Exploring the Potential of 1T-TiS₂ Electrode Materials for Supercapacitors

The distinctive characteristics of two-dimensional materials have attracted considerable interest for their prospective applications, especially in the field of energy storage. The relatively well studied transition metal dichalcogenides (TMDs), such as molybdenum disulfide (MoS₂) and tungsten disulfide (WS₂), have been shown to have electronic, chemical, and optical properties that can be tailored through fabrication methods. Relatively less studied and the lightest member of the TMD family, titanium disulfide (TiS₂) is a promising material for supercapacitor electrodes. In this work, electrically conductive bare 1T-TiS₂nanosheets were fabricated and utilized as electrodes for supercapacitors. For this purpose, self-standing and flexible TiS₂ films were fabricated through vacuum filtration. Bare TiS₂ films showed poor cyclic stability in aqueous electrolytes. Therefore, a simple dopamine treatment was developed to enhance the enhance oxidation stability of the TiS₂ films. The resulting 1T-TiS₂filmbased symmetric supercapacitor devices showed a specific capacitance and capacity retention of 10 F/g (at a scan rate of 100 mV/s) and 90% after 5000 cycles in 2M Li₂SO₄/0.1 M thiourea electrolyte, respectively.