Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Improvement of Cathode Reaction of Vanadium Redox Flow Battery by Reforming Graphite Felt Electrode Using Cobalt Oxide

바나듐 레독스 흐름전지 양극 반응 향상을 위한 코발트 산화물 전극 개질법 연구

  • Park, Jeongmok (Department of Metallurgical Engineering, Pukyong National University) ;
  • Ko, Minseong (Department of Metallurgical Engineering, Pukyong National University)
  • 박정목 (부경대학교 금속공학과) ;
  • 고민성 (부경대학교 금속공학과)
  • Received : 2019.06.07
  • Accepted : 2019.06.28
  • Published : 2019.06.30
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Abstract

The demands to improve the performance of the vanadium redox flow battery have attracted an intense research on modifying the carbon-based electrode. In this study, the surface of graphite felt was reformed, using cobalt oxide. The cobalt oxide was implanted into graphite felt during hydrothermal and two step heat treatments. The cobalt was deposited by hydrothermal method and the two step heat treatments made lots of holes on the graphite felt surface which is called as porous surface. The porous surface acts as an electrochemically active site for the cathodic reaction of vanadium redox flow battery. The reformed electrode shows the electrochemically improved performance compared with the pristine electrode.

Keywords

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Fig. 1. SEM images of (a) Pristine GF, (b) Hydrothermal GF, (c) Heat GF, (d) H2 GF

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Fig. 2. SEM image of (a) H2 GF. EDS images show surface elements of H2 GF (b) C, (c) O, (d) Co

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Fig. 3. XRD patterns of each GF (a) Hydrothermal GF CoO3, Heat GF Co3O4, H2 GF α-Co. XRD reference data (b) CoO3 (ICSD : 98-009-3854), Co3O4 (ICSD : 98-006-9375), α-Co (ICSD : 98-005-3805)

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Fig. 4. Cyclic voltammograms of each GF for V (IV)/V (V) redox couple in 0.1 M V (IV) + 3 M H2SO4 electrolyte (a) H2 GF treated at various temperature, (b) H2 GF treated at various time, (c) Pristine GF, Hydrothermal GF, Heat GF, H2 GF, (d) Various scan rates of Pristine GF, (e) Various scan rates of H2 GF, (f) Peak current density vs square root scan rate of Pristine GF and H2 GF

Table 1. Electrochemical performance of GF for V (IV)/V (V) redox couple in 0.1 M V (IV) + 3 M H2SO4 electrolyte

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