Synthesis of heterostructured NiS2/NiS/rGO nanocomposite as an effective nanomaterial for supercapacitor application

As a result of the global energy crisis, energy storage plays an important role where supercapacitors play a prominent role in energy storage applications. High-performance supercapacitor electrode materials combining environmental friendliness, high energy density, and exceptional chemical and physical stability are essential for energy storage applications. As electrode morphology significantly affects electrochemical performance, we have chosen metal sulfides to meet such requirements. In this work, we have synthesized NiS₂/NiS/rGO with heterostructured morphology by combining nanorods and nanocubes. Material characterization was conducted through XRD, FTIR, and Raman spectroscopy. NiS₂/NiS/rGO exhibited a remarkable 1148 F/g at 1 A/g and 1385 F/g for 5 mV/s scan rate. Further investigation into theoretical current and charge contributions was studied using Dunn's and Trasatti's techniques. Two-electrode full-cell fabrication resulted 158 F/g at 0.5A/g, 49 Whkg^-1 energy density and 372 Wkg^-1 power densities. Stability analysis via GCD at a voltage of 1.5 V demonstrated a capacitive retention of 98.2% for the prepared material for 5000 cycles.