Growth of phosphorus-substituted Ni-Co-S and iron oxide nanosheets on N-doped carbon nanofibers for high performance hybrid supercapacitor

Herein, the phosphorus-substituted nickel cobalt sulfides nanosheet arrays growth on nitrogen doped carbonic nanofibers (donated as Ni-Co-S-P) are prepared by an electrodeposition method. The morphologies and chemical composition of Ni-Co-S-P are investigated by SEM, TEM, XPS and EDS. The electrochemical properties of Ni-Co-S-P are tested by CV, GCD and EIS technologies. And the sample Ni-Co-S-P-4 displays the most outstanding electrochemical properties including electrocatalytic activity, rate capability and specific capacitance. In addition, the iron oxide nanosheets growth on N-CNFs (Fe-O/N-CNFs) are prepared by the same electrodepositing route. And they can serve as a negative electrode according to the electrochemical performances analysis. A hybrid supercapacitor based on the obtained electrodes is further assembled by using Fe-O/N-CNFs as negative electrode and Ni-Co-S-P as positive electrode. The as-fabricated hybrid supercapacitor show outstanding energy storage performance, it possesses a high energy density at 55.8 Wh.kg(-1) corresponding to a power density at 402.9 W kg(-1). (c) 2020 Elsevier B.V. All rights reserved.