Three-dimensional nano MnO₂/CB composite and its application for electrochemical capacitor

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• 作者：Fan Jia^a ; Mingming Chen^a ; ^{chmmxu@gmail.com} ; Chengyang Wang^a ; Jin Wang^a ; ^b ; Jiaming Zheng^a
• 关键词：Manganese dioxide ; Carbon materials ; Nanocomposites ; Electrical properties
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：1 July, 2012
• 卷：78
• 期：Complete
• 页码：127-130
• 文件大小：801 K

摘要

A three-dimensional nanostructure composed of birnessite MnO₂ and carbon black (CB) was built via a quite simple co-precipitation method at room temperature. The natural porous construction of conductive CB granules provided enough sites for MnO₂ deposition. The as-prepared composite showed that dispersive MnO₂ nanowires were directly crystallized on the surface of CB matrix, which was believed to be beneficial to its electrochemical performance. The further investigation of cyclic voltammetry (CV) in 1 M Na₂SO₄ confirmed the inference, which showed good symmetrical rectangular shape, and the specific capacitance was calculated about 186 F/g at a scan rate of 2 mV/s. After 1000 cycles of CV at 10 mV/s, the initial capacitance was maintained at about 91%, indicating that the designed structure had benefit to high electrochemical stability.