Hierarchical zeolitic imidazolate framework-derived manganese-doped zinc oxide decorated carbon nanofiber electrodes for high performance flexible supercapacitors

Edmund Samuel, Bhavana Joshi, Min Woo Kim, Yong Il Kim, Mark T. Swihart, Suk Goo Yoon

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We demonstrate freestanding, flexible, and cost-effective supercapacitor electrodes comprising carbon nanofibers (CNFs) decorated with metal oxide framework (MOF)-derived manganese-doped zinc oxide (Mn@ZnO). Nanoparticles of manganese-doped zeolitic imidazolate framework (ZIF-8) were grown directly on electrospun polyacrylonitrile nanofibers by a simple solution-phase synthesis. Carbonization of these composite fibers produced high surface area dodecahedral Mn@ZnO on core CNFs that provide fast electron-transfer pathways. The synergy between Mn@ZnO (active sites for Faradaic reactions) and the highly electrically conductive carbon nanofiber improves the performance of the supercapacitor electrode. The Mn@ZnO/CNF electrodes exhibit a high specific capacitance of 501 F·g −1 and retain >92% of their initial capacitance after 10,000 cycles. The optimized Mn@ZnO/CNF electrodes deliver impressive energy densities of 72.1 W·h·kg −1 and 33.3 W·h·kg −1 at power densities of 500 W·kg −1 and 5000 W·kg −1 , respectively. This electrochemical performance demonstrates that the Mn@ZnO/CNF nanostructured composite is a robust electrode material for long-lifetime high-rate energy storage/delivery devices.

Original languageEnglish
Pages (from-to)657-665
Number of pages9
JournalChemical Engineering Journal
Volume371
DOIs
Publication statusPublished - 2019 Sep 1

Keywords

  • Carbon nanofiber
  • Electrospinning
  • Mn/ZIF-8
  • Supercapacitor

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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