Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 131, Issue 1-2, Pages 547-553Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2011.10.022
Keywords
Carbon felt; Electrochemistry; Redox flow batteries; Surface modification
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Funding
- Ministry of Knowledge Economy, Republic of Korea [2009201010007C]
- Korea Evaluation Institute of Industrial Technology (KEIT) [2009201010007C] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The surface of carbon felt electrodes has been modified for improving energy efficiency of vanadium redox flow batteries. For comparative purposes, the effects of various surface modifications such as mild oxidation, plasma treatment, and gamma-ray irradiation on the electrochemical properties of carbon felt electrodes were investigated at optimized conditions. The cell energy efficiency was improved from 68 to 75% after the mild oxidation of the carbon felt at 500 degrees C for 5 h. This efficiency improvement could be attributed to the increased surface area of the carbon felt electrode and the formation of functional groups on its surface as a result of the modification. On the basis of various structural and electrochemical characterizations, a relationship between the surface nature and electrochemical activity of the carbon felt electrodes is discussed. (C) 2011 Elsevier B.V. All rights reserved.
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