A carbon modified MnO2 nanosheet array as a stable high-capacitance supercapacitor electrode
A carbon modified MnO2 nanosheet array as a stable high-capacitance supercapacitor electrode
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碳修饰的MnO2纳米片阵列作为稳定的高电容超级电容器电极
DOI：
10.1039/c3ta12148h
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发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Liu, Jinping
中科院分区：
文献类型：
--
作者：
Huang, Yu;Li, Yuanyuan;Liu, Jinping
通过简单的水热方法，在钛箔集流体上合成了碳改性二氧化锰（MnO2@C）纳米片阵列，然后将预吸附到纳米片上的葡萄糖碳化。 MnO2@C纳米片在集流体上的直接生长导致增强的电子传输/收集和更充分的离子吸附-解吸。事实证明，碳改性可以增强 MnO2 的电导率。通过有序阵列电极结构与导电碳的完美结合，我们的 MnO2@C 纳米片阵列显示出明确的电容特性，具有高重量电容和面积电容（∼622 F g−1 和 143 mF cm−2；远高于我们的原始 MnO2 薄膜和其他报道的 MnO2 电极）、良好的倍率性能和高达 4000 次的出色循环稳定性 次（仅损失 5.9%）。本研究提供了一种设计高性能二氧化锰基超级电容器电极的替代方法，并且该概念可扩展到其他赝电容电极。
A carbon-modified manganese dioxide (MnO2@C) nanosheet array has been synthesized on a titanium foil current collector via a facile hydrothermal method followed by carbonization of glucose pre-adsorbed onto the nanosheets. The direct growth of MnO2@C nanosheets on a current collector leads to enhanced electron transport/collection and more sufficient ion adsorption–desorption. Carbon modification proves to enhance the electrical conductivity of MnO2. With the elegant combination of ordered array electrode architecture with conductive carbon, our MnO2@C nanosheet array displays well-defined capacitive features with both high gravimetric and areal capacitances (∼622 F g−1 and 143 mF cm−2; much higher than those of our pristine MnO2 film and other reported MnO2 electrodes), good rate capability and outstanding cycling stability up to 4000 times (only 5.9% loss). The present study provides an alternative way to design a high-performance MnO2-based supercapacitor electrode and the concept is extendable to other pseudocapacitive electrodes.