Synthesis of activated graphite felts using short-term ozone/heat treatment for vanadium redox flow batteries

Donghyun Kil, Hyo June Lee, Sangki Park, Sangkyun Kim, Hansung Kim

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A new combined method of ozone exposure and thermal treatment is developed as a method of activating graphite felt electrodes for use in vanadium redox flow batteries (VRFB). The physical and electrochemical properties of ozone/heat-treated graphite felt was compared with the conventional air/heat treated graphite felts. The results demonstrated that the ozone/heat-treated graphite felt had higher specific surface area and oxygen content compared with the conventional air/heat-treated graphite felts. The ozone/heat treatment method is also very selective in the formation of carboxylic group which is active toward vanadium redox reaction. The performance improvement of the ozone/heat treated graphite felt was significant. It is notable that the ozone/heat treatment was performed at a temperature as low as 180°C for just 6 min. This temperature is a considerably milder condition compared with the conventional air/heat treatment process that requires long treatment time (5 hours) and high temperature of 500°C. This property indicates that the ozone/heat treatment is a cost-effective and practical method for activating graphite felt that is used in VRFB.

Original languageEnglish
Pages (from-to)A3011-A3017
JournalJournal of the Electrochemical Society
Volume164
Issue number13
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

Felts
Vanadium
Graphite
Ozone
Heat treatment
Air
Redox reactions
Flow batteries
Electrochemical properties
Specific surface area
Temperature
Physical properties
Hot Temperature
Oxygen
Electrodes

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

Kil, Donghyun ; Lee, Hyo June ; Park, Sangki ; Kim, Sangkyun ; Kim, Hansung. / Synthesis of activated graphite felts using short-term ozone/heat treatment for vanadium redox flow batteries. In: Journal of the Electrochemical Society. 2017 ; Vol. 164, No. 13. pp. A3011-A3017.
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Synthesis of activated graphite felts using short-term ozone/heat treatment for vanadium redox flow batteries. / Kil, Donghyun; Lee, Hyo June; Park, Sangki; Kim, Sangkyun; Kim, Hansung.

In: Journal of the Electrochemical Society, Vol. 164, No. 13, 01.01.2017, p. A3011-A3017.

Research output: Contribution to journalArticle

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