ИСТИНА

LiBrO3 is a prospective oxidizer for redox flow batteries possessing an extremely high energy density. At a sufficiently high concentration of protons very high current densities take place in the system, up to the realization of the diffusion-limited current conditions for bromate. The solution acidity plays a crucial role for this process, both to ensure a sufficiently high rate of the comproportionation reaction of BrO3- with Br- and because of the proton consumption by this reaction. At the same time the acidity of the solution is limited by the BrO3- decomposition at very low pH. In this context we have analyzed numerically this process for the bulk solution composition where the H+ concentration is much lower than the BrO3- one. We present results of the numerical integration of diffusion transport equations for RDE with the use of the Nernst layer model under the condition of the bromate excess.