Hydrothermal synthesis and electrochemical capacitance of RuO₂·xH₂O loaded on benzenesulfonic functionalized MWCNTs

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• 作者：Bo Gao ; Liang Hao ; Qinbing Fu ; Linghao Su ; Changzhou Yuan ; Xiaogang Zhang
• 关键词：Electrochemical capacitors ; RuO₂· ; xH₂O ; Heavy loading ; Benzenesulfonic MWCNTs ; Core– ; shell structure
• 刊名：Electrochimica Acta
• 出版年：2010
• 出版时间：15 April 2010
• 年：2010
• 卷：55
• 期：11
• 页码：3681-3686
• 全文大小：1239 K

文摘

Amorphous RuO₂·xH₂O was well coated on the benzenesulfonic functionalized multi-wall carbon nanotubes (f-MWCNTs) successfully via hydrothermal method. The decorated benzenesulfonic groups served as a bifunctional role both for solubilizing and dispersing MWCNTs into aqueous solution and for tethering Ru³⁺ precursor to facilitate the following uniform chemical deposition of RuO₂·xH₂O. The electrochemical performance of RuO₂/f-MWCNTs and utilization of RuO₂·xH₂O were evidenced by cyclic voltammetry and galvanostatic charge/discharge tests. The specific capacitance of 1143 Fg⁻¹ for RuO₂·xH₂O was obtained from RuO₂/f-MWCNTs with 32 wt. % RuO₂·xH₂O, which was much higher than that of just 798 Fg⁻¹ for the RuO₂/p-MWCNTs. Even though the RuO₂·xH₂O loading increases to 45 wt. % , the utilization of RuO₂·xH₂O still possesses as high as 844.4 Fg⁻¹, indicating a good energy capacity in the case of high loading.