ABSTRACT
Three physical properties of the supersaturated vanadium (II) and vanadium (III) sulphate solutions were investigated in this study: density, viscosity and conductivity. These solutions correspond to the charged and discharged negative half-cell electrolytes, respectively, of the vanadium redox ow battery (VRFB) and the vanadium/oxygen redox fuel cell. The effects of vanadium concentration, total sulphates concentration and temperature on these properties were determined. The measured values of each of the physical properties (density, viscosity and conductivity) were tted to an empirical formula that describes the property as a function of vanadium (III) sulphate concentration, sulphuric acid concentration and temperature. The three properties showed good agreement between the measured and calculated values, indicating successful tting. These empirical models will provide an important tool for use in the engineering design of vanadium ow battery systems for different applications and climatic conditions.
