Doped (Nd,Ba)FeO3 oxides as potential electrodes for symmetrically designed protonic ceramic electrochemical cells

• Published in: Journal of solid state electrochemistry Vol. 24; no. 7; pp. 1453 - 1462
• Main Authors: Tarutina, Liana R., Lyagaeva, Julia G., Farlenkov, Andrei S., Vylkov, Alexey I., Vdovin, Gennady K., Murashkina, Anna A., Demin, Anatoly K., Medvedev, Dmitry A.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.07.2020; Springer Nature B.V
• Subjects: Analytical Chemistry; Barium; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Configurations; Copper; Electrical properties; Electrochemical cells; Electrochemistry; Electrode materials; Electrode polarization; Electrodes; Electrolysis; Electrolytes; Electrolytic cells; Energy Storage; Functional materials; Nickel; Original Paper; Oxidation; Physical Chemistry; Protons; Sediments; Stoichiometry; System effectiveness; Thermal expansion; Thermomechanical properties; Symmetrical electrodes; Perovskite; BaCeO; SOFCs & SOECs; Proton-conducting materials; BaZrO
• ISSN: 1432-8488; 1433-0768
• DOI: 10.1007/s10008-020-04522-4

The design of new electrode materials with high redox stability has great potential for the fabrication of solid oxide fuel and electrolysis cells having a symmetrical configuration; such a configuration is particularly promising in terms of economic and technological factors due to involving a reduced number of functional materials and technological steps. Under the framework of the present study, we developed new Nd 1– x Ba x Fe 0.9 M 0.1 O 3– δ materials (where M  = Cu or Ni, x  = 0.4 or 0.6), characterizing their functional properties (oxygen non-stoichiometry, thermomechanical and electrical properties) under both oxidizing and reducing conditions, as well as demonstrating the principal capability of their application as symmetrical electrodes in proton-conducting electrochemical cells. The obtained results demonstrate the desirability of a low barium content due to decreased thermal expansion coefficients and chemical strain contribution and Cu-doping due to the formation of an electrochemically active scaffold having nano-sized sediments. The Nd 0.6 Ba 0.4 Fe 0.9 Cu 0.1 O 3– δ electrodes fabricated onto the BaCe 0.5 Zr 0.3 Y 0.1 Yb 0.1 O 3– δ proton-conducting electrolytes exhibit polarization resistances of 1.1 and 15.1 Ω cm 2 at 600 °C in wet air and wet hydrogen measuring atmospheres, respectively. These reported results are among the first concerning the effective operation of symmetrical electrodes in systems with proton-conducting electrolytes. Graphical abstract