Flexible self-charging supercapacitor based on graphene-Ag-3D graphene foam electrodes

Libu Manjakkal, Carlos García Núñez, Wenting Dang, Ravinder Dahiya

Research output: Contribution to journalArticle

55 Citations (Scopus)
14 Downloads (Pure)

Abstract

A flexible three-dimensional porous graphene foam-based supercapacitor (GFSC) is presented here for energy storage applications. With a novel layered structure of highly conductive electrodes (graphene-Ag conductive epoxy–graphene foam), forming an electrochemical double layer, the GFSC exhibits excellent electrochemical and supercapacitive performance. At a current density of 0.67 mA cm−2, the GFSCs show excellent performance with areal capacitance (38 mF cm−2) about three times higher than the values reported for flexible carbon-based SCs. The observed energy and power densities (3.4 µW h cm−2 and 0.27 mW cm−2 respectively) are better than the values reported for carbon-based SCs. Analyzed under static and dynamic bending conditions, the GFSCs are stable with up to 68% capacitance retention after 25000 charge–discharge cycles. The light-weight, cost-effective fabrication and no self-heating make the GFSCs a promising alternative to conventional source of energy in the broad power density ranging from few nW cm−2 to mW cm−2. In this regard, GFSC was integrated with a flexible photovoltaic cell resulting in a flexible self-charging power pack. This pack was successfully utilized to power continuously a wearable CuO nanorod based chemi-resistive pH sensor.
Original languageEnglish
Pages (from-to)604-612
Number of pages9
JournalNano Energy
Volume51
DOIs
Publication statusPublished - 25 Jun 2018
Externally publishedYes

Keywords

  • supercapacitor
  • graphene foam
  • self-powered systems
  • wearable systems
  • pH sensors
  • energy storage

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  • Research Output

    • 55 Citations
    • 1 Conference contribution
    • 1 Paper
    • 1 Article
    • 1 Review article

    Energy autonomous electronic skin

    García Núñez, C., Manjakkal, L. & Dahiya, R., 4 Jan 2019, In : NPJ Flexible Electronics. 3, 1, 24 p., 1.

    Research output: Contribution to journalReview article

    Open Access
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  • 115 Downloads (Pure)

    Energy autonomous eSkin

    Manjakkal, L., Nunez, C. G. & Dahiya, R., 9 Apr 2019.

    Research output: Contribution to conferencePaper

  • Energy autonomous eSkin

    Manjakkal, L., García Núñez, C. & Dahiya, R., 9 Apr 2019, SPIE Defense + Commercial Sensing: 2019, Baltimore, Maryland, United States. Micro- and Nanotechnology Sensors, Systems, and Applications XI. Baltimore: Society of Photo-Optical Instrumentation Engineers, Vol. 10982. 109821K. (Proceedings of SPIE; vol. 10982).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Open Access
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  • 95 Downloads (Pure)

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