Synthesis and Characterization of 3D MnNi2O4@MnNi2S4/NF-MOF-67-rGO nanoflower@nanosheet for ultra-high capacity electrode material

Abstract

This study reports a novel 3D MnNi₂O₄@MnNi₂S₄/NF-MOF-67-rGO core-shell nanoflower@nanosheet synthesized at very high temperature and pressure shows an outstanding electrode substance for ultra-high super capacitor. The structure of MnNi₂O₄@MnNi₂S₄ was determined by using infrad red spectrum, scanning electron microscopic images and cyclic voltammetric techniques. The core (MnNi₂O₄) and shell (MnNi₂S₄) are both dynamic resources and they are involved in the Faraday redox processes to make possible the MnNi₂O₄@MnNi₂S₄ conducting device to acquire more electrochemical properties. The power capacitance of the MnNi₂O₄@MnNi₂S₄ electrode material reaches 805.09 C g⁻¹ while the density of the current is 1.0 A g⁻¹. Furthermore, the preservation rate of specific capacity of the MnNi₂O₄@MnNi₂S₄ electrode reaches 91.50% after the five thousand charge - discharge cycles while the density of current is 20.0 A g⁻¹. The energy density for the MnNi₂O₄@MnNi₂S₄//AC material attains 74.64 Wh kg⁻¹ at a energy density of 774.05 Wh kg⁻¹. In addition, the MnNi₂O₄@MnNi₂S₄ //AC shows exceptional self-discharge properties. Therefore, the MnNi₂O₄@MnNi₂S₄ conducting device presents wide-ranging utilities and applications for capacitors of the battery-type. In this work, a novel 3D MnNi₂O₄@MnNi₂S₄ /NF-MOF-67-rGO core-shell nano arrangement was effectively grown-up on the Nickel foam via the reaction mixture growth technique, which misplaced the conductive additive and addition of binder and the complex method of electrode fabrication. It is quite remarkable that the maximum energy storage capacity of the 3D MnNi₂O₄@MnNi₂S₄/NF-MOF-67-rGO reaches 3579.60 F g⁻¹ at the current density of 1.0 A g⁻¹ and 1008.50 F g⁻¹ at the current density of 20.0 A g⁻¹. At a given density of current of 15.0 A g⁻¹, the retention rate of maximum energy storage capacity reaches 94.10 % after 5 cycles, showing excellent cycling performances.