Enhanced interfacial charge transfer on strain-induced 2D-1D/MoS2-TiO2 heterostructures for electrochemical and photocatalytic applications

Two-dimensional (2D)/one dimensionsal (1D)-MoS2/TiO2 heterostructures have proven to be potent for photocatalytic applications. Enhancement of a heterostructure’s photocatalytic activity may be influenced by the accumulation of strain at the interface, which affects the interfacial interaction. Keeping this in mind, the present paper reports strain-accumulated interfacial modification of 2D/1D-MoS2/TiO2 heterostructures for the enhancement of photocatalytic activity. Two different synthesis methods, namely the hydrothermal and chemical vapor deposition (CVD) methods, are used for the growth of MoS2 on TiO2 nanostructures. Micro-Raman spectroscopy reveals that strain is accumulated at the interface of the growth of the MoS2 over the TiO2 nanostructures. It is further revealed that the MoS2/TiO2 heterostructure synthesized by the CVD method induces compressive strain. Also, the heterostructure synthesized by the hydrothermal method induces tensile strain that modifies the charge separation at the interface, which is further confirmed by x-ray photoelectron spectroscopy (XPS). Moreover, ultraviolet photoelectron spectroscopy (UPS) reveals upward band-bending in the MoS2/TiO2 heterostructure synthesized by the hydrothermal method. Similarly, the heterostructure synthesized by the CVD method shows downward band-bending that leads to improved charge separation at the interface. The modified interfaces of the heterostructures are further studied for electrochemical measurements using cyclic voltammetry (CV) and photocatalytic activity by degradation of a model compound.

[1]  Jianjian Lin,et al.  Preparation of Heterostructured TiO2/MoS2 for Efficient Photocatalytic Rhodamine B Degradation , 2022, Materials Advances.

[2]  G. Dalapati,et al.  Interfacial interaction of plasmonic nanoparticles (Ag, Au) decorated floweret TiO2 nanorod hybrids for enhanced visible light driven photocatalytic activity , 2021 .

[3]  S. Ogale,et al.  2D materials and their heterostructures for photocatalytic water splitting and conversion of CO2 to value chemicals and fuels , 2021 .

[4]  S. Rawat,et al.  Effect of nanotube diameter on the photocatalytic activity of bimetallic AgAu nanoparticles grafted 1D-TiO2 nanotubes , 2021, Journal of Materials Science: Materials in Electronics.

[5]  J. S. Ponraj,et al.  Facile synthesis and defect optimization of 2D-layered MoS2 on TiO2 heterostructure for industrial effluent, wastewater treatments , 2020, Scientific Reports.

[6]  G. Dalapati,et al.  Mixed-Phase TiO2 Nanotube–Nanorod Hybrid Arrays for Memory-Based Resistive Switching Devices , 2020 .

[7]  S. Baral,et al.  Defect engineering in photocatalysis: formation, chemistry, optoelectronics, and interface studies , 2020 .

[8]  H. Sharma,et al.  Strain-induced bimetallic nanoparticles-TiO2 nanohybrids for harvesting light energy , 2020 .

[9]  Sumit Kumar,et al.  Photoemission spectroscopy study of structural defects in molybdenum disulfide (MoS2) grown by chemical vapor deposition (CVD). , 2019, Chemical communications.

[10]  Z. Fan,et al.  Current progress in developing metal oxide nanoarrays-based photoanodes for photoelectrochemical water splitting. , 2019, Science bulletin.

[11]  Zhichuan J. Xu,et al.  Electrical promotion of spatially photoinduced charge separation via interfacial-built-in quasi-alloying effect in hierarchical Zn2In2S5/Ti3C2(O, OH)x hybrids toward efficient photocatalytic hydrogen evolution and environmental remediation , 2019, Applied Catalysis B: Environmental.

[12]  Yongqi Wang,et al.  Hydrothermal synthesis of MoS2 nanosheet loaded TiO2 nanoarrays for enhanced visible light photocatalytic applications , 2019, RSC advances.

[13]  S. Sufian,et al.  One-Dimensional Titanium Dioxide and Its Application for Photovoltaic Devices , 2018, Titanium Dioxide - Material for a Sustainable Environment.

[14]  I. Danaee,et al.  Effect of Copper Alloying on Electro-Catalytic Activity of Nickel for Ethanol Oxidation in Alkaline Media. , 2018, Acta chimica Slovenica.

[15]  K. Ravichandran,et al.  Cost-effective fabrication of ZnO/g-C 3 N 4 composite film coated stainless steel meshes for visible light responsive photocatalysis , 2018 .

[16]  Zhanhu Guo,et al.  Role of Interfaces in Two-Dimensional Photocatalyst for Water Splitting , 2018 .

[17]  Kelley J. Rountree,et al.  A Practical Beginner’s Guide to Cyclic Voltammetry , 2017 .

[18]  Zhanhu Guo,et al.  Energy conversion technologies towards self-powered electrochemical energy storage systems: the state of the art and perspectives , 2017 .

[19]  D. Suh,et al.  Evolution of a high local strain in rolling up MoS2 sheets decorated with Ag and Au nanoparticles for surface-enhanced Raman scattering , 2017, Nanotechnology.

[20]  Yun Zhang,et al.  Enhanced CH4 yield by photocatalytic CO2 reduction using TiO2 nanotube arrays grafted with Au, Ru, and ZnPd nanoparticles , 2016, Nano Research.

[21]  P. Giri,et al.  Strain induced phase formation, microstructural evolution and bandgap narrowing in strained TiO2 nanocrystals grown by ball milling , 2016 .

[22]  B. Dong.  Facile Synthesis of MoS2 Modified TiO2 Nanospheres with Enhanced Photoelectrocatalytic activity , 2016 .

[23]  Yeonwoong Jung,et al.  One-Step Synthesis of MoS₂/WS₂ Layered Heterostructures and Catalytic Activity of Defective Transition Metal Dichalcogenide Films. , 2016, ACS nano.

[24]  G. Ho,et al.  Structural design of TiO2-based photocatalyst for H2 production and degradation applications , 2015 .

[25]  Yingjuan Xie,et al.  Hierarchical TiO2 photocatalysts with a one-dimensional heterojunction for improved photocatalytic activities , 2015, Nano Research.

[26]  L. Marks,et al.  Defects on Strontium Titanate , 2015 .

[27]  Cinzia Casiraghi,et al.  Raman modes of MoS2 used as fingerprint of van der Waals interactions in 2-D crystal-based heterostructures. , 2014, ACS nano.

[28]  U. Waghmare,et al.  Extraordinary attributes of 2-dimensional MoS2 nanosheets , 2014 .

[29]  Kan Wang,et al.  Lattice strain effects on the optical properties of MoS2 nanosheets , 2014, Scientific Reports.

[30]  H. Duan,et al.  Electrospinning directly synthesized metal nanoparticles decorated on both sidewalls of TiO2 nanotubes and their applications. , 2013, Nanoscale.

[31]  P. Jha,et al.  Lattice dynamics and Raman spectrum of rutile TiO 2 : The role of soft phonon modes in pressure induced phase transition , 2012 .

[32]  Yury Gogotsi,et al.  Phonon confinement effects in the Raman spectrum of nanodiamond , 2009 .

[33]  Wolfgang Kiefer,et al.  Recent Advances in linear and nonlinear Raman spectroscopy I , 2007 .

[34]  D. Grainger,et al.  X-ray photoelectron spectroscopy sulfur 2p study of organic thiol and disulfide binding interactions with gold surfaces , 1996 .