photoelectrochemical Water Splitting
Author(s) -
Meng Linxing,
Wang Siyu,
Cao Fengren,
Tian Wei,
Long Run,
Li Liang
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201902411
Subject(s) - nanosheet , water splitting , doping , materials science , hydrothermal circulation , vacancy defect , oxygen evolution , band gap , crystallinity , chemical engineering , nanotechnology , chemical physics , optoelectronics , photocatalysis , chemistry , catalysis , electrochemistry , electrode , crystallography , biochemistry , composite material , engineering
Abstract Photoelectrochemical (PEC) water splitting is a promising strategy to convert solar energy into hydrogen fuel. However, the poor bulk charge‐separation ability and slow surface oxygen evolution reaction (OER) dynamics of photoelectrodes impede the performance. We construct In‐ and Zn/In‐doped SnS 2 nanosheet arrays through a hydrothermal method. The doping induces the simultaneous formation of an amorphous layer, S vacancies, and a gradient energy band. This leads to elevated carrier concentrations, an increased number of surface‐reaction sites, accelerated surface‐OER kinetics, and an enhanced bulk‐carrier separation efficiency with a decreased recombination rate. This efficient doping strategy allows to manipulate the morphology, crystallinity, and band structure of photoelectrodes for an improved PEC performance.