Abstract
The inexpensive assembly of high-performance supercapacitors has always been a research hotspot in energy storage. Herein, we used simple procedures and inexpensive raw materials to assemble a high-performance supercapacitor with p-doped porous carbon (p-PC) as the negative electrode and heteroatomic polymer carbon modified NiCo2O4 (NiCo2O4@PZSC) as the positive electrode. The p-PC with excellent electrochemical properties (197.5 F g−1, 99 % after 10,000r) was prepared by chemical modification using cheap petroleum coke as raw material. The NiCo2O4@PZSC was obtained by in-situ coating polyphosphazene on NiCo2O4 nanowires and calcination in air, exhibiting an admirable specific capacitance of 841 F g−1 with suitable cyclic stability (81 %, 8000r). The assembled hybrid supercapacitor NiCo2O4@PZSC (+)//p-PC (−) embodies high energy, power density and cyclic stability (30.5 Wh kg−1, 800 W kg−1, 90 %, 10,000r). This work opens up a new path to rationally design heteroatom-doped carbon modified binary transition metals for efficient supercapacitors.
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