Investigating the CoS₂ Mass Fraction Enhancing Performance Supercapacitor for Medium Low Consumption

¹ Department of Physics, Faculty of Mathematics and Natural Science, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia
² Center of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia
³ School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 3000, Thailand

^* Corresponding author: markus.diantoro.fmipa@um.ac.id.

Abstract

Supercapacitor are one of the most environmentally friendly electrical energy storage devices. Improvement of supercapacitor performance continues to be carried out by combining active materials and transition metal oxides/hydroxides. In this study, a composite electrode material based on activated carbon with a mass percent variation of CoS₂ has been successfully carried out. The composition of Ni(OH)₂ - CoS₂ /Graphene Nanosheet//Carbon electrode consists of 10, 15, and 20% CoS₂ . The electrodes were then characterized using X-Ray Diffraction (XRD), Scanning Electron Microscope - Energy Dispersive X-ray (SEM-EDX). The research was continued by fabricating a symmetric coin cell. Supercapacitor device performance was characterized using Cyclic Voltammetry (CV), Charge-Discharge (CD) and Electrochemical Impedance Spectroscopy (EIS). The morphology of activated carbon shows porous chunks that are beneficial in the electrolyte ion adsorption process. While CoS₂ and Ni(OH)₂ materials indicated in bulk form. Characterization results show the most optimum sample is in the 15% CoS₂ sample with EIS characterization showing the smallest equivalent series resistance (ESR) of 0.81 Ω. CD characterization results were able to have specific capacitance, energy density and power density of 58.25 Fg-1, 1.59 Wh/kg, and 70.49 W/kg respectively and were able to survive up to 88.84% after 1000 test.