Capacitive behavior of graphene–ZnO composite film for supercapacitors

来自 dx.doi.org

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209

作者：

Y Zhang，H Li，L Pan，T Lu，S Zhuo

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摘要：

Graphene–ZnO composite film was synthesized for its potential application in supercapacitors. Graphene was prepared by a modified Hummers method and hydrazine reduction process, and ZnO was deposited on graphene by ultrasonic spray pyrolysis. The electrochemical characteristics of the film were investigated through electrochemical impedance spectrometry, cyclic voltammetry and chronopotentiometry tests. The results showed that graphene–ZnO composite film exhibited an enhanced capacitive behavior with better reversible charging/discharging ability and higher capacitance values, by comparison to pure graphene or ZnO electrode.

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关键词：

Experimental/ composite materials electrochemical impedance spectroscopy graphene II-VI semiconductors pyrolysis reduction (chemical) supercapacitors thin films voltammetry (chemical analysis) wide band gap semiconductors/ capacitive behavior composite film supercapacitors Hummers method hydrazine reduction process ultrasonic spray pyrolysis electrochemical impedance spectrometry cyclic voltammetry chronopotentiometry tests reversible charging ability reversible discharging ability C-ZnO/ A6855 Thin film growth, structure, and epitaxy A7360L Electrical properties of II-VI and III-V semiconductors (thin films/low-dimensional structures) A7360T Electrical properties of fullerenes and related materials (thin films/low-dimensional structures) A8230 Specific chemical reactions reaction mechanisms A8230L Decomposition reactions (pyrolysis, dissociation, and group ejection) A8245 Electrochemistry and electrophoresis A8280F Electrochemical analytical methods B2520D II-VI and III-V semiconductors/