Abstract
A new consecutive post-treatment for activating graphite felt electrodes is developed for use in vanadium redox flow batteries (VRFBs). Graphite felt is treated by thermal oxidation under air followed by thermal annealing with melamine as the nitrogen source. The physical and electrochemical analyses demonstrate that the oxygen-containing groups facilitates nitrogen doping in the carbon framework. A higher nitrogen content and pyridinic-N are observed when nitrogen is doped on the oxidized graphite surface using melamine compared to the content of pristine graphite felt. As a result, the treated graphite felt (GFO+N) exhibits outstanding electrochemical performance in VRFBs. It exhibits a 203% and 31% increased discharge capacity at a current density of 150 mA cm-2 comparted to pristine graphite felt and oxidized graphite felt, respectively. The improved performance is ascribed to the high nitrogen content and active nitrogen groups generated on the graphite felt, which improve the fast electrochemical kinetics of the vanadium redox reaction.
| Original language | English |
|---|---|
| Pages (from-to) | A2586-A2591 |
| Journal | Journal of the Electrochemical Society |
| Volume | 163 |
| Issue number | 13 |
| DOIs | |
| Publication status | Published - 2016 Jan 1 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Materials Chemistry
- Electrochemistry
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Synthesis of activated graphite felt using consecutive post-treatments for vanadium redox flow batteries. / Lee, Hyo June; Kil, Donghyun; Kim, Hansung.
In: Journal of the Electrochemical Society, Vol. 163, No. 13, 01.01.2016, p. A2586-A2591.Research output: Contribution to journal › Article
TY - JOUR
T1 - Synthesis of activated graphite felt using consecutive post-treatments for vanadium redox flow batteries
AU - Lee, Hyo June
AU - Kil, Donghyun
AU - Kim, Hansung
PY - 2016/1/1
Y1 - 2016/1/1
N2 - A new consecutive post-treatment for activating graphite felt electrodes is developed for use in vanadium redox flow batteries (VRFBs). Graphite felt is treated by thermal oxidation under air followed by thermal annealing with melamine as the nitrogen source. The physical and electrochemical analyses demonstrate that the oxygen-containing groups facilitates nitrogen doping in the carbon framework. A higher nitrogen content and pyridinic-N are observed when nitrogen is doped on the oxidized graphite surface using melamine compared to the content of pristine graphite felt. As a result, the treated graphite felt (GFO+N) exhibits outstanding electrochemical performance in VRFBs. It exhibits a 203% and 31% increased discharge capacity at a current density of 150 mA cm-2 comparted to pristine graphite felt and oxidized graphite felt, respectively. The improved performance is ascribed to the high nitrogen content and active nitrogen groups generated on the graphite felt, which improve the fast electrochemical kinetics of the vanadium redox reaction.
AB - A new consecutive post-treatment for activating graphite felt electrodes is developed for use in vanadium redox flow batteries (VRFBs). Graphite felt is treated by thermal oxidation under air followed by thermal annealing with melamine as the nitrogen source. The physical and electrochemical analyses demonstrate that the oxygen-containing groups facilitates nitrogen doping in the carbon framework. A higher nitrogen content and pyridinic-N are observed when nitrogen is doped on the oxidized graphite surface using melamine compared to the content of pristine graphite felt. As a result, the treated graphite felt (GFO+N) exhibits outstanding electrochemical performance in VRFBs. It exhibits a 203% and 31% increased discharge capacity at a current density of 150 mA cm-2 comparted to pristine graphite felt and oxidized graphite felt, respectively. The improved performance is ascribed to the high nitrogen content and active nitrogen groups generated on the graphite felt, which improve the fast electrochemical kinetics of the vanadium redox reaction.
UR - http://www.scopus.com/inward/record.url?scp=84992188033&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84992188033&partnerID=8YFLogxK
U2 - 10.1149/2.0531613jes
DO - 10.1149/2.0531613jes
M3 - Article
AN - SCOPUS:84992188033
VL - 163
SP - A2586-A2591
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
SN - 0013-4651
IS - 13
ER -