writer：Y. P. Huang, Z. Y. Liang, Y. E. Miao, T. X. Liu*
keywords：Mesoporous Dual-Layer MnO2 Nanotubes, Supercapacitors
source：期刊
specific source：ChemNanoMat, 2015, 1(3), 159-166.
Issue time：2015年
Mesoporous dual-layer MnO₂ nanotubes assembled from well-aligned MnO₂ nanosheets are synthesized via a facile and efficient sacrificial template method. To begin with, the self-standing carbon nanofibrous membranes are prepared via electrospinning and high-temperature carbonization, followed by an in situ redox reaction in KMnO₄ solution to coat the carbon nanofiber (CNF) template with MnO₂ nanosheets until the CNFs are consumed. The synthesized dual-layer MnO₂ nanotubes are composed of an inner shell of packed MnO₂, and an outer shell of mesoporous sheetlike MnO₂. Importantly, the dimensions of the MnO₂ nanotubes can be easily controlled by tuning parameters including CNF diameter and redox reaction temperature. The MnO₂ nanotube electrode thus prepared manifests excellent cycling stability with a specific capacitance of 231 F g^-1 and an areal capacitance of 309 mF cm^-2 for supercapacitors. This approach opens up a new way for designing MnO₂ nanostructures as promising electrode materials.