Octylamine Assisted Hydrothermal Growth of Silver Sulphide Nanoparticles as Efficient Electrode Material for Energy Storage Application

Abstract

This study systematically investigates the electrochemical energy storage performance of hydrothermally synthesized silver sulfide (Ag₂S) nanoparticles as an advanced electrode material for supercapacitors. Structural, morphological, and optical analyses were conducted using X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-visible spectroscopy, confirming the successful synthesis and phase purity of Ag₂S nanoparticles. The electrochemical properties were evaluated in a three-electrode system using Na₂SO₄ electrolyte through cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS). The Ag₂S electrode exhibited a remarkable specific capacitance of 562.5 F/g, a high energy density of 145.8 Wh/kg, and a power density of 84 W/kg, demonstrating strong pseudocapacitive behavior with efficient charge storage capability. Furthermore, the electrode displayed excellent cyclic stability, retaining 90% of its initial capacitance even after 5000 charge-discharge cycles. These results highlight the immense potential of Ag₂S nanoparticles as a high-performance electrode material, contributing to the advancement of next-generation energy storage devices.