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Supercapacitor of Extraordinary Cycling Stability and High Rate from Nano-Architectured Polyaniline/Graphene on Janus Nanofibrous Film with Shape Memory

Abstract

Polyaniline (PAni) is a promising high-capacitance material but its poor cycle life, limited rate capability and low power density limit its practical application as an electrode material for supercapacitors. PAni is commonly combined with graphene to enhance its performance, yet few studies have tackled drawbacks of PAni altogether. To address all limitations of PAni, a novel flexible electrode is developed by growing PAni nanowires on graphene-coated polyvinyl alcohol (PVA) nanofibers followed by second coating with graphene sheets as nano-sized charge collectors. Chemical stability, wettability, light weight and large surface area of nanofibrous crosslinked PVA make it an ideal cushiony support for electrode materials. Shear-exfoliated graphene is employed as an inexpensive source of graphene to enhance capacitive performance of PAni through sensible engineering of the hierarchical nanostructure. The assembled supercapacitor from the flexible composite electrode demonstrated an enhanced rate capability and power density as well as an exceptional cycling performance. The cushiony PVA substrate together with the first layer of graphene contribute to retaining the capacitive performance of the PAni-based supercapacitor for 88k cycles of charge-discharge. In addition to supercapacitor application, a PAni-coated PVA film exhibits a rapid shape memory effect on the basis of expansion and contraction of PAni upon acid doping and base dedoping. PAni-coated PVA films are further employed for fast detection of ammonia, HCl and humidity. The simple strategy to construct a flexible composite electrode together with shape memory and sensing properties offers new potential for flexible supercapacitors as well as chemo-mechanical actuation and sensing devices.

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Publication details

The article was received on 01 Aug 2018, accepted on 28 Sep 2018 and first published on 28 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA07426G
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Supercapacitor of Extraordinary Cycling Stability and High Rate from Nano-Architectured Polyaniline/Graphene on Janus Nanofibrous Film with Shape Memory

    A. khosrozadeh, S. Gurankit, Q. Wang, G. Luo and M. Xing, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA07426G

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