Incorporation of Homogeneous, Nanoscale MnO2 within Ultraporous Carbon Structures via Self-Limiting Electroless Deposition: Implications for Electrochemical Capacitors

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• 作者：Anne E. Fischer ; Katherine A. Pettigrew ; Debra R. Rolison ; Rhonda M. Stroud ; Jeffrey W. Long
• 刊名：Nano Letters
• 出版年：2007
• 出版时间：February 2007
• 年：2007
• 卷：7
• 期：2
• 页码：281 - 286
• 全文大小：469K
• 年卷期：v.7,no.2(February 2007)
• ISSN：1530-6992

文摘

The self-limiting reaction of aqueous permanganate with carbon nanofoams produces conformal, nanoscopic deposits of birnessite ribbonsand amorphous MnO₂ throughout the ultraporous carbon structure. The MnO₂ coating contributes additional capacitance to the carbon nanofoamwhile maintaining the favorable high-rate electrochemical performance inherent to the ultraporous carbon structure of the nanofoam. Such athree-dimensional design exploits the benefits of a nanoscopic MnO₂-carbon interface to produce an exceptionally high area-normalizedcapacitance (1.5 F cm^-2), as well as high volumetric capacitance (90 F cm^-3).