Methanesulfonic acid-based electrode-decoupled vanadium–cerium redox flow battery exhibits significantly improved capacity and cycle life
Journal Article
·
· Sustainable Energy & Fuels
- Center for Solar Energy and Energy Storage; Department of Energy, Environmental and Chemical Engineering; Washington University in St. Louis; St. Louis; USA; DOE/OSTI
- Center for Solar Energy and Energy Storage; Department of Energy, Environmental and Chemical Engineering; Washington University in St. Louis; St. Louis; USA
An electrode-decoupled V–Ce redox flow battery (ED-RFB) was developed with 40% greater theoretical volumetric capacity and a 30% enhancement in practical volumetric capacity was demonstrated. The use of methanesulfonic acid supported V and Ce electrolytes and a highly permselective polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene (SEBS) triblock copolymer anion exchange separator enabled a >95% reduction in capacity fade compared to standard H2SO4 supported V–Ce ED-RFBs. The methanesulfonic acid supported V and Ce electrolytes was examined using the Marcus–Hush kinetic formulation and the presence of strongly solvated cations was shown to reduce capacity fade by cation cross-over. The ED-RFB maintained nearly 100% coulombic efficiency (CE) and ca. 70% energy efficiency (EE) (at a 50 mA cm2 galvanostatic charge/discharge current) over 100 cycles. The EE ranged from 85% at 25 mA cm-2 to 50% at 100 mA cm-2. The separator was highly acid stable with no changes in its FT-IR spectra and ionic conductivity before and after cycling. Thus, a V–Ce ED-RFB with long life, excellent rate capability and stability is demonstrated. The use of CH3SO3H, a “green” chemical with low toxicity and easy effluent treatment, facilitates scale-up and grid-scale deployment.
- Research Organization:
- Washington Univ., St. Louis, MO (United States)
- Sponsoring Organization:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E)
- DOE Contract Number:
- AR0000768
- OSTI ID:
- 1613713
- Journal Information:
- Sustainable Energy & Fuels, Journal Name: Sustainable Energy & Fuels Journal Issue: 9 Vol. 3; ISSN SEFUA7; ISSN 2398-4902
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
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