Facile electrochemical preparation of a composite film of ruthenium dioxide and carboxylated graphene for a high performance supercapacitor
Facile electrochemical preparation of a composite film of ruthenium dioxide and carboxylated graphene for a high performance supercapacitor
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用于高性能超级电容器的二氧化钌和羧化石墨烯复合膜的简便电化学制备
DOI：
10.1039/c6ra03615e
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发表时间：
2016-01-01
期刊：
影响因子：
3.9
通讯作者：
Xie, Qingji
中科院分区：
文献类型：
--
作者：
Meng, Yue;Wang, Linping;Xie, Qingji
Ruthenium and carboxylated graphene (CG) were co-electrodeposited at -0.25 V vs. SCE on a quartz crystal microbalance (QCM) Au electrode in a stirred aqueous dispersion containing 0.6 mM RuCl3, 1 mg mL(-1) CG and 0.1 M H2SO4. The Ru-CG composite was electrooxidized by cyclic voltammetry in 0.5 M aqueous H2SO4 to yield a RuO2-CG/QCM electrode for supercapacitor research. In situ QCM technique and ex situ scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) spectroscopy, and Raman spectroscopy were used for process monitoring and/or film characterizations. The RuO2-CG/QCM electrode exhibited an apparent specific capacitance of 756 F g(-1), an energy density of 101 W h kg(-1) at a power density of 2.5 kW kg(-1), and high stability. The specific capacitance is higher than those of similarly prepared RuO2/QCM, RuO2-multiwalled carbon nanotubes (MWCNTs)/QCM, RuO2-graphene oxide/QCM electrodes and a castcoated CG/QCM electrode, as well as many reported RuO2-based electrodes. The present method for the preparation of the RuO2-CG composite film only needs two simple electrochemical processes (solution-stirred composite electrodeposition and then a solution-quiescent anodic treatment), which is promising for the facile preparation of other similar nanocomposite films for wider applications.
