HydrothermalFabrication and Electrochemical Propertyof a 0D/2D Hybrid Nanostructure with Graphitic Carbon Nitride-IncorporatedNickel Molybdenum Sulfide

As a kind of energy storage device, supercapacitors have attracted substantial attention on account of their large capacity, cycling stability, and high energy density. Here, a 0D/2D structured composite with graphitic carbon nitride (g-C₃N₄) nanosheet (2D)-incorporated nickel molybdenum sulfide [Ni₂MoS₄(NMS)] nanoparticles(0D) (NMS/g-C₃N₄) was synthesized through a two-step hydrothermal method using NiSO₄·6H₂O and Na₂MoO₄·2H₂O as raw materials and thiourea as the sulfurizing agent. The incorporation of g-C₃N₄ nanosheets enhanced the dispersibility of NMS nanoparticles for preventing volumetric expansion during the charge–discharge cycles. The dispersed NMS nanoparticles and g-C₃N₄ nanosheets formed a 0D/2D hybrid nanostructure and could offer more active sites. The electrochemical results manifested that the formulated composite obtained a specific capacitance of 1800.6 F·g^–1 at a current density of 1 A·g^–1, and the specific capacitance of the NMS/g-C₃N₄ composite could retain 50.1% after 1000 cycles at a current density of 10 A·g^–1, representing 12.5% improvement in capacitance retention compared to the pristine NMS composite. It indicates that the NMS/g-C₃N₄ composite holds promising potential as a supercapacitor electrode material.