International Journal of Electrochemical Science · 2012 · 18 citations · 15 references
Natural SciencesChemical EngineeringChemistryElectrochemical EngineeringElectrochemistryEnergy MaterialsBattery SystemsElectrochemical CellsElectrochemical Energy StorageElectrode MaterialsElectrolyte SolutionsRedox-active MaterialsCharge-discharge CyclingElectrochemical CharacterizationElectrolyte AdditivesElectrolyte StabilityElectrolytesRedox Flow BatteriesThermal StabilityVoltammetry
To improve the stability of 2M V(V) in 3M H2SO4 electrolyte in charge-discharge cycles, Trishydroxymethyl aminomethane (Tris) was used as an additive of the electrolyte and first investigated in VRB applicaton. Thermal stability of the V(V) electrolyte at 40 °C was improved by 2-4% Tris additive. The cyclic voltammetry results of 2 M V(IV) in 3M H2SO4 electrolyte with various additive amounts showed the electrochemical activity of the electrolyte with 3% Tris additive was improved compared to blank electrolyte, and electrochemical impedance spectroscopy results indicated the electrolyte solution resistance (0.43 ohm) was less than blank sample (0.91 ohm). The VRB employing the vanadium solution with the Tris additive as positive electrolyte exhibited higher voltage efficiency and energy efficiency at the same current densities compared with the blank electrolyte system.
15