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A solid oxide fuel cell (SOFC) unit is constructed with Ni‐Ce0.9Gd0.1O2 – δ (GDC) as the anode, yttria‐stabilised zirconia (YSZ) as the electrolyte and Pt, Ag or Cu‐added La0.58Sr0.4Co0.2Fe0.8O3 – δ (LSCF)–GDC as the cathode. The current–voltage measurements are performed at 800 °C. Cu addition leads to best SOFC performance. LSCF–GDC–Cu is better than LSCF–GDC and much better than GDC as the material of the cathode interlayer. Cu content of 2 wt.‐% leads to best SOFC performance. A cathode functional layer calcined at 800 °C is better than that calcined at higher temperature. Metal addition increases the O2 dissociation reactivity but results in an interfacial resistance for O transfer. A balance between the rates of O2 dissociation and interfacial O transfer is needed for best SOFC performance.

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A process for nitric oxides ͑NO x , NO plus NO 2 ͒ removal by solid oxide fuel cells ͑SOFCs͒ can easily reduce NO x in the flue gases to zero and also generate an electrical current. An yttria-stabilized zirconia electrolyte-supported SOFC unit cell was constructed with Ni-gadolinia-doped ceria ͑GDC͒ as the anode and Cu-added La 0.58 Sr 0.4 Co 0.2 Fe 0.8 O 3−␦ -GDC composite as the cathode. DeNO x tests were carried out at a fixed voltage of 0.55 V and 800°C. As the inlet NO x concentration decreases, the NO x conversion increases. The generated current density increases with increasing NO concentration from 150 to 5000 ppm. Increasing O 2 concentration from 4 to 8% increases the NO conversion due to increased current density, which increases the oxygen transfer rate. Adding CO 2 can increase the NO conversion, and also due to increased current density. As the O 2 concentration increases from 2 to 8% and the CO 2 concentration increases from 5 to 15%, the generated current density increases. Adding H 2 O can decrease both the current density and the NO conversion.