Title : Evaluation of binder-free transition metal di-sulfides for energy storage applications
Abstract:
The layered structure of tungsten disulfide (WS2) and molybdenum tungsten disulfide (MoWS2) are highly sought for possible energy storage applications. We used magnetron sputtering and other wet chemical approach such as hydrothermal technique to synthesis and deposit WS2 and MoWS2 on nickel foam of varying thickness to attain an optimized layer thickness. Atomic force microscopy, scanning electron microscope and X-ray diffraction is used to study the material's structural and morphological characteristics. According to Brunauer-Emmett-Teller (BET) testing, the increase in surface area and pore volume after molybdenum addition indicates enhanced porosity. Three-electrode assembly was used to start with electrochemical investigations in order to identify the most optimal and effective sample among WS2, MoWS2, and other TMSs. Cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) analysis, and electro-impedance spectroscopy were used to examine the samples. After founding TMSs with optimized thickness as the superior performing sample a hybrid supercapacitor was fabricated as WS2//Activated carbon (AC). With an outstanding cyclic stability of 97% after 3000 GCD cycles, the hybrid device generated a maximum specific energy density (Es) of 42.5 Wh kg-1 and a 4250 W kg-1 power density (Ps). Moreover, Dunn’s model was simulated to elucidate the capacitive and diffusive contribution during charge discharge process and b-values were calculated that affirmed to the hybrid nature of fabricated WS2 hybrid device. The outstanding outcomes of WS2//AC makes it suitable for future energy storage applications.
Audience Take Away:
- The audience will get an idea about how electrodes prepared via binder-free approach can dramatically enhance the electrochemical performance of energy storage devices.
- The audience can design their future research work on the idea that will be floated.
- Of course, energy storage technology is the shaping factor of the globe and audience should have idea about how can they bring innovations in the current technology.
- Binder-free methods are not very well known and highlighting the method can provide a pathway for future advancements in the field.
