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Ultrathin Visible‐Light‐Driven Mo Incorporating In 2 O 3 –ZnIn 2 Se 4 Z‐Scheme Nanosheet Photocatalysts
Author(s) -
Chao Yuguang,
Zhou Peng,
Li Na,
Lai Jianping,
Yang Yong,
Zhang Yelong,
Tang Yonghua,
Yang Wenxiu,
Du Yaping,
Su Dong,
Tan Yisheng,
Guo Shaojun
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201807226
Subject(s) - nanosheet , photocatalysis , materials science , photoluminescence , x ray photoelectron spectroscopy , dielectric spectroscopy , spectroscopy , photocurrent , visible spectrum , nanotechnology , photochemistry , electrochemistry , chemical engineering , optoelectronics , catalysis , chemistry , physics , electrode , organic chemistry , quantum mechanics , engineering
Inspired by natural photosynthesis, the design of new Z‐scheme photocatalytic systems is very promising for boosting the photocatalytic performance of H 2 production and CO 2 reduction; however, until now, the direct synthesis of efficient Z‐scheme photocatalysts remains a grand challenge. Herein, it is demonstrated that an interesting Z‐scheme photocatalyst can be constructed by coupling In 2 O 3 and ZnIn 2 Se 4 semiconductors based on theoretical calculations. Experimentally, a class of ultrathin In 2 O 3 –ZnIn 2 Se 4 (denoted as In 2 O 3 –ZISe) spontaneous Z‐scheme nanosheet photocatalysts for greatly enhancing photocatalytic H 2 production is made. Furthermore, Mo atoms are incorporated in the Z‐scheme In 2 O 3 –ZISe nanosheet photocatalyst by forming the MoSe bond, confirmed by X‐ray photoelectron spectroscopy, in which the formed MoSe 2 works as cocatalyst of the Z‐scheme photocatalyst. As a consequence, such a unique structure of In 2 O 3 –ZISe–Mo makes it exhibit 21.7 and 232.6 times higher photocatalytic H 2 evolution activity than those of In 2 O 3 –ZnIn 2 Se 4 and In 2 O 3 nanosheets, respectively. Moreover, In 2 O 3 –ZISe–Mo is also very stable for photocatalytic H 2 production by showing almost no activity decay for 16 h test. Ultraviolet–visible diffuse reflectance spectra, photoluminescence spectroscopy, transient photocurrent spectra, and electrochemical impedance spectroscopy reveal that the enhanced photocatalytic performance of In 2 O 3 –ZISe–Mo is mainly attributed to its widened photoresponse range and effective carrier separation because of its special structure.