Preparation and characterization of RuO2 · xH2O/carbon aerogel composites for supercapacitors |
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Authors: | Jun Li Xianyou Wang Qinghua Huang Chunling Dai Sergio Gamboa P. J. Sebastian |
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Affiliation: | (1) School of Chemistry, Xiangtan University, Hunan, 411105, China;(2) Solar-Hydrogen-Fuel Cell Group, CIE-UNAM, Temixco, Morelos, 62580, Mexico |
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Abstract: | A series of RuO2 · xH2O/carbon aerogel (CA) composite electrode materials was prepared by a chemical precipitation method. Ultrasonication was used to accelerate the chemical reaction and improve the dispersion of RuO2 · xH2O particles on the surface and the pores of the aerogel. The structure and morphology of the as-prepared composite were characterized by N2 adsorption isotherm, X-ray diffraction (XRD), and field emission-scanning electron microscopy (FE-SEM). The results showed that the CA had a pearly network structure and the composites had a relatively high specific surface area and mesopore volume. The electrochemical performance of the composite electrodes was studied by cyclic voltammetry, galvanostatic charge/discharge measurements and electrochemical impedance measurements. The results indicated a substantial increase in the specific capacitance of the composite. Moreover, the utilization efficiency of RuO2 · xH2O was greatly improved by loading it on the conductive and porous CA due to a significant improvement in the inter-particle electronic conductivity and the extensive mesoporous network of the composites. |
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Keywords: | Carbon aerogel RuO2 · xH2O RuO2 · xH2O/CA composite Impregnation Electrochemical properties |
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