Porous metal-organic frameworks derived carbon and nickel sulfides composite electrode for energy storage materials

Abstract

Researchers have extensively investigated the use of metal-organic frameworks (MOFs), which contain a greater surface area, high porosity, and controlled pore structure, in supercapacitors, sensors and biological applications. Here, we present a novel method for the sonication-improved hydrothermal reaction process of nickel sulfides decorated on metal organic framework derived carbon composite. The NiS@Ni-MOF composite has improved surface, morphological, and electrochemical properties after being annealed at an ideal temperature of 200 °C and then being subjected to a hydrothermal process. The composite electrode fabrication displays improved specific capacitances of 950 F/g at 1 A/g, long-lasting cycle stability, and exceptional capacitance retention in the presence of 6 M KOH electrolyte. Additionally, even at a high current density of 5 A g−1 and 5000 cycles, the capacitance retention can keep 99.7 % of its original value. The NiS@Ni-MOF composite's synergistic effects between its distinctive structural features are responsible for its superior electrochemical capabilities, which make it a promising electrode material for high performance supercapacitors. © 2023