Oxygen Dissociation and Interfacial Transfer Rate on Performance of SOFCs with Metal‐Added (LaSr)(CoFe)O 3 ‐(Ce,Gd)O 2 – δ Cathodes

A solid oxide fuel cell (SOFC) unit is constructed with Ni‐Ce 0.9 Gd 0.1 O 2 – δ (GDC) as the anode, yttria‐stabilised zirconia (YSZ) as the electrolyte and Pt, Ag or Cu‐added La 0.58 Sr 0.4 Co 0.2 Fe 0.8 O 3 – 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 O 2 dissociation reactivity but results in an interfacial resistance for O transfer. A balance between the rates of O 2 dissociation and interfacial O transfer is needed for best SOFC performance.