| 초록 |
In this study, effects of nitrogen (N) and oxygen (O) atomic co-doping on carbon electrode are studied for vanadium redox flow battery (VRFB). There are two methods to prepare N and O co-doping carbon felt electrode. (i) Impregnation of urea or melamine on the pristine-GF and followed by reactions at high temperatures, (ii) Chemical vapor deposition of the pristine-GF with NH3-O2 reactants. The effects of the kinetic relevance of the N and O co-doping are investigated for the VO2+/VO2+ redox reactions. As the result, Pyrrolic-N and hydroxyl are the most kinetically relevant of the N and O functional groups for VO2+/VO2+ redox reaction. The N and O co-doping carbon electrode for a VRFB afforded 5–7% better initial voltage and energy efficiencies along with 1.4 times higher charge–discharge capacity than the conventional oxygen doped GF electrode owing to the lower reaction overpotential. |
