| 초록 |
The current contribution deals with the understanding of the performance fade of VRFB during initial cycling. However, the performance fade mechanism has not been fully unveiled partly due to the lack of the in-situ monitoring of each polarization components during cycling under real operation. In this work, for the first time, we report how ohmic resistance and charge transfer resistances of positive and negative electrode change with few hundred cycles by using impedance spectroscopic technique with dynamic hydrogen electrode as a reference electrode and postmortem analysis. We found that the conductivity loss of carbon felt electrode due to the surface oxidation significantly is responsible for the increased ohmic and charge transfer resistances during the cycling. We believe that the contribution provides an important insight on electrode material design and can motivate further research on electrode stability against strong acidic environment. |
