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首页> 外文期刊>RSC Advances >Multiwalled carbon nanotubes coated with a thin carbon layer for use as composite electrodes in supercapacitors
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Multiwalled carbon nanotubes coated with a thin carbon layer for use as composite electrodes in supercapacitors

机译：涂有薄碳层的多壁碳纳米管，用作超级电容器中的复合电极

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Submicron-thick films of composite (CSN) electrodes were prepared by the simple spin-coating of a multiwalled carbon nanotube (MWCNT) suspension with sucrose as the precursor to form a thin carbon layer; this was followed by heat treatment at 1000 degrees C for 2 h. Thin carbon layers were coated onto the outer surface of the MWCNTs and the resulting CSN electrode was shown to be an interconnected open network structure. This binder-free thin-film CSN electrode with a unique architecture has a large areal capacitance of similar to 723 mu F cm(-2) at a constant current of 0.23 mu A cm(-2) in a Na2SO4 aqueous electrolyte. About 81% of the initial capacitance is preserved, even at high specific currents. Based on the results of electrochemical impedance spectroscopy, the CSN electrode was shown to concurrently optimize ion and electron transport for high power delivery. It also shows good cycle stability after prolonged operation (up to 3000 charge/discharge cycles).
机译：复合材料（CSN）电极的亚微米厚膜是通过简单旋涂以蔗糖为前体的多壁碳纳米管（MWCNT）悬浮液以形成薄碳层来制备的;然后在1000摄氏度下热处理2小时。薄碳层涂覆在MWCNT的外表面上，所得CSN电极显示为互连的开放网络结构。这种无粘合剂的薄膜CSN电极具有独特的结构，在Na2SO4水性电解质中，在0.23μAcm（-2）的恒定电流下，具有类似于723μFcm（-2）的大面积电容。即使在高比电流下，仍可保留约81％的初始电容。根据电化学阻抗谱的结果，CSN电极可同时优化离子和电子传输，从而实现高功率传输。长时间运行（最多3000个充电/放电循环）后，它还显示出良好的循环稳定性。

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