Modeling Analysis of Gas Reverse Strategy between Symmetric Solid Oxide Fuel Cell Electrodes

Abstract

Symmetric solid oxide fuel cell (SSOFC) uses the same material as anode and cathode. The problem of electrode carbon deposition and sulfur poisoning can also be alleviated by the gas exchange between the anode and the cathode. The method of gas purging, switching to new gas species, and controlling the molar fraction of fuel and O2 is the main content of this study. In this study, the SSOFC model was established using the finite element method and corrected using experimental data. Through the simulation method, the gas composition and the pressure of the electrode inlet and outlet are changed. The control strategy of SSOFC cathode and anode gas exchange is given. In this paper, the transient process of electrical response and gas concentration change during the gas exchange operation is analyzed to reduce the operation time.