MnS coupled with ultrathin MoS^sub 2^ nanolayers as heterojunction photocatalyst for high photocatalytic and photoelectrochemical activities

Nano-MnS were coupled with ultrathin two-dimensional MoS2 nanolayers as heterojunction photocatalysts. The well heterojunction contact can be confirmed by high resolution TEM images. The heterojunction composites display higher absorption intensity of visible light and the S XPS peaks show obvious s...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 771; p. 364
Main Authors Chen, Xuan, Zhang, Jun, Zeng, Jinghui, Shi, Yuxuan, Lin, Songyun, Huang, Guozhou, Wang, Hongbo, Kong, Zhe, Xi, Junhua, Ji, Zhenguo
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier BV 15.01.2019
Subjects
Catalytic activity
Conduction bands
Electrons
Heterojunctions
Image resolution
Luminous intensity
Molybdenum disulfide
Nanoparticles
Photocatalysis
Photocatalysts
Photoelectric effect
Photoelectric emission
Semiconductors
Thin films
Valence band
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Summary:Nano-MnS were coupled with ultrathin two-dimensional MoS2 nanolayers as heterojunction photocatalysts. The well heterojunction contact can be confirmed by high resolution TEM images. The heterojunction composites display higher absorption intensity of visible light and the S XPS peaks show obvious shift. Compared with pristine MnS, this MnS/MoS2 heterojunction exhibited vast enhancement in photocatalytic and photoelectrochemical performance. The heterojunction composite with highest activity displayed 161% enhancement in photocatalytic activity, 2.6–11.5 times increase of photocurrent density. This vast improvement can be assigned to the energy band matching of MnS/MoS2 heterojunction. Both the conduction band and valence band of MnS are more negative than those of MoS2, the photo-induced electrons at the conduction band of MnS will transfer into the conduction band of MoS2 while the photo-induced holes at the valence band of MoS2 will transfer into the valence band of MnS. In this way, the photo-produced carriers will flow into different semiconductors and the carriers' separation efficiency is enhanced. The work develops a new approach to improve the heterojunction property for photocatalytic and photoelectrochemical application.
ISSN:0925-8388
1873-4669