Vanadium redox flow battery using electrocatalyst decorated with nitrogen-doped carbon nanotubes derived from metal-organic frameworks

Chanho Noh, Chang Soo Lee, Won Seok Chi, Yongjin Chung, Jong Hak Kim, Yongchai Kwon

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Highly porous zeolitic-imidazole frameworks (ZIFs) are synthesized to produce N-doped mesoporous carbon electrocatalysts via calcination. The N-doped carbon (m-NC) and carbon nanotubes (m-NCNT) are obtained from ZIF-8 and ZIF-67, while the core-shell structure of ZIF-8@ZIF-67 produced with ZIF-8 seeds (m-NC@NCNT) is prepared by hydrothermal method. Chemical and optical evaluations of the catalysts are characterized using BET, FT-IR, XPS, XRD, Raman spectroscopy and SEM/STEM and they are used as the catalysts for redox reactions of vanadium ions and redox flow battery (VRFB) performance. In the utilization, m-NC@NCNT and m-NCNT are effective for improving VO2+/VO2 + redox reaction, although m-NC does not influence that. Even in VRFB tests using the catalysts, charge/discharge potential and energy efficiency (EE) of m-NC@NCNT and m-NCNT are highest, not to mention excellent EE resilience after undergoing tougher cycling condition. These results are due to the large graphitic-N portion of the two catalysts. Namely, electrons produced by the graphitic-N are delocalized, forming pi-conjugated system and vanadium–nitrogen transition state. This state then promotes electron transfer during VO2+/VO2 + redox reaction and VRFB performance.

Original languageEnglish
Pages (from-to)A1388-A1399
JournalJournal of the Electrochemical Society
Volume165
Issue number7
DOIs
Publication statusPublished - 2018 Jan 1

Fingerprint

Vanadium
Carbon Nanotubes
Electrocatalysts
Redox reactions
Carbon nanotubes
Nitrogen
Metals
Catalysts
Energy efficiency
Ions
Carbon
Electrons
Electron transitions
Calcination
Seed
Raman spectroscopy
X ray photoelectron spectroscopy
Scanning electron microscopy
Flow batteries
imidazole

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

Noh, Chanho ; Lee, Chang Soo ; Chi, Won Seok ; Chung, Yongjin ; Kim, Jong Hak ; Kwon, Yongchai. / Vanadium redox flow battery using electrocatalyst decorated with nitrogen-doped carbon nanotubes derived from metal-organic frameworks. In: Journal of the Electrochemical Society. 2018 ; Vol. 165, No. 7. pp. A1388-A1399.
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Vanadium redox flow battery using electrocatalyst decorated with nitrogen-doped carbon nanotubes derived from metal-organic frameworks. / Noh, Chanho; Lee, Chang Soo; Chi, Won Seok; Chung, Yongjin; Kim, Jong Hak; Kwon, Yongchai.

In: Journal of the Electrochemical Society, Vol. 165, No. 7, 01.01.2018, p. A1388-A1399.

Research output: Contribution to journalArticle

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