Cobalt‐free perovskite SrTa 0.1 Mo 0.1 Fe 0.8 O 3‐ δ as cathode for intermediate‐temperature solid oxide fuel cells

Summary Ta 5+ and Mo 6+ substituted SrFeO 3‐ δ perovskites were researched as cathodes of intermediate‐temperature solid oxide fuel cells (IT‐SOFCs). The samples were synthesized with three components, e.g. mono‐doped SrTa 0.2 Fe 0.8 O 3‐ δ , SrMo 0.2 Fe 0.8 O 3‐ δ and co‐doped SrTa 0.1 Mo 0.1 Fe 0.8 O 3‐ δ . Their phase structure, thermal stability, electrical conductivity and electrochemical catalytic property were researched comparatively. Ta 5+ and Mo 6+ co‐doped SrTa 0.1 Mo 0.1 Fe 0.8 O 3‐ δ possesses better electrochemical catalytic activity than that of the mono‐doped SrFeO 3‐ δ . The performance difference between the mono‐doped and co‐doped SrFeO 3‐ δ has a close relation with the different contents of oxygen vacancy in the materials. The synergistic effect derived from Ta 5+ and Mo 6+ co‐doping enhances the amount of oxygen vacancies in material, thus resulting in its better electrochemical property. The cells with SrTa 0.1 Mo 0.1 Fe 0.8 O 3‐ δ as cathode deliver a R p of 0.085 Ω·cm 2 and an output of 931 mW·cm ‐2 at 800 °C.