Zeolitic imidazolate framework-7 textile-derived nanocomposite fibers as freestanding supercapacitor electrodes

Bhavana Joshi, Sera Park, Edmund Samuel, Hong Seok Jo, Seongpil An, Min Woo Kim, Mark T. Swihart, Je Moon Yun, Kwang Ho Kim, Suk Goo Yoon

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Zeolitic imidazole frameworks (ZIFs) are a class of metal organic frameworks (MOFs) with diverse energy-related applications. High-surface area materials derived from ZIFs can serve as electrodes with good long-term capacity retention. Herein, we demonstrate an electrospun ZIF7/carbon nanofiber (CNF) derived nanocomposite as a freestanding electrode for supercapacitors with excellent capacitance retention. The optimal ZIF7 composite nanofiber carbonized at 950 °C exhibited a specific capacitance of 202 F·g−1 at a current density of 1 A·g−1 and ~98% specific capacitance retention after 5000 charge–discharge cycles. N-doped nanoporous C and the Zn framework of ZIF7 composite fibers delivered an energy density of 42 W·h·kg−1 at a power density of 0.6 kW·kg−1. These scalable ZIF7/CNF composite textiles (30 × 10 cm2) can be used as freestanding supercapacitor electrodes without a separate substrate or current collector.

Original languageEnglish
Pages (from-to)239-247
Number of pages9
JournalJournal of Electroanalytical Chemistry
Volume810
DOIs
Publication statusPublished - 2018 Feb 1

Keywords

  • Electrospinning
  • Metal-organic frameworks
  • Nanoporous carbon
  • Supercapacitor
  • ZIF7

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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