High-temperature oxygen nonstoichiometry and electrical conductivity of layered Ln2–xSrxNiO4–δ (Ln – La, Pr, Nd; х = 1.0 –1.6) nickelates

Authors

  • Ekaterina S. Kravchenko Belarusian State University, Nezavisimosti avenue, 4, 220030, Minsk
  • Kiryl V. Zakharchuk CICECO – Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro
  • Vladimir V. Pankov Belarusian State University, Nezavisimosti avenue, 4, 220030, Minsk
  • Aleksey A. Yaremchenko CICECO – Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro

Keywords:

nickelate, solid oxide fuel cells, oxygen electrode, oxygen nonstoichiometry, electrical conductivity

Abstract

High-temperature oxygen nonstoichiometry and electrical conductivity of Ln2 – xSrxNiO4 – δ (Ln – La, Pr, Nd; х = 1.0–1.6) nickelates were evaluated for potential application as oxygen electrodes of solid oxide fuel cells. In air, all studied nickelates were found to maintain tetragonal K2NiF4-type structure up to 1000 °С and to demonstrate oxygen deficiency above 500 °С. Oxygen nonstoichiometry increases with temperature and with strontium content in A sublattice. Ln2 – xSrxNiO4 – δ nickelates possess p-type metallic-like electrical conductivity under oxidizing atmosphere at 500 –1000 °С. In each series, the highest conductivity (260–400 S ⋅ cm–1, depending on rare-earth element) was observed for the composition with x = 1.2. Neodymium-containing nickelates demonstrate highest concentration of oxygen vacancies in the studied composition range.

Author Biographies

  • Ekaterina S. Kravchenko, Belarusian State University, Nezavisimosti avenue, 4, 220030, Minsk

    postgraduate student at the department of physical chemistry, faculty of chemistry

  • Kiryl V. Zakharchuk, CICECO – Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro

    researcher at the department of materials and ceramic engineering

  • Vladimir V. Pankov, Belarusian State University, Nezavisimosti avenue, 4, 220030, Minsk

    doctor of science (chemistry), full professor; head of the department of physical chemistry, faculty of chemistry

  • Aleksey A. Yaremchenko, CICECO – Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro

    PhD (chemistry); principal researcher at the department of materials and ceramic engineering

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Published

2017-11-29

Issue

No. 1 (2017): Journal of the Belarusian State University. Chemistry

Section

Original Articles

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How to Cite

[1]
Kravchenko, E.S. et al. 2017. High-temperature oxygen nonstoichiometry and electrical conductivity of layered Ln2–xSrxNiO4–δ (Ln – La, Pr, Nd; х = 1.0 –1.6) nickelates. Journal of the Belarusian State University. Chemistry. 1 (Nov. 2017), 43–49.