Hierarchical ZIF-67 of dodecahedral structure on binder-free carbon nanofiber for flexible supercapacitors

Ashwin Khadka, Edmund Samuel, Yong Il Kim, Chanwoo Park, Hae Seok Lee, Sam S. Yoon

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Binder-free, highly flexible carbon nanofibers decorated with ZIF-67 dodecahedral structures are synthesized via electrospinning and impregnation for use in supercapacitor applications. Because cobalt ions from ZIF-67 are highly attracted to carbon rings and the oxygen functional groups of polyvinylpyrrolidone (PVP), the concentration of PVP is varied to tune the morphology of ZIF-67. Accordingly, morphology tuning via PVP inclusion enhances the electron transfer within the ZIF-67-derived CoOx dodecahedral structure. Parametric studies are conducted to investigate the effect of PVP concentration on the electrochemical performance of carbon nanofibers decorated with ZIF-67. The optimal sample yields a capacitance of 444 mF⋅cm2 at a current rate of 5 mA⋅cm2. The corresponding capacitance retention is 94 % after 30,000 cycles with a potential window of 1 V. Furthermore, the energy density increases by 262.7 % when the potential window is increased from 1 to 1.5 V. These results confirm the long-term stability and outstanding energy-storage capabilities of the fabricated supercapacitor electrodes.

Original languageEnglish
Pages (from-to)458-468
Number of pages11
JournalJournal of Industrial and Engineering Chemistry
Volume118
DOIs
Publication statusPublished - 2023 Feb 25

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government NRF-2020R1A5A1018153, NRF-2021R1A2C2010530, and 2022M3J1A106422611. This research was also supported by Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare, Republic of Korea (HI21C0049010021).

Publisher Copyright:
© 2022 The Korean Society of Industrial and Engineering Chemistry

Keywords

  • Binder free
  • Carbon nanofiber
  • Dodecahedral structure
  • Flexible supercapacitor
  • ZIF-67

ASJC Scopus subject areas

  • General Chemical Engineering

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