Knitted and screen printed carbon-fiber supercapacitors for applications in wearable electronics

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Kristy Jost,ab   Daniel Stenger,a   Carlos R. Perez,a   John K. McDonough,a   Keryn Lian,c   Yury Gogotsia and   Genevieve Dionb

aDepartment of Materials Science and Engineering & A.J. Drexel Nanotechnology Institute, Drexel University, 3141 Chestnut Street, Philadelphia, USA
 bShima Seiki Haute Technology Laboratory, ExCITe Center, Drexel University, 3401 Market Street, Philadelphia, USA
    cDepartment of Materials Science and Engineering, University of Toronto, Canada
Abstract
energy textiles
The field of energy textiles is growing but continues to face two main challenges: (1) flexible energy storage does not yet exist in a form that is directly comparable with everyday fabrics including their feel, drape and thickness, and (2) in order to produce an “energy textile” as part of a garment, it must be fabricated in a systematic manner allowing for multiple components of e-textiles to be integrated simultaneously. To help address these issues, we have developed textile supercapacitors based on knitted carbon fibers and activated carbon ink. We show capacitances as high as 0.51 F cm−2 per device at 10 mV s−1, which is directly comparable with those of standard activated carbon film electrodes tested under the same conditions. We also demonstrate the performance of the device when bent at 90°, 135°, 180° and when stretched.
This is the first report on knitting as a fabrication technique for integrated energy storage devices.
 
Published in Energy Environ. Sci., 2013,6, 2698-2705, DOI: 10.1039/C3EE40515J
 

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