Synthesis of multinary composite (NiMnCuCoS) electrodes: Aqueous hybrid supercapacitors

Supercapacitors can upgrade their energy storage performance through a smart design of the electrode material. The long cyclic life achieved by a synergistic effect of multinary compositions, multinary electroactive composites, has fascinated the interest of researchers in the energy dilemma. This study endeavors the facile solvothermal synthesis of multinary Ni-rich NiMnCuCoS composites at different solvothermal reaction times for end use as a cathode material in aqueous hybrid supercapacitors (HSCs). Among a series of NiMnCuCoS composites, the NiMnCuCoS-4 electrode exhibits a significantly high specific capacity and areal capacitance of 201.64 mAh g-1 and 4.355 F cm-2 at 7 mA cm-2, respectively, and an excellent cycling life (76% capacitance preserved after 10,000 cycles). Furthermore, the as-fabricated aqueous NiMnCuCoS@NF// AC@NF HSC device demonstrates superior energy and power densities of 19.67 Wh kg-1 and 2951.50 W kg-1, respectively, with impressive stability (80% capacitance retention over 10,000 charge-discharge cycles). Therefore, encouraging energy storage performance with innovative pathways allows new possibilities for synthesizing multinary composites as promising candidates for next-generation HSCs.

Automated summary

By designing the electrode material intelligently, supercapacitors can enhance their energy storage performance. Multinary composites with long cyclic life and high capacitance retention have shown promising potential for next-generation hybrid supercapacitors. Furthermore, aqueous NiMnCuCoS@NF// AC@NF HSC devices demonstrate superior energy and power densities with impressive stability.