Non-aqueous manganese acetylacetonate electrolyte for redox flow batteries
Abstract
A single-metal redox flow battery employing manganese(III) acetylacetonate in tetraethylammonium tetrafluoroborate and acetonitrile has been investigated. Cyclic voltammetry was used to evaluate electrode kinetics and reaction thermodynamics. The Mn II/Mn III and Mn III/Mn IV redox couples appeared to be quasi-reversible. A cell potential of 1.1 V was measured for the one-electron disproportionation of the neutral Mn III complex. The diffusion coefficient for manganese acetylacetonate in the supporting electrolyte solution was estimated to be in the range of 3-5 × 10 -6 cm 2 s -1 at room temperature. The charge-discharge characteristics of this system were evaluated in an H-type glass cell. Coulombic efficiencies increased with cycling suggesting an irreversible side reaction. Energy efficiencies for this unoptimized system were ∼21%, likely due to the high cell-component overpotentials.
- Publication:
-
Journal of Power Sources
- Pub Date:
- 2011
- DOI:
- 10.1016/j.jpowsour.2011.02.020
- Bibcode:
- 2011JPS...196.5742S
- Keywords:
-
- Manganese acetylacetonate;
- Single-metal redox flow battery;
- Non-aqueous electrolyte;
- Organic;
- Energy-storage