Cable-like double-carbon layers for fast ion and electron transport: An example of CNT@NCT@MnO2 3D nanostructure for high-performance supercapacitors

A unique nanostructure consisting of CNTs as carbon matrix, and were sequentially coated with silicon dioxide, N-doped porous carbon tube (NCT) and MnO2 nanoflowers, the final CNT@NCT@MnO2 composites with large internal voids between CNT and NCT. CNT@NCT@MnO2 combines the nanostructural advantages of internal voids and the N-doped porous carbon, presenting fast diffusion paths for ions and electrons, high conductivity and large surface areas. When used as an anode material in supercapacitors, the CNT@NCT@MnO2 tube-in-tube hierarchical nanostructure exhibite a remarkably excellent electrochemical behavior with a specific capacitance (Csp) of 210?F?g?1 at the current density of 0.5?A?g?1. Moreover, all-solid-state asymmetrical supercapacitors (ASCs) were fabricated using the CNT@NCT@MnO2 composites as anode and the CNT@NCT as cathode, Na2SO4/PVA gel as the electrolyte and the separator. The all-solid-state ASCs also show the superior performance, such as high energy density of ?14?Wh kg?1 and a power density of ?3.6?kW?kg?1.

» Author: Yinghui Wang, Deyang Zhang, Yang Lu, Weixiao Wang, Tao Peng, Yingge Zhang, Yan Guo, Yange Wang, Kaifu Huo, Jang-Kyo Kim, Yongsong Luo

» Reference: 10.1016/j.carbon.2018.11.034

» Publication Date: 01/03/2019

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This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement Nº 768737


                   




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