Abstract
Nickel oxide/copper oxide composites are prepared. Then the composites were transferred into autoclave and thermal sinter under different temperature and different time. As-prepared composites were analyzed by XRD, and it was concluded that with the increase of hydrothermal time, content of NiO and Ni0.75Cu0.25O increases, but particles become smaller; it would improve the electrochemical activity. By SEM images directed lower crystallinity of composites, deeper porosity and rougher surface would have better electrochemical activity. The electrochemical performance was investigated by cyclic voltametry, AC impedance and galvanostatic charge-discharge. All results show that under the condition of 150°C 30 h, the electrochemical performance is the best. The specific capacitance was 225.67 F·g-1 at the charge-discharge current of 1 A·g-1.
Highlights
Supercapacitor has higher power density compared with better battery, and has higher specific capacity and energy density compared with better conventional capacitor [1] [2], and mainly used in aerospace, computers, electric toys and other fields [3] [4]
The composites were transferred into autoclave and thermal sinter under different temperature and different time
As-prepared composites were analyzed by XRD, and it was concluded that with the increase of hydrothermal time, content of NiO and Ni0.75Cu0.25O increases, but particles become smaller; it would improve the electrochemical activity
Summary
Supercapacitor has higher power density compared with better battery, and has higher specific capacity and energy density compared with better conventional capacitor [1] [2], and mainly used in aerospace, computers, electric toys and other fields [3] [4]. Metal oxides and their composites, conductive polymers and other materials were used in ultracapacitors [5] [6] [7] [8]. Meng prepared graphite oxide by Hummers, synthesis grapheme-zinc oxide by solvothermal method; the specific capacity was only 9 F·g−1 at a current density of 1·g−1 [9]. Science researcher must seek low cost metal oxides. MnO2, NiO and CuO Metal oxide composites were used in making ultracapacitors [7]-[12]. In 6 mol/L KOH electrolyte, the specific capacitance was 225.67 F∙g−1 at the charge-discharge current of 1 A∙g−1 and induced charge transfer resistance (Rct) and diffusion impedance (Warburg impedance) [10] [11] were relatively low
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