Journal
NANO ENERGY
Volume 78, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105356
Keywords
Graphene; Porous structures; Supercapacitors; Flexible devices; E-skin devices; Power-sources
Categories
Funding
- National Research Foundation of Korea [2018R1A5A1025511]
- Basic Research Project of the Korea Institute of Geoscience and Mineral Resources - Ministry of Science and ICT of Korea [20-3212-1]
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The development of multifunctional devices on highly flexible and biocompatible substrates has received great attention in the field of wearable and healthcare technologies. To realize such a unique technology typically on a single platform, it is very crucial to adopt highly-flexible and embeddable energy storage devices with adequate efficiencies as power sources. In this direction, we introduce a versatile and scalable approach to fabricate planar and symmetric micro-supercapacitors, which can be mounted on any complicated surface. The microsupercapacitors developed on highly flexible and ultrathin substrates by the angular spray of graphene-ink showed excellent performance with a maximum areal capacitance of similar to 8.38 mF/cm(2) and operating flexibility for a bending radius of 1.8 mm. The devices also displayed outstanding mechanical stability for 10,000 bending cycles with a high specific capacitance (-22 F/g) and power density (similar to 1.13 kW/kg) typically at a scan rate of 100 mV/s. Further, the demonstrations on skin-mountable and wrappable characteristics of mSCs emphasized their adaptability as embeddable power sources for various epidermal and wearable devices.
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