Freestanding Ion Gels for Flexible, Printed, Multifunctional Microsupercapacitors

Donghoon Song, Fazel Zare Bidoky, Ethan B. Secor, Mark C. Hersam, C. Daniel Frisbie*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Freestanding ion gels (FIGs) provide unique opportunities for scalable, low-cost fabrication of flexible microsupercapacitors (MSCs). While conventional MSCs employ a distinct electrolyte and substrate, FIGs perform both functions, offering new possibilities for device integration and multifunctionality while maintaining high performance. Here, a capillarity-driven printing method is demonstrated to manufacture high-precision graphene electrodes on FIGs for MSCs. This method achieves excellent self-alignment and resolution (width: 50 μm, interdigitated electrode footprint: <1 mm 2 ) and 100% fabrication yield (48/48 devices) and is readily generalized to alternative electrode materials including multiwalled carbon nanotubes (MWCNTs). The devices demonstrate good performance, including high specific capacitance (graphene: 0.600 mF cm -2 MWCNT: 6.64 mF cm -2 ) and excellent stability against bending, folding, and electrical cycling. Moreover, this strategy offers unique opportunities for device design and integration, including a bifacial electrode structure with enhanced capacitance (graphene: 0.673 mF cm -2 MWCNT: 7.53 mF cm -2 ) and improved rate performance, print-and-place versatility for integration on diverse substrates, and multifunctionality for light emission and transistor gating. These compelling results demonstrate the potential of FIGs for scalable, low-cost fabrication of flexible, printed, and multifunctional energy storage devices.

Original languageEnglish (US)
Pages (from-to)9947-9954
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number10
StatePublished - Mar 13 2019


  • flexible foldable microsupercapacitors
  • freestanding ion gels
  • multifunctional devices
  • pristine graphene ink
  • self-aligned printing

ASJC Scopus subject areas

  • Materials Science(all)


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