Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 8, Pages 4608-4615Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5077843
Keywords
flexible microsupercapacitor; ionogel electrolyte; air stable; patterned electrolyte; all-solid-state
Funding
- National Research Foundation of Korea (NRF) - Korean government (MEST) [NRF-2013R1A2A1A01016165]
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We describe the fabrication of air-stable, high-performance, planar microsupercapacitors (MSCs) on a flexible poly(ethylene terephthalate) substrate with patterned ionogel electrolyte, i.e., poly(ethylene glycol) diacrylate/1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, and electrodes of spray-coated multiwalled carbon nanotubes. The flexible MSC showed good cyclability, retaining similar to 80% of initial capacitance after 30 000 cycles, and good mechanical stability down to a bending diameter of 3 mm under compressive stress; 95% of the initial capacitance was retained after 1000 bending cycles. The MSC had high electrochemical stability with retaining 90% of its initial capacitance for 8 weeks in air. Furthermore, vertical stacking of MSCs with patterned solid film of ionogel electrolyte could increase the areal capacitance dramatically. This flexible MSC has potential applications as an energy-storage device in micro/nanoelectronics, without encapsulation for air stability.
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