WS2 Hybrid Structures

Rate performances at various current densities and EIS spectra-cycling stability image

In WS2 hybrid structures, atomic doping is one of the effective ways to change the physical and chemical properties of the material, such as band gap and optical properties. For example, Sasaki et al. demonstrated that the exciton absorption peaks at 1.94 and 2.34 eV, respectively, were broadened by Nb doping. This suggests that excitons in WS2 monolayers are sensitive to Nb doping because of the enhancement of the inhomogeneous broadening rate.

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IF-WS2 and NT-WS2 of WS2 Nanomaterials and Preparation

CV curves of the first three cycles for the WG electrode and first three galvanostatic charge-discharge profiles of the WG composite image

Various forms of WS2 nanomaterials include nanosheets, IF-WS2, NT-WS2, and other forms. Chemical gas-solid reactions are the most well-known and established method for the synthesis of IF WS2 nanoparticles and nanotubes. Tenne et al. initially synthesized IF WS2 nanoparticles and nanotubes using WO3 films and H2S in a reducing atmosphere (95% N2 + 5% H2) at 850 °C. However, only a small amount of products could be synthesized by this method.

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Controlled Synthesis of Tungsten Disulfide Nanomaterials

Polarization curves and corresponding Tafel plots of bulk of WS2 WS2 nanofakes and WS2 nanorattles image

1T-WS2 structure and 2H-WS2 structure of tungsten disulfide nanomaterials controlled synthesis is important. The 1T-WS2 structure is considered an efficient co-catalyst for hydrogen evolution due to the increased density of catalytic active sites and the metal conductivity, while the 2H-WS2 structure can be used as a visible photosensitizer. Therefore, various synthetic methods for the crystalline phase modulation of WS2 have received much attention. Since the conversion from 1T-WS2 to stable 2H-WS2 can be easily achieved by annealing, the study of feasible methods to achieve the opposite conversion has received much attention.

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Most Common Form of Tungsten Disulfide Nanomaterials: Nanosheets

Polarization curves of WS2-RGO hybrid nanosheets and corresponding Tafel plots recorded on glassy carbon electrodes image

Nanosheets of tungsten disulfide nanomaterials are the most common form, and the main synthetic strategies can be divided into two categories: top-down and bottom-up approaches. Top-down approaches allow the production of small amounts or single-layer samples at a lower cost, which is very beneficial for basic research. Among these top-down methods, mechanical peeling via Scotch tape is the simplest method, with only a few or single layers of WS2 exfoliated via Scotch tape.

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Electrical Characteristic and HER Mechanism of Tungsten Disulfide Nanomaterials

Schematic illustration of the forming process of WS2 samples with different morphologies image

Due to the promising applications of tungsten disulfide nanomaterials in the field of energy conversion and storage, efforts have been made to study and improve its electrical characteristic and HER mechanism of WS2, such as carrier concentration (p), mobility (μ), and resistivity (ρ). According to theoretical predictions, WS2 has the highest electron mobility in semiconductor TMDCs due to the reduced effective mass.

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