Designing ionophilic MXene-based organohydrogel electrolytes for high performance supercapacitor with wide-potential-window and anti-freezing properties

Juyoung Moon, Juyun Lee, Yun Chan Kang, Jong Hak Kim, Jung Tae Park, Seon Joon Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Supercapacitors based on organohydrogel electrolytes can function at subzero temperatures and demonstrate a large potential range. However, for the development of next-generation energy-storage technologies, improvements in the ionic conductivity, mechanical strength, and flexibility of organohydrogel electrolytes are required. We employed Ti3C2Tx, an ionophilic MXene, as a nanofiller in this study to improve the ionic conductivity of organohydrogel electrolytes. Strong affinity for Li+ ions and good dispersibility in water/glycerol were obtained by the hydroxyl group's abundance on the surface of the ionophilic MXene. Due to the enhanced Li-ion hopping through the plentiful hydroxyl groups, an antifreezing supercapacitor based on the MXene/poly(vinyl alcohol) organohydrogel electrolyte (MXPVA-OHE) displayed a gravimetric capacitance as high as 19.84 F g−1 at room temperature and 3.49 F g−1 at -20 °C. Due to their high ionic conductivity, wide potential window, and favorable post-freezing recyclability, MXPVA-OHE-based supercapacitors are thus excellent energy-storage devices.

Original languageEnglish
Article number143007
JournalElectrochimica Acta
Volume466
DOIs
Publication statusPublished - 2023 Oct 20

Bibliographical note

Funding Information:
The authors Juyoung Moon, and Juyun Lee contributed equally to this study. This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government (MSIT) (No.2022R1A2C4001844, No.2021R1C1C1006385). This work was also supported by the National Research Council of Science & Technology (NST) grant by the Korea government (MSIT) (CRC22031-000).

Publisher Copyright:
© 2023 The Author(s)

Keywords

  • Anti-freezing
  • Electrolyte
  • Ionic conductivity
  • MXene
  • Organohydrogel
  • Supercapacitor
  • Wide-potential-window

ASJC Scopus subject areas

  • General Chemical Engineering
  • Electrochemistry

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