Mofs Derived (Ni0.75co0.25)Se-2 Nanoparticles Embedded In N-Doped Nanocarbon For Hybrid Supercapacitors

Bimetallic selenides have aroused great interest as the electmactive materials for energy storage because of their high conductivity, robust electrochemical activity, and the synergistic effect. Herein, (Ni0.25Co0.25)Se-2 nanoparticles embedded in N-doped nanocarbon ((Ni0.25Co0.25)Se-2@NC) hybrids were derived from nickel and cobalt bimetal-organic frameworks (NiCo-MOFs), which were synthesized by ethylene glycol solvothermal method. Due to the synergistic contributions and unique architecture, (Ni0.25Co0.25)Se-2@NC hybrids electrode presents a considerable specific capacity of 536.6 C g(-1) at a discharge current density of 1 A g(-1). In addition, an asassembled Ni0.75C0.25/Se-2@NC//activated carbon (AC) hybrid supercapacitor (HSC) ((Ni0.25Co0.25)Se-2@NC//AC HSC) shows large specific capacitance (73.6 F g(-1 )at 0.5 A gD(-1)), outstanding energy density (26.2 Wh kg(-1) at 400 W kg(-1)) with superior cyclic performance (88.7% of capacity retention after 5000 cycles). Furthermore, a (Ni0.25Co0.25)Se-2@NC//AC device could drive a mini-fan running for 67 s. Thus, (Ni0.25Co0.25) Se-2@NC is an outstanding active material for electrochemical energy storage.