Electrochemical characterization of Pr 2CuO 4 cathode for IT-SOFC

N. V. Lyskov, M. S. Kaluzhskikh, L. S. Leonova, G. N. Mazo, S. Ya Istomin, E. V. Antipov

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41 Citations (Scopus)

Abstract

The electrochemical properties of Pr 2CuO 4 (PCO) electrode screen-printed on Ce 0.9Gd 0.1O 1.95 (CGO) electrolyte were investigated. PCO was synthesized by a solid-state route from the stoichiometric mixture of oxides at 1273 K, 20 h. Thermogravimetric analysis (TGA) of PCO both in air and Ar demonstrated its stability up to 1173 K. X-ray powder diffraction study of the PCO-CGO mixture annealed in air at 1173 K for 100 h did not reveal chemical interaction between materials. The oxygen reduction on porous PCO electrodes applied on CGO electrolyte was studied in a symmetrical cell configuration by AC impedance spectroscopy at OCV conditions at 773-1173 K and pO 2 = 10 -4-1 atm. Analysis of the data revealed that depending on temperature and oxygen partial pressure different rate-determining steps of the overall oxygen reduction reaction take place. Calculated value of area specific resistance (ASR) of PCO electrode is 1.7 ± 0.2 Ω cm 2 at 973 K in air and it is constant after 6 subsequent thermocycles. We have found that oxygen reduction on PCO applied on CGO takes mainly place at the triple-phase boundary (TPB) since Adler-Lane-Steele (ALS) model is not valid. Therefore electrochemical characteristics of PCO electrode can be improved by further optimization of both microstructure of the electrode and electrode/electrolyte interface and PCO can be considered as a promising cathode material for intermediate temperature solid oxide fuel cells (IT-SOFC).

Original languageEnglish
Pages (from-to)18357-18364
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume37
Issue number23
DOIs
Publication statusPublished - Dec 2012
Externally publishedYes

Keywords

  • Cathode material
  • Electrode-electrolyte interface
  • Impedance spectroscopy
  • Porous electrode
  • Praseodymium cuprate
  • SOFC

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