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Stability of highly supersaturated vanadium electrolyte solution and characterization of precipitated phases for Vanadium Redox Flow Battery

Carvalho, Waldemir Moura and Cassayre, Laurent and Quaranta, Delphine and Chauvet, Fabien and El Hage, Ranine and Tzedakis, Théo and Biscans, Béatrice Stability of highly supersaturated vanadium electrolyte solution and characterization of precipitated phases for Vanadium Redox Flow Battery. (2021) Journal of Energy Chemisty, 61. 436-445. ISSN 2095-4956

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Official URL: https://doi.org/10.1016/j.jechem.2021.01.040

Abstract

The vanadium redox flow battery (VRFB) has been receiving great attention in recent years as one of the most viable energy storage technologies for large-scale applications. However, higher concentrations of vanadium species are required in the H2O-H2SO4 electrolyte in order to improve the VRFB energy density. This might lead to unwanted precipitation of vanadium compounds, whose nature has not been accurately characterized yet. For this purpose, this study reports the preparation of V(II), V(III), V(IV) and V(V) supersaturated solutions in a 5 M H2SO4-H2O electrolyte by an electrolytic method, from the only vanadium sulfate compound commercially available (VOSO4). The precipitates obtained by ageing of the stirred solutions are representative of the solids that may form in a VRFB operated with such supersaturated solutions. The solid phases are identified using thermogravimetric analysis, X-ray diffraction and SEM. We report that dissolved V(II), V(III) and V(IV) species precipitate as crystals of VSO4, V2(SO4)3 and VOSO4 hydrates and not in their anhydrous form; conversely V(V) precipitates as an amorphous V2O5 oxide partially hydrated. The measured hydration degrees (respectively 1.5, 9, 3 and 0.26 mol of H2O per mol of compound) might significantly affect the overall engineering of VRFB operating with high vanadium concentrations.

Item Type:Article
HAL Id:hal-03235858
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:02 Apr 2021 10:13

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