Synthesis of MnO₂/short multi-walled carbon nanotube nanocomposite for supercapacitors

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• 作者：Jinhui Zhang ; Yanhui Wang ; Jianbing Zang ; Guoxiang Xin ; Huiying Ji ; Yungang Yuan
• 关键词：Composite materials ; Nanostructures ; Oxides ; Coating
• 刊名：Materials Chemistry and Physics
• 出版年：15 January, 2014
• 年：2014
• 卷：143
• 期：2
• 页码：595-599
• 全文大小：1299 K

文摘

Multi-walled carbon nanotubes (MWNTs) were selectively etched in molten nitrate to produce short MWNTs (s-MWNTs). MnO₂/s-MWNT nanocomposite was synthesized by a reduction of potassium permanganate under microwave irradiation. For comparative purpose, MnO₂/MWNT nanocomposite was also synthesized and investigated for its physical and electrochemical performance. Uniform and conformal MnO₂ coatings were more easily formed on the surfaces of individual s-MWNTs. MnO₂/s-MWNT nanocomposite estimated by cyclic voltammetry (CV) in 0.5聽M Na₂SO₄ aqueous solution had the specific capacitance as high as 392.1聽F聽g^鈭? at 2聽mV聽s^鈭?. This value was more than 48.9% larger than MnO₂/s-MWNT nanocomposite. In addition, MnO₂/s-MWNT nanocomposite was also examined by repeating the CV test at a scan rate of 50聽mV聽s^鈭?, exhibiting an excellent cycling stability along with 99.2% specific capacitance retained after 1000 cycles. Therefore, MnO₂/s-MWNT nanocomposite is a promising electrode material in the supercapacitors.