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High performance flexible double-sided micro-supercapacitors with an organic gel electrolyte containing a redox-active additive
Category : International Journal Editor : 김도연(제1저자), 이금비(제2저자), 하정숙(교신저자) Published Date : 2016.07.28 Publications : Nanoscale
In this study, we report the fabrication of a high performance flexible micro-supercapacitor (MSC) with an
organic gel electrolyte containing a redox-active additive, referred to as poly(methyl methacrylate)-propylene
carbonate-lithium perchlorate-hydroquinone (PMMA-PC-LiClO4-HQ). Hexagonal MSCs fabricated
on thin polyethylene terephthalate (PET) films had interdigitated electrodes made of spray-coated multiwalled
carbon nanotubes (MWNTs) on Au. The addition of HQ as a redox-active additive enhanced not
only the specific capacitance but also the energy density of the MSCs dramatically, which is approximately
35 times higher than that of MSCs without the HQ additive. In addition, both areal capacitance and areal
energy density could be doubled by fabrication of double-sided MSCs, where two MSCs are connected in
parallel. The double-sided MSCs exhibited stable electrochemical performance during repeated deformation
by bending. By dry-transferring the double-sided MSCs based on PMMA-PC-LiClO4-HQ on a
deformable polymer substrate, we fabricated a stretchable MSC array, which also retained its electrochemical
performance during a uniaxial strain of 40%. Furthermore, a wearable energy storage bracelet
made of such an MSC array could operate a μ-LED on the wrist.
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