Oxygen surface exchange kinetics and electronic conductivity of the thirdorder Ruddlesden-Popper phase Pr4Ni2.7Co0.3O10-δ

Christian Berger, Edith Bucher*, Andreas Egger, Nina Schrödl, Judith Lammer, Christian Gspan, Rotraut Merkle, Werner Grogger, Joachim Maier, Werner Sitte

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The third-order Ruddlesden-Popper phase Pr 4Ni 2.7Co 0.3O 10-δ (PNCO43) was synthesized by a freeze drying process. Phase purity and crystal structure were determined by X-ray diffraction and Rietveld analysis. The electronic conductivity of a bulk sample obtained by a two-step sintering process was measured by the four-point dc van der Pauw method as a function of temperature (50 ≤ T/°C ≤ 800) and oxygen partial pressure (1 × 10 3 ≤ pO 2/bar ≤1). Dense thin-film PNCO43 microelectrodes were prepared by pulsed laser deposition and photolithography on yttria-stabilised zirconia substrates. The thin-films were characterized by X-ray diffraction, scanning electron microscopy, scanning transmission electron microscopy, and inductively coupled plasma optical emission spectroscopy. Individual resistive and capacitive processes were investigated with electrochemical impedance spectroscopy as a function of the oxygen partial pressure (1 × 10 3 ≤ pO 2/bar ≤1) and temperature (600 ≤ T/°C ≤ 850). Oxygen surface exchange coefficients k q, calculated from the resistance of the electrode, show relatively high values (e.g. k q = 1.5 × 10 6 cm s −1 at 800 °C and 2 × 10 1 bar pO 2). Chemical surface exchange coefficients k chem of oxygen were obtained from the peak frequency or the chemical capacitance as determined by impedance spectroscopy.

Original languageEnglish
Article number115282
Number of pages9
JournalSolid State Ionics
Volume348
DOIs
Publication statusPublished - May 2020

Keywords

  • Oxygen surface exchange
  • Praseodymium nickelate
  • Solid oxide electrolyzer cell anode
  • Solid oxide fuel cell cathode
  • Third-order Ruddlesden-Popper phase

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Chemistry(all)

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)

Fingerprint Dive into the research topics of 'Oxygen surface exchange kinetics and electronic conductivity of the thirdorder Ruddlesden-Popper phase Pr4Ni2.7Co0.3O10-δ'. Together they form a unique fingerprint.

Cite this