Oxide cathodes for electrochemical devices made with the use of a nanostructured composition material

• Published in: Russian journal of electrochemistry 2012-10, Vol.48 (10), p.981-985
• Main Authors: Yaroslavtsev, I. Yu, Bronin, D. I., Vdovin, G. K., Isupova, L. A.
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Electrochemistry; Physical Chemistry
• ISSN: 1023-1935; 1608-3342
• DOI: 10.1134/S1023193512100138

The possibility of using the LnO x mischmetal (Ln = Ce, La, Nd, Pr, Sm) for preparation of cathodes for solid-oxide fuel cells with the supported YSZ electrolyte is studied. The electrical and electrochemical characteristics of Ln-Mn-O electrodes with the ratio of all lanthanides contained in the mischmetal except for cerium to manganese Ln: Mn = 1: 1 and also of a material comprised of Ln-Mn-O and La 0.8 Sr 0.2 MnO 3 are studied. The latter electrode material that contains 35–40 wt % of Ln-Mn-O and was sintered at 1200°C has the specific ohmic resistance of 0.1 Ω cm at 800°C. The polarization conductivity is compared for electrodes made of 100% Ln-Mn-O, 40 wt % Ln-Mn-O + 60 wt % La 0.8 Sr 0.2 MnO 3 , and 100% La 0.8 Sr 0.2 MnO 3 in the initial state and after their modification through the introduction of an electrocatalyst (PrO 2 − x ). The highest polarization conductivity is typical of Ln-Mn-O + (La, Sr)MnO 3 electrodes containing 40 wt % Ln-Mn-O and PrO 2 − x . The polarization conductivity of these electrodes is found to be 25 S/cm 2 at 800°C.