NiO Supercapacitor Electrode Preparation And Properties Of Composite Materials Research

As society progresses, it is an important problem for the humanbeing to find out a new and efficient type of renewable energy. Supercapacitor, it is also called electrochemical capacitor. Due to its high energy density, green clean, cycling property, Supercapacitor became the hotspot in the field of electrochemical energy storage in recent years. The electrode materials are the most important component of super capacitor. The performances of electrode materials have great influences in super capacitor.In the paper, nickel oxide super capacitor materials were prepared by chemical precipitation. Structure and morphology of the materials were characterized by X-ray diffraction(XRD) and scanning electron microscope(SEM). Electrochemical properties of the materials were tested on by three electrode system.Electrochemical workstation.included cyclic voltammograms(CV), constant current charge-discharge test, ac impedance test, cyclic properties of electrode materials, etc.Nickel hydroxide precursor was prepared by chemical precipitation. Structure morphology and Electrochemical workstationof nickel oxide electrode materials prepared at different calcination temperature were tested. When the calcination temperature is 350℃, structural integrity of nickel oxide materials have complete crystal shape, almost no reunion phenomenon and larger specific surface. Electrochemical testing results show thatwhen the current density is 0.1 A·g-1, the specific capacity ofnickel oxideelectrode preparedat 350℃ is 379.48 F·g-1. When the current density is 3 A·g-1 the specific capacity is 227.39 F·g-1. When the current density is 0.5 A·g-1 after 500 times the specific capacity decreased 34.44%.Electrode materials with different proportion of Ni-Co was prepared by chemical precipitation. Results show that Ni-Co composite materials present a petal shape morphology, crystallinity decreases, uniform particles small and surface area increased. The performance ofelectrode materials doped with Co elements has improved a lot. When the current density is 0.1 A·g-1, the specific capacity of Ni-Co of composite electrode materials ratio of 7:3is 1452.38 F·g-1. The specific capacity of above materials is three times higher than that of pure nickel oxide electrode materials. When the current density is 3 A·g-1, specific capacity of the material is 661.58 F·g-1. After a cycle 300 times, electrode specific capacity become steady.After 500 times, the specific capacity of the material keep 65%.Electrode materials with different proportion of Ni-Cu was prepared by chemical precipitation. The particle size distribution of the composite material become more uniform and small with increasing the content of Cu element. When the current density is 0.1 A·g-1, the specific capacity of Ni-Cu composite electrode materials ratio of 7:3 is 655.76 F·g-1. The specific capacity of above materials is one times higher than that of pure nickel oxide electrode materials. When the current density is 3 A·g-1, specific capacity of the material is 264.58 F·g-1. After 500 times, electrode specific capacity become steady and the specific capacity keep 89.85%.