Effect of Different Ni/S Concentration on the Supercapacitor Properties of Activated Carbon/NiS Electrode Memoria Rosi, Irfan Afandi Syamsudin, Indra Wahyudhin Fathona, and Abrar Ismardi
Department of Engineering Physics, School of Electrical Engineering, Telkom University
This study reports on the manufacture of supercapacitor electrodes based on a composite of the activated carbon/NiS. Activated carbon is often used as an active material for ionic storage due to its nanoporous structure and high surface area. However, the activated carbon has a low specific capacitance which is limited by the Electric Double Layer Capacitor/EDLC principle. Here, we introduce the NiS as a faradic redox agent to improve the specific capacitance of the activated carbon supercapacitor through the pseudo capacitor mechanism. The Ni/S concentration varied from 10:1, 1:1, and 1:10. To make the composite activated carbon/NiS, the activated carbon was firstly prepared on the nickel foam as a current electrode, and then the NiS was electrodeposited using the produced activated carbon electrode as the working electrode, platinum as counter electrode and Ag/AgCl as a reference electrode. The electrodeposition voltage was applied from -1.2V to 0.2 V with a scan rate of 5mV/s. The activated carbon/NiS electrodes were evaluated using Scanning Electron Microscopy/Energy Dispersive X-ray Spectroscopy (SEM/EDX), cyclic voltammetry (CV), Galvanostat Charge-Discharge (GCD), and Electrochemical Impedance Spectroscopy (EIS).
