Analysis of the influence of high-entropy oxide optimized electrolyte on the electrochemical performance of iron chromium flow batteries

The electrochemical performance of iron chromium flow batteries was improved by optimizing the electrolyte with high-entropy oxides. The influence of high-entropy oxide content in the electrolyte on the electrochemical performance of iron chromium flow batteries was studied and analyzed. Due to the synergistic effect of conductivity and electrochemical activity, the flow batteries exhibit better electrochemical performance when the electrolyte doping amount is 1 wt%. When the current density is 160 mAcm-2, the capacity of the assembled flow battery after optimizing the electrolyte is 210 mAhL-1, and the capacity after 100 cycles is 187 mAhL-1. From the calculation of adsorption energy and Gibbs free energy, it can be seen that the adsorption free energy of CuMn2O4 for iron ions is -151.256 J/mol, which greatly promotes the rate of redox reaction in the iron chromium flow batteries. This work effectively improves the electrochemical performance of iron chromium flow batteries, and further provides theoretical guidance and data support for the application of high-entropy oxides in flow batteries.