University of Oulu

Kuno Kooser, Tanel Käämbre, Mihkel Vestli, Urmas Joost, Samuli Urpelainen, Mati Kook, Fabrice Bournel, Jean-Jacques Gallet, Enn Lust, Edwin Kukk, Gunnar Nurk, Operando high-temperature near-ambient pressure X-ray photoelectron spectroscopy and impedance spectroscopy study of Ni−Ce0.9Gd0.1O2−δ solid oxide fuel cell anode, International Journal of Hydrogen Energy, Volume 45, Issue 46, 2020, Pages 25286-25298, ISSN 0360-3199,

Operando high-temperature near-ambient pressure X-ray photoelectron spectroscopy and impedance spectroscopy study of Ni–Ce0.9Gd0.1O2-δ solid oxide fuel cell anode

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Author: Kooser, Kuno1,2; Käämbre, Tanel1; Vestli, Mihkel3;
Organizations: 1University of Tartu, Institute of Physics, W. Ostwaldi Str. 1, 50411 Tartu, Estonia
2University of Turku, Department of Physics and Astronomy, 20014 Turku, Finland
3University of Tartu Institute of Chemistry, Ravila 14a Street, Tartu 50411, Estonia
4MAX IV Laboratory, Lund University, P.O. Box 118, SE-22100, Lund, Sweden
5Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014, Oulu, Finland
6Sorbonne Université, CNRS, Laboratoire de Chimie Physique Matière et Rayonnement Campus Pierre et Marie Curie, F-75005, Paris, France
7Synchrotron SOLEIL, LOrme des Merisiers, Saint-Aubin, F-91192 Gif-sur-Yvette, France
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 14.3 MB)
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Language: English
Published: Elsevier, 2020
Publish Date: 2022-08-08


n this study we present the results of operando high temperature near-ambient-pressure x-ray photoelectron spectroscopy (HT-NAP-XPS) measurements of a pulsed laser deposited thin film Ni–Ce0.9Gd0.1O2-δ model electrode. In our measurements, we have used the novel three electrode dual-chamber electrochemical cell developed in our previous work at different H₂ pressures and at different electrochemical conditions at around 650 °C.

The possible redox reactions on the anode surface (Ni²⁺ ↔ Ni⁰, Ce⁴⁺ ↔ Ce³⁺) were investigated by HT-NAP-XPS technique simultaneously with electrochemical impedance spectroscopy measurements. The oxygen partial pressure in counter and reference electrode compartment was controlled at 0.2 bar. Changes in electronic structure of the Ce 3d and Ni 2p photoelectron spectra caused by electrode potential and H₂ pressure variations were observed and estimated by curve fitting procedure. The O 1s and valence band photoelectron signals were used for depth probing of the chemical composition and redox changes at Ni-GDC and for studying the influence of the electrochemical polarization on the chemical state of Ni-GDC surface atoms.

As a result changes in oxidation state of electrode surface atoms caused by electrode polarization and oxide ion flux through the membrane were detected with simultaneous significant variation of electrochemical impedance.

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Series: International journal of hydrogen energy
ISSN: 0360-3199
ISSN-E: 0360-3199
ISSN-L: 0360-3199
Volume: 45
Issue: 46
Pages: 25286 - 25298
DOI: 10.1016/j.ijhydene.2020.06.228
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: This work was supported by the EU through the European Regional Development Fund under projects TK141 Advanced materials and high-technology devices for energy recuperation systems (2014-2020.4.01.15–0011), by the Estonian Research Council (PUT551, PUT735), by Estonian target research project IUT20-13 and by the Academy of Finland. S.U. acknowledges funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme, Project SURFACE (Grant Agreement No. 717022) and from the Academy of Finland inSTREAMS profiling in grant no. 326291.
EU Grant Number: (717022) SURFACE - The unexplored world of aerosol surfaces and their impacts.
Copyright information: © 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license