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