Vanadium III Sulfate Solution

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vanadium iii sulfate is an inorganic compound with the formula V2(SO4)3. It is a yellow solid that is stable in dry air but upon exposure to moist air forms a green hydrate. Vanadium sulfate is used as an electrolyte in vanadium redox flow batteries.

The chemical structure of vanadium sulfate has been determined by powder X-ray diffraction and 17O and 35/37Cl nuclear magnetic resonance (NMR) spectroscopy. The electronic structure of vanadium sulfate was also studied by density functional theory (DFT) based computational modelling. The results of these experiments showed that the sulfate has a distorted tetrahedral structure.

One limitation of the vanadium redox battery is that it requires the use of high concentrations of vanadium(III) and vanadium(II). It is not possible to achieve these concentrations in air due to the easy oxidation of the vanadium(II) ions. In order to overcome this issue a method is proposed for the preparation of an aqueous vanadium(III) sulfate solution that can be used in the negative electrode of the battery.

The solution is prepared by adding vanadium(III) oxide to sulfuric acid with a concentration of > 80%, and heating it to 140–260 deg. C. The resulting aqueous solution of the vanadium(III) sulfate can be used as the negative electrode electrolyte in a vanadium redox battery. The sulfate has an excellent solubility in water, and does not form a precipitate even at high temperatures. The sulfate can be readily recovered from the reaction solution and can be stored at room temperature.