Water-dispersible graphene/polyaniline composites for flexible micro-supercapacitors with high energy densities
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AbstractLightweight and mechanically compliant energy storage devices have attracted tremendous interest due to the increasing demand for flexible and miniaturized electronics. Recently, microsupercapacitors (MSCs) have advanced rapidly as potential micro-sized power sources, but it is still challenging to build the micro-device using cost-effective technologies for large-scale manufacture. Here, we developed a simple solution-processible method to fabricate microelectrode patterns using a water-dispersible graphene/sulfonated polyaniline (rG/SP) as the active MSC material. The highly stabilized rG/SP dispersion in aqueous solution enables the direct thin-film deposition on flexible substrates and the formation of interdigital patterns by plasma etching. The as-fabricated solid-state MSC delivers an ultrahigh areal capacitance of 3.31 mF/cm(2) and volumetric stack capacitance of 16.55 F/cm(3) with excellent rate and cycling performance. Furthermore, the rG/SP based MSC demonstrates a superior energy density of 1.51 mW h/cm(3) while maintaining high power density. The micro-device also shows superior mechanical stability with 96.5% of capacitance retained under different bending and twisting conditions, which makes it suitable specifically for portable and wearable electronic applications. (C) 2015 Published by Elsevier Ltd.
All Author(s) ListSong B, Li LY, Lin ZY, Wu ZK, Moon KS, Wong CP
Journal nameNano Energy
Volume Number16
Pages470 - 478
LanguagesEnglish-United Kingdom
KeywordsFlexible electronics; Graphene; High energy density; Microsupercapacitors; Shadow mask; ulfonated polyaniline
Web of Science Subject CategoriesChemistry; Chemistry, Physical; Materials Science; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; Physics; Physics, Applied; Science & Technology - Other Topics

Last updated on 2020-18-09 at 02:14