Abstract Ultrathin MnO2 nanosheets grown on the surface of hollow carbon spheres (MnO2/HCSs) were fabricated by the redox reaction between carbon spheres with KMnO4 in aqueous solution. Due to the porous structure and large amounts of active sites, MnO2/HCSs exhibit excellent capacitive performance with 227.5 F g−1 at 1 A g−1. After 5000 cycles, the capacity retention of MnO2/HCSs remains 96%, indicating its good cycling stability. These results demonstrate that MnO2/HCSs are promising supercapacitor electrode material and this work provide a facile method for growth of ultrathin MnO2 nanosheets on carbon substrate.

中文翻译：

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在具有增强电容性能的空心碳球上生长的超薄 MnO2 纳米片

摘要 通过碳球与 KMnO4 在水溶液中的氧化还原反应制备了生长在空心碳球表面的超薄 MnO2 纳米片 (MnO2/HCSs)。由于多孔结构和大量活性位点，MnO2/HCSs 表现出优异的电容性能，在 1 A g-1 时为 227.5 F g-1。5000 次循环后，MnO2/HCSs 的容量保持率保持在 96%，表明其良好的循环稳定性。这些结果表明 MnO2/HCSs 是很有前途的超级电容器电极材料，这项工作为在碳基底上生长超薄 MnO2 纳米片提供了一种简便的方法。