MnS coupled with ultrathin MoS2 nanolayers as heterojunction photocatalyst for high photocatalytic and photoelectrochemical activities

Abstract 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.

[1]  S. Luo,et al.  Vertical single or few-layer MoS2 nanosheets rooting into TiO2 nanofibers for highly efficient photocatalytic hydrogen evolution , 2015 .

[2]  Dongdong Wang,et al.  Fast electron transfer and enhanced visible light photocatalytic activity using multi-dimensional components of carbon quantum dots@3D daisy-like In2S3/single-wall carbon nanotubes , 2017 .

[3]  Z. Ji,et al.  Novel dual heterojunction between MoS2 and anatase TiO2 with coexposed {101} and {001} facets , 2017 .

[4]  T. Peng,et al.  Two Different Roles of Metallic Ag on Ag/AgX/BiOX (X = Cl, Br) Visible Light Photocatalysts: Surface Plasmon Resonance and Z-Scheme Bridge , 2012 .

[5]  J. Carpena-Núñez,et al.  Single-crystal γ-MnS nanowires conformally coated with carbon. , 2014, ACS applied materials & interfaces.

[6]  Jun Liu,et al.  In Situ Synthesis of MnS Hollow Microspheres on Reduced Graphene Oxide Sheets as High-Capacity and Long-Life Anodes for Li- and Na-Ion Batteries. , 2015, ACS applied materials & interfaces.

[7]  J. Contour,et al.  Effects of nitrogen dioxide and water vapor on oxidation of sulfur dioxide over vanadium pentoxide particles , 1978 .

[8]  Z. Ji,et al.  Curved surface TiO2 nanodrums coupled with MoS2 as heterojunction photocatalysts with enhancing photocatalytic activity , 2018, Materials Letters.

[9]  A. Fujishima,et al.  TiO2 photocatalysis and related surface phenomena , 2008 .

[10]  Huaidong Jiang,et al.  Few-layered MoS2 nanosheets wrapped ultrafine TiO2 nanobelts with enhanced photocatalytic property. , 2016, Nanoscale.

[11]  Xin-an Yang,et al.  Fabrication of g-C3N4/SnS2/SnO2 nanocomposites for promoting photocatalytic reduction of aqueous Cr(VI) under visible light , 2018 .

[12]  Hua Xu,et al.  Preparation and formation process of α-MnS@MoS2 microcubes with hierarchical core/shell structure. , 2017, Journal of colloid and interface science.

[13]  R. Sodhi,et al.  KLL Auger and core-level (1s and 2p) photoelectron shifts in a series of gaseous phosphorus compounds , 1983 .

[14]  L. Gong,et al.  Self-Assembled Three-Dimensional Graphene-Based Aerogel with Embedded Multifarious Functional Nanoparticles and Its Excellent Photoelectrochemical Activities , 2014 .

[15]  Zhigang Chen,et al.  Construction of a 2D Graphene-Like MoS2/C3N4 Heterojunction with Enhanced Visible-Light Photocatalytic Activity and Photoelectrochemical Activity. , 2016, Chemistry.

[16]  Xiaobo Chen,et al.  Titanium dioxide nanomaterials: synthesis, properties, modifications, and applications. , 2007, Chemical reviews.

[17]  J. Zhong,et al.  2D co-catalytic MoS2 nanosheets embedded with 1D TiO2 nanoparticles for enhancing photocatalytic activity , 2016 .

[18]  Xiaobo Chen,et al.  Semiconductor-based photocatalytic hydrogen generation. , 2010, Chemical reviews.

[19]  Z. Ji,et al.  A study of constructing heterojunction between two-dimensional transition metal sulfides (MoS 2 and WS 2 ) and (101), (001) faces of TiO 2 , 2018 .

[20]  Jianfeng Shen,et al.  Fabrication of γ-MnS/rGO composite by facile one-pot solvothermal approach for supercapacitor applications , 2015 .

[21]  Z. Li,et al.  Highly efficient photocatalytic H2 evolution over MoS2/CdS-TiO2 nanofibers prepared by an electrospinning mediated photodeposition method , 2017 .

[22]  Can Li,et al.  Enhancement of photocatalytic H2 evolution on CdS by loading MoS2 as Cocatalyst under visible light irradiation. , 2008, Journal of the American Chemical Society.

[23]  W. Zhou,et al.  Fabrication of 3D flower-like black N-TiO2-x@MoS2 for unprecedented-high visible-light-driven photocatalytic performance , 2017 .

[24]  Z. Ji,et al.  Anatase TiO2 nanosheets with coexposed {101} and {001} facets coupled with ultrathin SnS2 nanosheets as a face-to-face n-p-n dual heterojunction photocatalyst for enhancing photocatalytic activity , 2017 .

[25]  W. Shi,et al.  Enhanced visible light photocatalytic activity of alkaline earth metal ions-doped CdSe/rGO photocatalysts synthesized by hydrothermal method , 2015 .

[26]  Yuanhua Lin,et al.  Noble-metal-free MnS/In2S3 composite as highly efficient visible light driven photocatalyst for H2 production from H2S , 2017 .

[27]  Longlu Wang,et al.  Glucose-assisted synthesize 1D/2D nearly vertical CdS/MoS2 heterostructures for efficient photocatalytic hydrogen evolution , 2017 .

[28]  N. Zhang,et al.  One-dimensional CdS@MoS2 core-shell nanowires for boosted photocatalytic hydrogen evolution under visible light , 2017 .

[29]  Zhigang Chen,et al.  Different Morphologies of SnS2 Supported on 2D g-C3N4 for Excellent and Stable Visible Light Photocatalytic Hydrogen Generation , 2018 .

[30]  Z. Ji,et al.  Crystal face regulating MoS2/TiO2(001) heterostructure for high photocatalytic activity , 2016 .

[31]  Daniel G Nocera,et al.  Hydrogen production by molecular photocatalysis. , 2007, Chemical reviews.

[32]  Hui Zhao,et al.  In situ light-assisted preparation of MoS2 on graphitic C3N4 nanosheets for enhanced photocatalytic H2 production from water , 2015 .

[33]  Y. Gong,et al.  One-step synthesis of MnS/MoS2/C through the calcination and sulfurization of a bi-metal-organic framework for a high-performance supercapacitor and its photocurrent investigation. , 2018, Dalton transactions.

[34]  Ling Zhang,et al.  Photocatalytic robust solar energy reduction of dinitrogen to ammonia on ultrathin MoS2 , 2017 .

[35]  Mietek Jaroniec,et al.  Synergetic effect of MoS2 and graphene as cocatalysts for enhanced photocatalytic H2 production activity of TiO2 nanoparticles. , 2012, Journal of the American Chemical Society.

[36]  Z. Ji,et al.  Constructing two-dimension MoS2/Bi2WO6 core-shell heterostructure as carriers transfer channel for enhancing photocatalytic activity , 2017 .

[37]  Joon-Yeob Lee,et al.  Synthesis of MoS2 nanosheets loaded ZnO–g-C3N4 nanocomposites for enhanced photocatalytic applications , 2016 .

[38]  Yuliang Zhao,et al.  The big red shift of photoluminescence of Mn dopants in strained CdS: a case study of Mn-doped MnS-CdS heteronanostructures. , 2010, Journal of the American Chemical Society.

[39]  Ying Ma,et al.  One-pot synthesis of 3D flower-like heterostructured SnS2/MoS2 for enhanced supercapacitor behavior , 2015 .

[40]  F. Wen,et al.  SnS2 Nanoflakes Anchored Graphene obtained by Liquid Phase Exfoliation and MoS2 Nanosheet Composites as Lithium and Sodium Battery Anodes , 2017 .

[41]  Shaomin Liu,et al.  Facile assembly of Bi2O3/Bi2S3/MoS2n-p heterojunction with layered n-Bi2O3 and p-MoS2 for enhanced photocatalytic water oxidation and pollutant degradation , 2017 .

[42]  Jinkui Feng,et al.  Rationally Incorporated MoS2/SnS2 Nanoparticles on Graphene Sheets for Lithium-Ion and Sodium-Ion Batteries. , 2017, ACS applied materials & interfaces.

[43]  Z. Ji,et al.  Constructing a Novel n–p–n Dual Heterojunction between Anatase TiO2 Nanosheets with Coexposed {101}, {001} Facets and Porous ZnS for Enhancing Photocatalytic Activity , 2017 .