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http://dx.doi.org/10.7316/KHNES.2021.32.4.256

Development of Activated Graphite Felt Electrode Using Ozone and Ammonia Consecutive Post Treatments for Vanadium Redox Flow Batteries  

CHOI, HANSOL (Department of Chemical and Biomolecular Engineering, Yonsei University)
KIM, HANSUNG (Department of Chemical and Biomolecular Engineering, Yonsei University)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.32, no.4, 2021 , pp. 256-262 More about this Journal
Abstract
A carbon felt electrode was prepared using ozone and ammonia sequential treatment and applied as an electrode for a vanadium redox flow battery (VRFB). The physical and electrochemical analyses demonstrate that the oxygen groups facilitate nitrogen doping in the carbon felt. Carbon felt (J5O3+NH3), which was subjected to ammonia heat treatment after ozone treatment, showed higher oxygen and nitrogen contents than carbon felt (J5NH3+O3), which was subjected to ammonia heat treatment first and then ozone treatment. From the charging/discharging of VRFB, the J5O3+NH3 carbon felt electrode showed 14.4 Ah/L discharge capacity at a current density of 150 mA /cm2, which was 15% and 33% higher than that of J5NH3+O3 and non-activated carbon felt (J5), respectively. These results show that ozone and ammonia sequential treatment is an effective carbon felt activation method to increase the performance of the vanadium redox flow battery.
Keywords
Vanadium redox flow battery; Ozone; Ammonia; Consecutive post treatments; Activation of carbon felt;
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