Abstract
Segmented cells enable real time visualization of the flow distribution in vanadium redox flow batteries by local current or voltage mapping. The lateral flow of current within thick porous electrodes, however, impairs the local resolution of the detected signals. In this study, the open circuit voltage immediately after the cessation of charge/discharge is used for the mapping of reactant conversion. This quantity is not hampered by lateral flow of current and can be conveniently transformed to the corresponding state of charge. The difference between theoretically calculated and experimentally determined conversion (change in the state of charge) across the electrode is used to determine local variations in conversion efficiency. The method is validated by systematic experiments using electrodes with different modifications, varying current densities and flow configurations. The procedure and the interpretation are simple and scalable to any size of flow cell.
| Original language | English |
|---|---|
| Article number | 2 |
| Journal | Batteries |
| Volume | 5 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Mar 2019 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2019 by the authors. Licensee MDPI, Basel, Switzerland.
ASJC Scopus Subject Areas
- Energy Engineering and Power Technology
- Electrochemistry
- Electrical and Electronic Engineering
Keywords
- Current distribution
- Open circuit voltage
- Redox flow batteries
- Segmented cell
- Voltage distribution