![]() ![]() 19 The unpaired d electron of vanadium is responsible for the high electronic conductivity. 18 1T structure of VSe 2 evinced metallic behaviour in nature. This layered structure, highly active edges and basal sites bestowed prepossessing energy storage properties to VSe 2. 17) is the octahedral vanadium atom coordination in a tetragonal symmetry with an offset arrangement of layers held together by weak van der Waal force. 12–14 Among TMDs, 1T-VSe 2 is one of the attractive electrode material having high electrical conductivity and surface area. 10,11 Properties like large surface area, polytypic structure (2H and 1T), easiness to functionalize, flexibility toward the controlled strain and variable oxidation state make them the most desirable candidates for both EDLC and pseudocapacitors based energy storage devices. 8,9 Transition metal dichalcogenides (TMDs) are rigorously expedited 2D materials for electrochemical energy storage applications. 7 In the case of pseudocapacitors, rapid faradaic reactions occur at the surface or near-surface of the electrode and there is no solid-state diffusion like batteries. 6 The occurrence of a faradaic electron transfer in the energy storage makes the device a battery-like supercapacitor. 4,5 In a conventional EDLC, charge storage occurs due to the formation of an electric double layer at the electrode–electrolyte interfaces. (1) electric double-layer capacitors (EDLCs), (2) pseudocapacitors and (3) battery like capacitors. 3 According to the energy storage mechanism, supercapacitors can be categorized into three types i.e. 2 Their high cycling life and reversibility also give them an edge over other energy storage devices. 1 Unlike batteries, supercapacitors have higher power density which helps them to accumulate and provide more energy for a shorter period compared to batteries. Batteries can store more energy than supercapacitors but the faradaic reaction to store energy in batteries hinders their use in high power operations. ![]() Batteries and supercapacitors are the most favourable devices for these purposes. The growing demands for energy resources and the limitations of fossil fuels have stimulated intense research on alternative high-performance energy storage devices. ![]()
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