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

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

4 Zitate (Scopus)

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.

OriginalspracheEnglisch
Aufsatznummer115282
Seitenumfang9
FachzeitschriftSolid State Ionics
Jahrgang348.2020
AusgabenummerMay
DOIs
PublikationsstatusVeröffentlicht - 8 März 2020

Bibliographische Notiz

Funding Information:
Financial support by the Austrian Research Promotion Agency FFG (project SENTECH, no. 853538 ) and the “ Klima- und Energiefonds ” within the program “Energieforschung (e!MISSION)” is gratefully acknowledged. The authors would like to thank Benjamin Stuhlhofer for preparation of PLD thin-films, Helga Hoier for XRD measurements of the PNCO43 thin-film sample, Annette Fuchs for SEM measurements of the PNCO43 thin-film sample, Armin Sorg for SPS experiments (all from Max Planck Institute for Solid State Research), and Samir Hammoud (Max Planck Institute for Intelligent Systems) for ICP-OES measurement of PNCO43. The authors want to acknowledge Lukas Szabados for laboratory work assistance as well as Gerhard Hawranek for SEM-EDX measurements of the bulk sample (both from Montanuniversitaet Leoben) and Mrs. Martina Dienstleder (Graz Centre for Electron Microscopy) for FIB preparation.

Publisher Copyright:
© 2020 Elsevier B.V.

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