Description:
High-performance supercapacitors have attracted considerable interests, due to their h igh-power density, fast charge/discharge process and long cycle life. However, supercapacitors also have unavoidable drawbacks, such as low energy density, which limit their applications. Herein, the hierarchical core-shell structured NiCoPNiS nanoarrays have been successfully synthesized by using the vertically grown NiCoP nanowire as the core and the NiS prepared by electrodeposition as the shell. As the “super channel” for electron transfer, NiCoP is coupled with the NiS shell to allow ions diffusion rapid and improve cycle stability at the same time. Consequently, the optimized NiCoP@NiS nanoarrays electrode displays an extremely good specific capacity (2128 F g -1 at 1 A g -1 ) and a superior long cycle life (the capacity retention of 90.36% after 10000 cycles). A hybrid supercapacitor (HSC) using the NiCoP@NiS and activated carbon (AC) has been assembled, which displays an excellent energy density of 30.47 Wh kg -1 , a remarkable power energy of 800 W kg-1. Our study shows that the prepared NiCoP@NiS hierarchical core-shell structured nanoarrays have great prospects as a new type of battery-type electrode for high-performance supercapacitors