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SnS 2 Nanoplates with Specific Facets Exposed for Enhanced Visible‐Light‐Driven Photocatalysis
Author(s) -
Huang Erwei,
Yao Xiaolong,
Wang Weichao,
Wu Guangjun,
Guan Naijia,
Li Landong
Publication year - 2017
Publication title -
chemphotochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.13
H-Index - 18
ISSN - 2367-0932
DOI - 10.1002/cptc.201600026
Subject(s) - photocatalysis , x ray photoelectron spectroscopy , rhodamine b , materials science , raman spectroscopy , water splitting , photocurrent , visible spectrum , spectroscopy , photochemistry , schottky barrier , hydrogen production , nanotechnology , hydrogen , chemical engineering , catalysis , chemistry , optoelectronics , optics , physics , biochemistry , organic chemistry , quantum mechanics , diode , engineering
A facile hydrothermal strategy is developed for the synthesis of SnS 2 nanoplates with specific exposed facets. The crystallographic structure and the specific exposed facets of as‐prepared SnS 2 are confirmed by X‐ray diffraction, Raman spectroscopy and TEM analysis, and the surface electronic state and the chemical composition of samples are investigated by X‐ray photoelectron spectroscopy (XPS). The band gaps of SnS 2 nanoplates are directly measured from UV/Vis absorption spectra, and their detailed band alignments are determined by Mott–Schottky plots and ultraviolet photoelectron spectroscopy (UPS) analysis, which are well supported by DFT calculations. Significant transient photocurrent responses under visible‐light irradiation from photoelectrochemical analysis reveal that SnS 2 samples are active and stable visible‐light‐driven photocatalysts and that SnS 2 nanoplates dominated by {101} exposed facets should be better photocatalysts than those dominated by {100} exposed facets. The photocatalytic activities of SnS 2 nanoplates are examined in two typical reactions, that is, rhodamine B (RhB) degradation and hydrogen production from water splitting. As expected, SnS 2 nanoplates dominated by {101} exposed facets exhibit distinctly higher activity than those dominated by {100} exposed facets in the photocatalytic RhB degradation. For hydrogen production from water splitting, SnS 2 nanoplates dominated by {101} exposed facets exhibit significant photocatalytic activity resulting from their suitable band edges to realize the photocatalytic redox reaction, in great contrast to the inactive SnS 2 nanoplates dominated by {100} exposed facets.