Synthesis and Characterization of Hierarchical NiO/Ni-Co-Mn Oxide Nanocomposite Materials for High Performance Supercapacitors

摘要

Hierarchical NiO/Ni-Co-Mn oxide nanocomposite materials on nickel foam substrates were prepared bychemical bath deposition. The elemental mappings, microstructures and phase structures were observedby field-emission scanning electron microscope and X-ray diffraction, and the electrochemicalproperties were measured by electrochemical workstation. The grid-like NiO nanosheets grew directlyon nickel foam substrates, thereafter Ni-Co-Mn oxide nanosheets were coated on NiO nanosheets toform a layered composite structure. Cyclic voltammetry analysis shows that the obvious Faradaicreactions were found and the charge could be stored quickly. The low charge transfer resistance displaysthat the nanocomposite structure can improve the electrochemical activity. Meanwhile, the high specificcapacity (1468.14 F g-1 at a current density of 1 A g-1) and high cycle performance (90.76% retention at5 A g-1 after 3000 cycles) have been obtained by galvanostatic charge-discharge measurements.Therefore, NiO/Ni-Co-Mn oxide nanocomposite material as an ideal energy storage material may bepotential to use in high performance supercapacitors.