A variable temperature study of the transport properties of aqueous solutions of VOSO4 and NH4VO3 in 2 M H2SO4

作者：Suarez Sophia^*; Sahin Meriam; Adam Yara; Moussignac Lucy; Cuffari David; Paterno Domenec

来源：Journal of Power Sources, 2015, 276: 153-161.

DOI：10.1016/j.jpowsour.2014.11.101

• Vanadium redox flow battery
• Vanadyl sulfate
• Metavanadate

Variable temperature ionic conductivity, viscosity and H-1 NMR spin-lattice relaxation times, linewidths and chemical shifts measurements were determined for various concentrations of aqueous ammonium metavanadate (NH4VO3) and vanadyl sulfate (VOSO4) over the temperature range of 20-100 degrees C. Concentration ranges of 0.05-2 M and 0.05-0.2 M were investigated for VOSO4 and NH4VO3 respectively in 2 M H2SO4. Results show ion and proton transport processes that are mediated strongly by increasing solution viscosity, especially in the case of VOSO4. Activation energies calculated from ionic conductivity and solution viscosity show greater energy being needed for translational ion dynamics with increasing concentration for both solutions. Additionally, data suggest that with greater metal ion concentration ion association is more prevalent for the vanadyl ion. The differences between the transport capabilities of the two solution are discussed in terms of the H-1 NMR, ionic conductivity and viscosity data.

• 出版日期2015-2-15