Oxygen surface exchange kinetics and electronic conductivity of the third-order 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

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

Abstract

The third-order Ruddlesden-Popper phase Pr4Ni2.7Co0.3O10-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 ≤ pO2/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 ≤ pO2/bar ≤1) and temperature (600 ≤ T/°C ≤ 850). Oxygen surface exchange coefficients kq, calculated from the resistance of the electrode, show relatively high values (e.g. kq = 1.5 × 10 6 cm s−1 at 800 °C and 2 × 10 1 bar pO2). Chemical surface exchange coefficients kchem of oxygen were obtained from the peak frequency or the chemical capacitance as determined by impedance spectroscopy.

Originalspracheenglisch
Aufsatznummer115282
FachzeitschriftSolid State Ionics
Jahrgang348
DOIs
PublikationsstatusVeröffentlicht - Mai 2020

ASJC Scopus subject areas

  • Chemie (insg.)
  • Werkstoffwissenschaften (insg.)
  • Physik der kondensierten Materie
  • Allgemeine Materialwissenschaften

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)

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