Challenges of Current Applications on WS2 Nanomaterials

Tungsten disulfide nanoparticles image

The current applications on WS2 nanomaterials still face challenges and should be investigated in depth in the following aspects. Firstly, the study mechanism of HER needs to be deepened and clarified in terms of the fundamental properties of WS2. Advanced characterization methods, such as in situ techniques, can be combined to analyze the structural changes of the material during the catalytic process and reveal the catalytic process of WS2-based nanomaterials, especially electrocatalysis.

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Tungsten Disulfide for Electrode Materials of Supercapacitor

Electrochemical impedance spectroscopy spectra and diffusivity of lithium ions image

Recently, researchers demonstrated a specific capacitance of 398.5 F.g-1 for sheet tungsten disulfide anode materials. However, the performance of these materials remains unsatisfactory. Encouragingly, Nagaraju et al. synthesized WS2 nanoparticles used as supercapacitor electrode materials, which provided a high capacitance value of 1439.5 F.g-1 at a current density of 5 mA.cm-2 and maintained excellent cycling stability of 77.4% after 3000 cycles. This result suggests that WS2 can be considered a promising candidate for supercapacitor electrode materials.

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Low-temperature Sintering Tungsten-nickel-antimony Heavy Alloy

 SEM images of the powders- W, Ni, and Sb
Tungsten heavy alloys (WHA) are two-phase alloys that contain various compositions, microstructures, and performance tradeoffs. These alloys typically contain 88-97% by weight tungsten grains and nickel-iron, nickel-manganese, nickel-copper, and nickel-cobalt matrices. Due to their high density of 17 to 19 g/cm3, these alloys are frequently used in inertial applications including golf club weights, self- winding watch weights, aircraft wing weights, cellular telephone vibrators, munitions, and oilfield rejuvenation projectiles. Other applications include X-ray and radiation shields, and plasma and nuclear protection devices. 

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Tungsten Disulfide in Applications of Sodium-Ion Batteries

Electrochemical cyclability tests and HR-TEM of the WS2-r-GO and Sx-WS2-r-GO electrodes image

Tungsten disulfide possesses a much larger interlayer spacing of 0.62 nm than that of graphite (0.34 nm). This would be very favorable for the reversible process of Na+ intercalation/de-intercalation, making WS2 a promising anode material for sodium-ion batteries (SIBs). For example, Liu et al. reported WS2 nanowires (NWs) with an expanded interlayer spacing of 0.83 nm.

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Applications of WS2 Nanomaterials in Batteries

Superior photocatalytic activity of tungsten disulfide nanostructures image

As potential high-capacity anode materials for Lithium-ion batteries (LIBs), TMDCs have gained considerable attention, especially WS2 nanomaterials, which exhibit a higher theoretical specific capacity (433 mAh.g-1) than commercial graphite due to the 2D layer structure and the large platelet space. When used as an anode for lithium-ion batteries, WS2 exhibits an increasing lithium storage capacity. For example, Liu et al. prepared an ordered mesoporous WS2 as an anode for LIBs, which showed a high lithium storage capacity of 805 mAh.g-1 at a current of 0.1A.g-1.

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