Fabrication of NiO@Co3O4 core/shell nanofibres for high-performance supercapacitors

NiO@Co3O4 core/shell nanofibres (NiO@Co3O4 NFs) as a promising supercapacitors electrode material were synthesized by a facile co-electrospinning method and heat treatment. The Ni0 core is about 125 nm in diameter and the Co3O4 shell has a thickness of similar to 80 nm, The electrochemical properties of NiO@Co3O4 NFs in 6 M KOH aqueous electrolyte are investigated. Compared with NiO (222 F g(-1), 1 A g(-1)) and Co3O4 (284 F g(-1) 1 A g(-1)) nanofibres, NiO@Co3O4 NFs electrode exhibits higher specific capacitance (437 F g(-1), 1 A g(-1)), as well as good cycling stability (82.9% retention after 1000 cycles at 5 A g(-1)). The enhanced electrochemical performances can be attributed to the uniform core/shell fibre nanostructures. These results suggest that such NiO@Co3O4 NFs would be promising electrodes for supercapacitors.