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Vanadyl Sulfate Hydrate (VOSO4 · xH2O, >99.9%) as Electrolyte Salt for Vanadium Redox Flow Battery, 50-200 g/bottle, CVRFBESVOSO4

Vanadyl Sulfate Hydrate (VOSO4 · xH2O, >99.9%) as Electrolyte Salt for Vanadium Redox Flow Battery, 50-200 g/bottle, CVRFBESVOSO4

$149.00 USD
In Stock SKU: CVRFBESVOSO4W50
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Vanadyl Sulfate Hydrate (VOSO4 * H2O) is the standard high-purity precursor salt used to formulate the aqueous electrolyte in all-vanadium redox flow batteries (VRFBs). Dissolved in sulfuric or mixed-acid media, it provides the tetravalent vanadium (V^IV, VO^{2+}) needed to establish both the positive and negative active electrolytes.

A VRFB exploits four continuous oxidation states of vanadium, eliminating cross-contamination across the ion-exchange membrane (e.g., Nafion): 

Because commercial VOSO4 contains purely V^{IV}, starting a battery from this salt requires an initial electrochemical conditioning step to produce a balanced, symmetrical 50/50 system (V^{3.5+} average valence).

Part Number

CVRFBESVOSO4 (C-VRFB-ES-VOSO4)

CAS

123334-20-3

Appearance

Blue or green blue powder

Molar Mass 

163.00 g/mol (anhydrous basis)

Purity 

>99.9% (impurity<200 ppm)

Melt Point

~105 °C

Package Grade

50 g, 100 g, and 200 g/bottle


References

(1)M. Vijayakumar, et al., Nuclear magnetic resonance studies on vanadium(IV) electrolyte solutions for vanadium redox flow battery, J. Power Sources, 2010, 195, 7709-7717 

(2) J. Heiß, et al., Measurement and modeling of thermodynamic non-idealities in aqueous sulfuric acid solutions of vanadyl sulfate for redox flow batteries, Phys. Chem. Chem. Phys. (2026) 28 (34): 20783–20792.


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