Tailoring the Interface of Transition Metal Dichalcogenide Electrode for Hybrid Supercapacitors

Abstract

Transition metal dichalcogenides (TMDCs) have been explored in recent years to utilize in electronics due to their remarkable properties. Here, the enhanced energy storage performance of tungsten disulfide (WS2) by introducing the conductive interfacial layers of Ag and Cu between substrate and active material (WS2) deposited via magnetron sputtering to prepare WS2, Ag-WS2 and Cu-WS2 is reported. Hybrid supercapacitor (Ag-WS2//AC ) was fabricated since Ag-WS2 was observed to be the proficient of all three samples. The Ag-WS2//AC device have attained the specific capacity (Qs) of 224 C/g, while delivering the maximum specific energy (Es) and specific power (Ps) of 50 W h/kg and 4003 W/kg, respectively. The device was reconnoitered to be stable enough as it retains the 89% capacity and 97% columbic efficiency after 1000 cycles. Additionally, the capacitive and diffusive currents were obtained through Dunn’s model to observe the underlying charging phenomenon at each scan rate.

Keywords: Dichalcogenides, hybrid supercapacitors, energy density, power density, interfacial layer