Oxygen ion transport and electrode properties of La(Sr)MnO3
Abstract Cathodic polarization of La x Sr y MnO 3 ( x = 0.3–0.6; y = 0.3–0.5) electrodes, doped by the sintering agents Bi 2 O 3 , PbO, Sb 2 O 3 , CuO, or Bi 2 CuO 4 , on a zirconia solid electrolyte has been studied. The electrochemical activity of La 0.6 Sr 0.4 MnO 3 electrodes with sintering agent Bi 2 CuO 4 was found to be the highest among the solid solutions based on La(Sr)MnO 3 . The positive effect of the bismuth cuprate addition is ascribed to the sufficiently high mixed ionic and electronic conductivity of Bi 2 CuO 4 . The obtained results are characterized by the absence of a direct correlation between the electrochemical parameters of the electrode layers and oxygen permeability of the manganite ceramics. It was found that oxygen transport through the manganite ceramics is limited by the sorption on ceramics surface.