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

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

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

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.

Original languageBritish English
Pages (from-to)335-342
Number of pages8
JournalCarbon
Volume143
DOIs
StatePublished - Mar 2019

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