High-performance supercapacitor electrode obtained by directly bonding 2D materials: hierarchal NiS2 on reduced graphene oxide.

Here, we present the synthesis of a novel porosity core-shell oriented NiS₂@C-rGO hybrid network for high-performance supercapacitors using a simple hydrothermal method. The NiS₂@C-rGO nanocomposite is a three-dimensional material made up of clusters of NiS₂ nanoparticles coated in carbon and rGO nanosheets. To achieve fast ion and electron transportation and a phenomenal specific surface area, NiS₂@C-rGO particles are uniformly distributed and intercalated between rGO nanosheets to create a 3D carbon matrix. In a 1 M H₂SO₄ electrolyte, the cyclic voltammetry and galvanostatic charge-discharge method have been used to thoroughly examine the physicochemical features and electrochemical properties. NiS₂ and NiS₂@C-rGO were reported to have capacitances of 565 Fg⁻¹ (1 Ag⁻¹) and 1297 Fg⁻¹ at 1 Ag⁻¹, respectively, with 95.3% capacitance retention after 10,000 cycles at 1 Ag⁻¹. The NiS₂@C-rGO is utilized as a positive electrode, and activated carbon (AC) is employed as a negative electrode to fabricate a supercapattery, which exhibits a wide operating potential window of 1.6 V, a high energy density of 44.1 Whkg⁻¹ at 755 Wkg⁻¹, and even 10 Whkg⁻¹ at an elevated power density of 7650 Wkg⁻¹. Hence, the fabricated ASC device confirmed that the NiS₂@C-rGO composite could be used as energy storage electrode materials for supercapacitor applications. [ABSTRACT FROM AUTHOR]