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Issue 36, 2017
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δ-MnO2 nanofiber/single-walled carbon nanotube hybrid film for all-solid-state flexible supercapacitors with high performance

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Abstract

δ-MnO2 ultralong nanofibres with smooth surface, good dispersion and a large length-to-width ratio were first controllably prepared by hydrothermally treating δ-MnO2 with low crystallinity at 150 °C for 20 h in 1 M NaOH. δ-MnO2 nanofiber/single-walled carbon nanotube (SWCNT) hybrid film electrodes with excellent flexibility and high capacitance were obtained between the δ-MnO2 nanofibre and SWCNTs via a simple vacuum filtration method. The formed regular fibrous network structure and a synergistic effect between the SWCNTs and δ-MnO2 nanofiber make the δ-MnO2/SWCNT-15 hybrid film electrode show a larger areal specific capacitance of 964 mF cm−2 at a current density of 1 mA cm−2 and excellent capacity retention of 81% when the current density was increased from 1 to 10 mA cm−2. By using δ-MnO2/SWCNT-15 film electrodes, a flexible all-solid-state δ-MnO2/SWCNT-15 hybrid supercapacitor was assembled by sandwiching the PVA–KOH solid-state electrolyte, which not only showed good flexibility and mechanical properties, but also gave a high energy density of 31.8 μW h cm−2 at a power density of 0.815 mW cm−2. δ-MnO2 nanofibre/SWCNTs hybrid film flexible supercapacitors have great potential in future portable and wearable electronic applications due to their excellent flexibility, high energy density, good cycle life and coulombic efficiency.

Graphical abstract: δ-MnO2 nanofiber/single-walled carbon nanotube hybrid film for all-solid-state flexible supercapacitors with high performance

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Publication details

The article was received on 31 May 2017, accepted on 14 Aug 2017 and first published on 14 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA04712F
Citation: J. Mater. Chem. A, 2017,5, 19107-19115
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    δ-MnO2 nanofiber/single-walled carbon nanotube hybrid film for all-solid-state flexible supercapacitors with high performance

    L. Wang, M. Huang, S. Chen, L. Kang, X. He, Z. Lei, F. Shi, H. Xu and Z. Liu, J. Mater. Chem. A, 2017, 5, 19107
    DOI: 10.1039/C7TA04712F

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