Electrospun zinc-manganese bimetallic oxide carbon nanofibers as freestanding supercapacitor electrodes

Bhavana Joshi, Edmund Samuel, Yongil Kim, Taegun Kim, Mohamed El-Newehy, Ali Aldalbahi, Sam S. Yoon

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Flexible, lightweight, and freestanding zinc-manganese oxide carbon nanofibers are promising materials for the fabrication of portable electronic devices. Composite nanofibers were synthesized using terephthalic acid and sodium dodecyl sulfate. Terephthalic acid improves the flexibility of the composite fibers and facilitates the diffusion of electrolytic ions. Meanwhile, sodium dodecyl sulfate aids to elevate the metal (zinc) oxide particles to the surface of the nanofibers during annealing. The texturing of the carbon nanofiber surface with ZnO enhances the electrochemical activity of the composite fibers. Parametric studies were conducted by varying the weight ratio of zinc and manganese acetates from zero to unity. The optimal case with a ratio of 0.75 produces specific capacitances of 1080 and 817 F·g−1 at current densities of 1 and 10 A·g−1, respectively, with a wide potential window of 1.6 V, indicating outstanding energy storage capabilities. The capacitance retention was 92% after 10 000 galvanostatic charge-discharge cycles. The bending angle test confirmed the mechanical durability of the freestanding carbon nanofiber electrodes, and the corresponding change in the cyclic voltammetry curve was negligible.

Original languageEnglish
Pages (from-to)22100-22112
Number of pages13
JournalInternational Journal of Energy Research
Volume46
Issue number15
DOIs
Publication statusPublished - 2022 Dec

Keywords

  • ZnMnO
  • electrospinning
  • freestanding electrode
  • high-energy-density
  • supercapacitor

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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