Freestanding electrodes based on nitrogen-doped carbon nanofibers and zeolitic imidazolate framework-derived ZnO for flexible supercapacitors

Hao Gao, Bhavana Joshi, Edmund Samuel, Ashwin Khadka, Si Wung Kim, Ali Aldalbahi, Mohamed El-Newehy, Sam S. Yoon

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

This study investigates the carbonization of electrospun fibers derived from zeolitic imidazolate framework (ZIF)-7/polyacrylonitrile solutions containing urea or polyvinylpyrrolidone (PVP). The carbonization yields highly flexible composites comprising nitrogen-doped carbon nanofibers and ZnO. Notably, using PVP as a nitrogen source generates a composite exhibiting excellent electrochemical performance. Specifically, it delivers a high capacitance of 382.5 mF cm−2 at a current density of 1 mA cm−2. Furthermore, this composite demonstrates capacitance retentions of approximately 101 % and 80 % after 10,000 cycles and a 90° bending test, respectively. The charge-storage capability of the PVP-based ZnOP/C composite surpasses that obtained without PVP by 1.4 times. Additionally, a composite fiber mat of ZnOP/C obtained via one-step electrospinning exhibits exceptional electrical conductivity and an energy density of 49 μWh cm−2 at a power density of 2 mW cm−2. These findings highlight the potential of this material as an electrode for supercapacitors.

Original languageEnglish
Article number159221
JournalApplied Surface Science
Volume651
DOIs
Publication statusPublished - 2024 Apr 1

Bibliographical note

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • Carbon nanofiber
  • Electrospinning
  • Flexible supercapacitor
  • Freestanding electrode
  • ZIF-7

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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