In situ synthesis of ultrafine β-MnO2/polypyrrole nanorod composites for high-performance supercapacitors
In situ synthesis of ultrafine β-MnO2/polypyrrole nanorod composites for high-performance supercapacitors
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DOI：
10.1039/c1jm11491c
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发表时间：
2011-07
影响因子：
--
通讯作者：
Jianfeng Zang;Xiaodong Li
中科院分区：
文献类型：
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作者：
Jianfeng Zang;Xiaodong Li
我们报告了一个值得注意的观察结果，这与β-MnO 2被认为是超级电容器应用的不受欢迎的候选者的既定观点不一致。β-MnO 2的比电容可高达294 F g−1，与最佳晶体结构（如α-MnO 2）相当。关键是将β-MnO 2粉末的尺寸大幅减小到超小范围。我们展示了一种简便、有效的方法来合成超细（直径<10 nm）β-MnO 2/聚吡咯纳米棒复合粉末，用于高性能超级电容器电极。我们的观察可能会鼓励重新审视其他好的甚至是坏的候选活性材料，如果我们可以将它们的尺寸减小到非常小的尺度。此外，提出的合成机理和开发的合成策略可以提供设计指导，在合成其他储能材料的超细一维纳米结构。
We report a remarkable observation that is at odds with the established notion that β-MnO2 was regarded as an undesirable candidate for supercapacitor applications. The specific capacitance of β-MnO2 can reach as high as 294 F g−1, which is comparable to the best crystallographic structure, like α-MnO2. The key is to substantially decrease the size of β-MnO2 powders to ultra small regime. We demonstrate a facile, simple, and effective approach to synthesizing ultrafine (<10 nm in diameter) β-MnO2/polypyrrole nanorod composite powders for high-performance supercapacitor electrodes. Our observation may encourage a revisit of the other good or even bad candidate active materials if we can decrease their size to extremely small scales. In addition, the proposed synthetic mechanism and the developed synthetic strategy may provide design guidelines in synthesizing other energy storage materials toward ultrafine 1D nanostructures.