Design and assembly of a high stability asymmetric supercapacitor based on pseudocapacitive zinc–nickel sulfide nanosheets and fast ion-transport carbon nanosheets

A novel asymmetric supercapacitor is designed and assembled based on flower-like zinc–nickel sulfides (Zn–Ni–S) positive electrode and pitaya mesocarps-based carbon nanosheets (PMCN) negative electrode, which exhibits an excellent electrochemical performance.