Numerical simulation of gas diffusion effects on charge/discharge characteristics of a solid oxide redox flow battery

► Fundamental characteristics of a solid oxide redox flow battery were studied. ► A gas-diffusion based time-dependent 1-D numerical simulation was performed. ► Reasonable and consistent results were obtained for qualitative discussion. ► The two reaction compete, and their balance leads to a quasi-steady state. ► It was found that gas diffusion in the redox metal needs to be carefully designed.