ReS₂: A High-Rate Pseudocapacitive Energy Storage Material

Transition-metal dichalcogenides have attracted exceptional attention in the field of energy storage such as lithium-ion batteries and supercapacitors because of their unique electronic, optical, and mechanical properties. In this work, we synthesized rhenium disulfide (ReS₂) on high-throughput, electronics industry-standard, screen-printed electrodes (SPEs) to use as an electrode material for supercapacitor application. The ReS₂ nanoparticles were grown by a room-temperature, aqueous-solution-based electrochemical deposition method, which is capable of parallel modification of SPEs. The topographic detail and electrochemical activity of the sample surface were characterized by a spatial electroanalytical mapping technique known as scanning electrochemical microscopy. The charge storage kinetics are appraised with deep insight following diffusion-controlled and capacitive-like mechanisms. The ReS₂-coated SPE displayed a promising specific capacitance of 156 mF cm–2 at a current density of 1.6 mA cm–2, which shows that ReS₂ can be used as a potential pseudocapacitive material in supercapacitors.