Transport properties of Ca-doped Ln2NiO4 for intermediate temperature solid oxide fuel cells cathodes and catalytic membranes for hydrogen production

Vladislav A. Sadykov, Elena Yu Pikalova, Alexander A. Kolchugin, Andrey V. Fetisov, Ekaterina M. Sadovskaya, Elena A. Filonova, Nikita F. Eremeev, Vladimir B. Goncharov, Alexey V. Krasnov, Pavel I. Skriabin, Alexander N. Shmakov, Zakhar S. Vinokurov, Arcady V. Ishchenko, Sergey M. Pikalov

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Novel methods were applied in this work to elucidate the structure evolution of Ln2-xCaxNiO4+δ oxides (Ln = La, Pr, Nd; x = 0, 0.3) and study their oxygen mobility. Relationship between cations state, structural, electrical, electrochemical and kinetic properties was revealed. In all doped materials the overall oxygen mobility characterized by Do declined by more than an order of magnitude due to decreasing the interstitial oxygen content and hampering cooperative mechanism of oxygen migration. For La nikelate additional slow diffusion channel appears with DO 5.4·10−14 cm2/s at 700 K. Correlation of electrochemical and oxygen transport properties was demonstrated. A high electrical conductivity (up to 120 S/cm at 700 K) in Ln1.7Ca0.3NiO4+δ (Ln = Pr, Nd) along with satisfactory oxygen mobility and electrochemical properties makes these materials promising for a wide row of electrochemical applications.

Original languageEnglish
Pages (from-to)13625-13642
Number of pages18
JournalInternational Journal of Hydrogen Energy
Volume45
Issue number25
DOIs
Publication statusPublished - 7 May 2020

Keywords

  • Doped LnNiO
  • Electrochemical performance
  • Hydrogen production
  • Isotope exchange
  • MIEC membrane
  • SOFC cathode
  • ELECTROCHEMICAL PROPERTIES
  • SURFACE EXCHANGE
  • ION CONDUCTORS
  • LA2NIO4+DELTA
  • COMPOSITE CATHODE
  • PERFORMANCE
  • SOFC CATHODES
  • CRYSTAL-CHEMISTRY
  • LATTICE STRUCTURE
  • OXYGEN DIFFUSION
  • Doped Ln(2)NiO(4+delta)

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