Fabrication of 1T VS2 Electrode-Based In-Plane Micro-Supercapacitor Using a Cost-Effective Mask-Assisted Printing Technique

Abstract

Vanadium disulfide (VS2) is an important member of the transition-metal dichalcogenides (TMDs) family, which offers high conductivity. In nature, it can exist in two phases, i.e., 1T and 2H. Herein, the metallic 1T VS2-based in-plane micro-supercapacitor (MSC) is fabricated by a facile-mask-assisted printing technique. Initially, the 1T VS2 nanosheets are synthesized using a simple one-pot hydrothermal route. The material characterizations have claimed the formation of a 1T phase and the density of states (DOS) reveal that the 1T phase of VS2 is metallic in nature. After experimental and theoretical investigations of synthesized nanosheets, a VS2 electrode-based in-plane MSC is fabricated using a simple mask-assisted printing technique. The fabricated device demonstrates excellent capacitance retention of 97.6% after 1000 cycles of cyclic voltammetry measurement at a 100 mV s−1 scan rate. The device also shows an excellent areal capacitance of 212.7 mF cm−2 and a high areal energy density of 10.63 μWh cm−2 at a high-power density of 4.45 mW cm−2. This low-cost and simple fabrication process can produce high-performance in-plane MSC devices.