A review on the electrical properties of doped SrTiO₃ as anode materials for solid oxide fuel cells

To obtain a solid oxide fuel cell anode material with good performance, the researchers improved the conductivity and catalytic activity of the material by doping pure SrTiO₃. In this paper, the research progress of A-doped, B-doped and (A, B)-co-doped SrTiO₃ anode materials was reviewed. The effects of doping on the SrTiO₃ anode material were analyzed for different doping types, elements and concentration, atmospheric conditions, temperature and defect type. The common doping elements in the A site were La and Y, and the total conductivity of the material was improved by A-site doping. The common doping elements in the B site were Fe and Nb which improved the ionic and total conductivities of the material via B-site doping, respectively. The (A, B)-co-doped SrTiO₃ material had high catalytic activity, good stability, proper porosity and superior chemical compatibility and thermal expansion with solid electrolytes. The (A, B)-co-doped SrTiO₃ material also had strong mixed electronic-ionic conductivity which improved the electrical properties of the material.