A Shape Memory High-Voltage Supercapacitor with Asymmetric Organic Electrolytes for Driving an Integrated NO 2 Gas Sensor

Changhoon Song, Junyeong Yun, Hanchan Lee, Heun Park, Yu Ra Jeong, Geumbee Lee, Min Su Kim, Jeong Sook Ha

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A high-voltage supercapacitor with shape memory for driving an integrated NO 2 gas sensor is fabricated using a Norland Optical Adhesive 63 polymer substrate, which can recover the original shape after deformation by short-time heating. The supercapacitor consists of multiwalled carbon nanotube electrodes and organic electrolyte. By using organic electrolyte consisting of adiponitrile, acetonitrile, and dimethyl carbonate in an optimized volume ratio of 1:1:1, a high operation voltage of 2 V is obtained. Furthermore, asymmetric electrolytes with different redox additives of hydroquinone and 1,4-dihydroxyanthraquinone to the anode and cathode, respectively, enhance both capacitance and energy density by ≈40 times compared to those of supercapacitor without redox additives. The fabricated supercapacitor on the Norland Optical Adhesive 63 polymer substrate retains 95.8% of its initial capacitance after 1000 repetitive bending cycles at a bending radius of 3.8 mm. Furthermore, the folded supercapacitor recovers its shape upon heating at 70 °C for 20 s. In addition, 90% of the initial capacitance is retained even after the 20th shape recovery from folding. The fabricated supercapacitor is used to drive integrated NO 2 gas sensor on the same Norland Optical Adhesive 63 substrate attached onto skin to detect NO 2 gas, regardless of deformation due to elbow movement.

Original languageEnglish
Article number1901996
JournalAdvanced Functional Materials
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • 1,4-dihydroxyanthraquinone
  • asymmetric electrolytes
  • high-voltage supercapacitor
  • hydroquinone
  • shape memory
  • wireless powering

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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