Synthesis Of Cobalt-based Composites For Their Electrochemical Property

Recently,with the increase of environmental pollution and energy crisis,one of the effective ways to solve environmental and energy problems is to vigorously develop renewable energy and energy materials.So far,new energy storage device such as supercapacitors,have drawn much attention due to its high power density,long lifespan and environmental conservation.This paper is about controllable synthesis of a series of cobalt-based composites on Ni foam through hydrothermal method and potentiostatically electrochemical deposition.All the fabricated materials can be used directly as the working electrode to assemeble supercapacitors.The main content is as follows:1.The ZnCo₂O₄@NiMoO4 core/shell nanostructure was successfully synthesized on Ni foam to assemble symmetric supercapacitor for energy storage.When the ZnCo₂O₄@NiMoO4 electrode was used as working electrode for electrochemical measurements,its specific capacitance is 1399.8 F·g-1 at the current density of 1 A·g-1.And the assembled symmetric supercapacitor delivers an energy density of 186.1 W h kg-1 at the power density of 500 W kg-1.It can be seen that ZnCo₂O₄@NiMoO4 is provided with excellent electrochemical performance.2.A layer of ZnMoO4 was successfully deposited on the top of ZnCo₂O₄ nanowire arrays through hydrothermal method and then it was tested for electrochemical properties.The electrochemical results show that the electrode delivered a specific capacitance of 1506 F·g-1 at the current density of 1 A·g-1.Meanwhile,we can see that it also has a high energy density via calculation.For example,it delivers a good energy density of 52.29 W h kg-1 at the power density of 500 W kg-1,showing good application prospects.3.Ppy was potentiostatically and uniformly electrodeposited on the surface of MnCo₂O₄ nanowires so that they connect each other into net structure.`The electrochemical results show that after being coated by Ppy,the specific capacitance increased by 150 percent,what’s more,the MnCo₂O₄@Ppy electrode shows good stability.