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Issue 57, 2019
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In situ K2S activated electrospun carbon nanofibers with hierarchical meso/microporous structures for supercapacitors

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Abstract

Porous electrospun carbon nanofibers (CNFs) can be produced by a more advantageous ‘in situ activation’ method by electrospinning polyacrylonitrile (PAN) with an activation agent. However, most in situ activated electrospinning processes yield porous CNFs with rather limited surface area and less porosity due to the inappropriately selected activation agents. Here we found K2S could perfectly meet both compatibility and reactivity requirements of PAN electrospinning to generate hierarchical meso/micropores inside electrospun CNFs. During the whole fabrication process, K2S experiences a phase evolution loop and the hierarchical pore structures are formed by the reaction between K2S oxidative derivatives and the as-formed carbon during heat treatment. The hierarchical meso/microporous CNFs not only showed a large surface area (835.0 m2 g−1) but also exhibited a high PAN carbonization yield (84.0 wt%) due to improved cyclization of PAN's nitrile group during the pre-oxidation stage. As an electrode material for supercapacitors, the corresponding electrodes have a capacitance of 210.7 F g−1 at the current density of 0.2 A g−1 with excellent cycling durability. The hierarchically porous CNFs produced via in situ activation by K2S combine the advantages of interconnected meso/micropores and are a promising candidate for electrochemical energy conversion and storage devices.

Graphical abstract: In situ K2S activated electrospun carbon nanofibers with hierarchical meso/microporous structures for supercapacitors

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Publication details

The article was received on 29 Aug 2019, accepted on 10 Oct 2019 and first published on 18 Oct 2019


Article type: Paper
DOI: 10.1039/C9RA06847C
RSC Adv., 2019,9, 33539-33548
  • Open access: Creative Commons BY-NC license
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    In situ K2S activated electrospun carbon nanofibers with hierarchical meso/microporous structures for supercapacitors

    H. Liu, W. Song and A. Xing, RSC Adv., 2019, 9, 33539
    DOI: 10.1039/C9RA06847C

    This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

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