Carbon Nanotube/Manganese Oxide Ultrathin Film Electrodes for Electrochemical Capacitors

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• 作者：Seung Woo Lee ; Junhyung Kim ; Shuo Chen ; Paula T. Hammond ; Yang Shao-Horn
• 刊名：ACS Nano
• 出版年：2010
• 出版时间：July 27, 2010
• 年：2010
• 卷：4
• 期：7
• 页码：3889-3896
• 全文大小：608K
• 年卷期：0
• ISSN：1936-086X

文摘

Multiwall carbon nanotube (MWNT)/manganese oxide (MnO₂) nanocomposite ultrathin film electrodes have been created via redox deposition of MnO₂ on layer-by-layer (LbL)-assembled MWNT films. We demonstrate that these LbL-assembled MWNT (LbL-MWNT)/MnO₂ thin films consist of a uniform coating of nanosized MnO₂ on the MWNT network structure using SEM and TEM, which is a promising structure for electrochemical capacitor applications. LbL-MWNT/MnO₂ electrodes yield a significantly higher volumetric capacitance of 246 F/cm³ with good capacity retention up to 1000 mV/s due to rapid transport of electrons and ions within the electrodes. The electrodes are generated with two simple aqueous deposition processes: the layer-by-layer assembly of MWNTs followed by redox deposition of MnO₂ at ambient conditions, thus providing a straightforward approach to the fabrication of high-power and -energy electrochemical capacitors with precise control of electrode thickness at nanometer scales.