A STUDY OF THE Ti-Mn REDOX COUPLE FOR REDOX FLOW BATTERY BASED ON COMSOL

Abstract

In this study, the distribution of overpotential, dissociation rate, electrode potential, current density, and comparison of dissociation rate with Vanadium ion is proposed to examine for a Titanium Manganese Redox Flow Battery (TMRFB). TMRFB can be a solution in the current condition of energy scarcity and environmental pollution due to its high capacity and ecofriendly characteristics. Rather with the more expensive vanadium redox flow batteries, Mn-based flow batteries have gained appeal due to their inexpensive cost and high energy density. This study shows that the Ti⁴⁺/ Ti³⁺ and Mn³⁺/Mn²⁺ ions have higher dissociation rate at the membrane and lower at the inlet where the velocity of the electrolyte flow is higher; The membrane undergoes more oxidation-reduction reactions, therefore the electrolyte flow rate is crucial in the redox flow cell; Furthermore, our study finds that as electrode thickness is compressed, current density and electrode potential are enhanced while overpotential is lowered; comparison with vanadium redox battery it is found that Ti-Mn shows greater dissociation rate than Vanadium ions. The model's equations are solved by using the finite-element approach in COMSOL Multiphysics software. The reaction is modeled using an electrolyte-electrode interface connection. Dissociation rate shows that the oxidation-reduction reaction occurs with less potential at the membrane. Battery performance can be increased by optimizing the electrolyte flow rate. Electrode compression increases conductivity and battery performance.