Large-Scale Synthesis of Metal-Ion-Doped Manganese Dioxide for Enhanced Electrochemical Performance

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• 作者：Ruichao Peng ; Nian Wu ; Yu Zheng ; Yangbo Huang ; Yunbai Luo ; Ping Yu ; Lin Zhuang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：April 6, 2016
• 年：2016
• 卷：8
• 期：13
• 页码：8474-8480
• 全文大小：567K
• ISSN：1944-8252

文摘

One-dimensional (1D) MnO₂ was widely applied in areas of enzyme biosensors, industrial sieves, and energy storage materials owing to its excellent thermal, optical, magnetic, and chemical features. However, its practical application into energy storage devices is often hindered by the bad electronic conductivity (from 10^–5 to 10^–6 S cm^–1). As is widely known, doping with hetero elements is an efficient way to enhance the electronic conductivity of metal oxides. Herein, a novel and simple molten-salt method is developed to achieve a large-scale preparation of 1D MnO₂ nanowires. Such an approach also realizes the easy tuning of electrical properties through doping with different transition metal ions. On the basis of first-principle calculation as well as four-probe measurement, we determined that the conductivity of the doped MnO₂ nanowires can be promoted efficiently by utilizing such protocol. Meanwhile, a possible doping route is discussed in detail. As a result, a superior electrochemical performance can be observed in such metal ions (M⁺)-doped nanowires. Such high-quality M⁺-doped MnO₂ nanowires can satisfy a broad range of application needs beyond the electrochemical capacitors.