Effect of voltage and temperature on NO removal with power generation in SOFC with V2O5-added LSCF-GDC cathode

A solid oxide fuel cell (SOFC) unit, operating at 800–875 °C, is constructed with Ni-(Ce,Gd)O2−x (GDC) as the anode, yttria-stabilized zirconia as the electrolyte, and V2O5-added (LaSr)(CoFe)O3-GDC as the cathode. Both the current–voltage measurement and the fixed-voltage test were performed on electrochemical NO reduction, i.e. DeNOx, with power generation. As the voltage decreases, the NO conversion increases but only slightly. DeNOx by SOFC is operational with the O2 concentration of 2–5% and temperature of 800–875 °C. The NO conversion increases with decreasing O2 and NO concentrations but with increasing temperature. This process of DeNOx by SOFC should be suitable for NO removal from the exhaust of lean burn engines.