Ruthenium Oxide/Activated Carbon Composites for Electrochemical Capacitors

Abstract:

Activated carbon (AC) was prepared from lignite by microwave heating ZnCl2. The pore structure parameters of AC are characterized by nitrogen adsorption technique. The AC and ruthenium oxide/AC composite are characterized by thermogravimetric analysis and transmission electron microscope. Electrochemical properties of ACs and ruthenium oxide/AC composite electrodes were investigated by cyclic voltammetry and constant current charge–discharge after AC was pre−oxidized by HNO3 solution. The results show that the specific surface area and total pore volume of AC from lignite reaches 1310 m2 g−1 and 0.80 cm3 g−1, respectively. The micropore volume of AC from lignite totals only 12.5%. AC and ruthenium oxide/AC composite electrodes with 5wt.% ruthenium oxide loading show high cycle stability. Compared to pristine AC electrode, specific capacitance of ruthenium/AC composite electrode and energy density of ruthenium/AC capacitor after 100 charge−discharge cycles increases 40.8% and 39.1%, respectively.

• Periodical: Advanced Materials Research (Volumes 347-353)
• Pages: 3370-3374
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.347-353.3370
• Online since: October 2011
• Authors: Ming Dong Zheng, Ru Chun Li, Xiao Jun He, Xian Ping Dong, Ping Hua Ling, Nan Zhao, Xiao Yong Zhang, Mo Xin Yu, Ming Bo Wu
• Keywords: Activated Carbon (AC), Electrochemical Capacitor, Microwave Heating

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