Microwave Construction of NiSb/NiTe Composites on\nNi-Foam for High-Performance Supercapacitors

Abstract

In this paper, NiSb/NiTe/Ni\ncomposites were smoothly developed\nvia the microwave method for supercapacitors. The synthesis of NiSb/NiTe\ncrystals was revealed by X-ray photoelectron spectroscopy and X-ray\ndiffraction. The analytic results of scanning electron microscopy\nand energy dispersive spectroscopy uncover the microscopic morphology\nas well as the constituent elements of the composites. Self-supported\nNiSb/NiTe is a supercapacitor cathode that combines high capacitance\nwith excellent cycling stability. The obtained composite electrode\ndisplayed remarkable electrochemical properties, presenting a special\ncapacitance of 1870 F g^–1 (1 A g^–1) and 81.5% of the original capacity through 30,000 times (10 A g^–1) of the charging/discharging process. Further, an\nasymmetric supercapacitor was prepared employing NiSb/NiTe as a cathode\nand activated carbon as an anode. NiSb/NiTe//AC exhibited a high energy\ndensity of 224.6 uW h cm^–2 with a power density\nof 750 μW cm^–2 and provided a favorable cycling\nstability of 83% after 10,000 cycles.