Development of economical and highly efficient electrolyte using vanadium pentoxide for vanadium redox flow battery
2022
Beriwal, Nishant | Varmā, Anila
Vanadium pentoxide can be an inexpensive replacement to vanadium sulfate in synthesizing vanadium redox flow battery (VRFB) electrolytes. In this study, VRFB electrolyte is synthesized from vanadium pentoxide using an indigenously developed process and setup. In order to have the same performance as that of vanadium sulfate, the supporting electrolyte environment constituted by H⁺ and sulfate ion is replicated based on the calculations from standard synthesis mechanisms. The calculations reveal that 4 M H₂SO₄ is required while preparing 1.5 M Vⁿ⁺ electrolyte from V₂O₅ to replicate 1.5 M Vⁿ⁺ in 2.5 M H₂SO₄ from VOSO₄. The effect of variation of sulfuric acid concentration is explored using thermal stability testing, which shows stable V(V) electrolytes for more than 30 days for 4 M H₂SO₄ concentration. Furthermore, the electrochemical performance of developed electrolyte from vanadium pentoxide shows similar charge–discharge profile, yet 1/5 the cost as compared to vanadium sulfate.
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