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An electrochemical characteristic evaluation of the Ti-Mn electrolyte system in sulfuric acid aqueous solution was conducted in different acid concentrations with and without the mixing of TiOSO 4  and MnSO 4  electrolyte system for a redox flow battery application. The reaction mechanism of Mn in sulfuric acid electrolyte was studied using the cyclic voltammetry and anodic voltage hold techniques. The overall anodic behavior of the Mn system can be described by the oxidation reaction of Mn 2+  to MnO 2  where Mn 3+  is an intermediate species. As the acid concentration increases, less MnO 2  is formed on the working electrode and more Mn 3+  is formed in the solution; however, due to the instability of Mn 3+  in an aqueous solution, Mn 3+  undergoes a hydrolysis reaction to precipitate as MnOOH in the electrolyte solution. The addition of 1 M TiOSO 4  to the Mn electrolyte is suggested to lower the H +  concentration which increases the amount of MnOOH in the solution and lowers the concentration of the aqueous Mn 3+  species. The MnOOH formed by the Mn 3+  hydrolysis reaction is found to be electrochemically active if it is deposited on the working electrode.

Characterization of the Electrochemical Behavior of MnSO4 with and without TiOSO4 in H2SO4 Solution

Characterization of the Electrochemical Behavior of MnSO₄ with and without TiOSO₄ in H₂SO₄ Solution