ABSTRACT
Over the past few decades, the application of new novel materials in energy storage system has seen excellent development. We report a novel MnCo2O4/NiO nanostructure prepared by a simplistic chemical bath deposition method and employed it as a binder free electrode in the supercapacitor. The synergistic attraction from a high density of active sites, better transportation of ion diffusion and super-most electrical transportation, which deliver boost electrochemical activities. X-ray diffraction, field-emission scanning electron microscopy, and X-ray photoelectron spectroscopy have been used to investigate the crystallinity, morphology, and elemental composition of the as-synthesized precursors, respectively. Cyclic voltammetry, galvanostatic charge/discharge, and electron impedance spectroscopy have been employed to investigate the electrochemical properties. The unique nanoparticle structures delivered additional well-organized pathways for the swift mobility of electrons and ions. The as-prepared binder-free MnCo2O4/NiO nanocomposite electrode has a high specific capacity of 453.3 C g-1 at 1 Ag-1, and an excellent cycling reliability of 91.89 percent even after 4000 cycles, which are significantly higher than bare MnCo2O4 and NiO electrodes. Finally, these results disclose that the as-fabricated MnCo2O4/NiO electrode could be a favored-like electrode material holds substantial potential and supreme option for efficient supercapacitor and their energy storage-related applications.
ABSTRACT
[This corrects the article DOI: 10.1039/C8RA09081E.].
ABSTRACT
Well-ordered, unique interconnected nanostructured binary metal oxides with lightweight, free-standing, and highly flexible nickel foam substrate electrodes have attracted tremendous research attention for high performance supercapacitor applications owing to the combination of the improved electrical conductivity and highly efficient electron and ion transport channels. In this study, a unique interconnected nanoplate-like nickel cobaltite (NiCo2O4) nanostructure was synthesized on highly conductive nickel foam and its use as a binder-free material in energy storage applications was assessed. The nanoplate-like NiCo2O4 nanostructure electrode was prepared by a simple chemical bath deposition method under optimized conditions. The NiCo2O4 electrode delivered an outstanding specific capacitance of 2791 F g-1 at a current density of 5 A g-1 in a KOH electrolyte in a three-electrode system as well as outstanding cycling stability with 99.1% retention after 3000 cycles at a current density of 7 A g-1. The as-synthesized NiCo2O4 electrode had a maximum energy density of 63.8 W h kg-1 and exhibited an outstanding high power density of approximately 654 W h kg-1. This paper reports a simple and cost-effective process for the synthesis of flexible high performance devices that may inspire new ideas for energy storage applications.
ABSTRACT
A novel multi-component and binder-free electrode material of NiCo2O4 (NCO) nanoplates adhered to NiMoO4 (NMO) honeycomb composites was prepared on a nickel foam (NF) using a simple chemical bath deposition strategy. This paper reports the synthesis of a honeycomb composite with folded silk-like NF@NMO@NCO nanostructures on nickel foam and its use to increase the availability of electrochemically active sites to provide additional pathways for electron transport and improve the utilization rate of the electrode materials. As a result, the as-fabricated NF@NMO@NCO electrode exhibited a maximum specific capacitance of 2695 F g-1 at a current density of 20 mA g-2, which is much better than that of NF@NCO nanoplates (1018 F g-1) and NF@NMO honeycomb (1194 F g-1). Moreover, the as-synthesized NF@NMO@NCO achieved a high energy density of 61.2 W h kg-1 and outstanding power density of 371.5 W kg-1 as well as exceptional capacitance retention of 98.9% after 3000 cycles. The outstanding electrochemical performance makes the honeycomb composite with a folded silk-like nanostructure a promising candidate for advanced electrochemical energy storage.
