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In this paper, disulfides WS 2  and MoS 2  were successfully prepared using thermal decomposition and utilised for fabrication of supercapacitor- and water splitting electrodes. Both, energy storage and conversion performances of these electrodes were compared with electrodes prepared with commercial MoS 2 , WS 2 , and activated carbon (AC). The electrochemical characterisation confirmed the pseudocapacitive character of disulfide-based supercapacitor electrodes. A strong influence of the scan rate on the specific capacitance was found, which is due to the diffusion of ions and the pseudocapacitive nature of charge storage. A specific capacitance of 405 mF/cm 2  at 10 mV/s scan rate was achieved on MoS 2  structures prepared by thermal decomposition. This value is 3.5-times greater than the capacitance achieved on commercial MoS 2  and 6.8-times greater than capacitance achieved on structures with activated carbon. A specific capacitance of 396 mF/cm 2  at 10 mV/s scan rate was achieved on WS 2  structures prepared by thermal decomposition, which was 2.2 and 6.7-times greater than the capacitance achieved on commercial WS 2  and AC based electrodes, respectively. Water-decomposition structures showed greater catalytic activity of thermally decomposed disulfides for HER compared to commercial materials and AC. The study showed a high perspective of MoS 2  and WS 2  prepared by thermal decomposition for energy storage applications by means of supercapacitors and energy conversion trough water electrolysis and hydrogen generation.

Supercapacitors and energy conversion structures based on WS2 and MoS2 disulfides

Supercapacitors and energy conversion structures based on WS₂ and MoS₂ disulfides