Photometrical Determination of the State-of-Charge in Vanadium Redox Flow Batteries Part I: In Combination with Potentiometric Titration

Abstract

The stepwise oxidation of vanadium ions in electrolytes, as used in all vanadium redox flow batteries (VRFB), is studied offline by a combination of potentiometric titration and simultaneous UV/Vis/NIR spectroscopy. Eight different total vanadium concentrations between 0.2 mol L -1 and 1.6 mol L -1 have been investigated. The analyte (titrand, V 2+ solution) is the anolyte (V 2+ /V 3+ side) of a fully charged laboratory vanadium redox flow battery (VRFB). Absorption maxima are observed at λ = 850 nm for V 2+ and at λ = 400 nm for V 3+ , the corresponding absorption coefficients are determined. In the former case an extrapolation procedure is necessary because during transfer from the VRFB to the titration cell, oxidation to V 3+ by ambient oxygen cannot completely be avoided. Based on the knowledge of the absorption coefficients, via simultaneous photometry of V 2+ and V 3+ , the state-of-charge of the anolyte of a VRFB can be determined. In the catholyte (V 4+ /V 5+ side) of a VRFB the formation of an intermediate mixed valence V IV -V V complex at large vanadium concentration prevents a simple photometric SOC determination.