Template Synthesis of Shape-Tailorable NiS₂ Hollow Prisms as High-Performance Supercapacitor Materials

Uniform NiS₂ hollow nanoprisms have been controllably synthesized by a facial sacrificial template method including two-step refluxed reactions. The morphology of the hollow NiS₂ prisms can be easily tailored by the low cost nickel complex template. With unique hollow structure, efficient electron, and ion transport pathway as well as single crystal structure, the NiS₂ hollow prisms electrode exhibits excellent pseudocapacitive performance in LiOH electrolyte. It can deliver a specific capacitance of 1725 F g^-1 at a current density of 5 A g^-1 and 1193 F g^-1 even at a current density of 40 A g^-1. Furthermore, the materials also present an amazing cycling stability, that is, the specific capacitance can increase from 1367 F g^-1 to 1680 F g^-1 after 10 000 cycles of charge-discharge at the current density of 20 A g^-1.