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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

Kooser, Kuno ; Käämbre, Tanel LU ; Vestli, Mihkel ; Joost, Urmas ; Urpelainen, Samuli LU ; Kook, Mati ; Bournel, Fabrice ; Gallet, Jean Jacques ; Lust, Enn and Kukk, Edwin , et al. (2020) In International Journal of Hydrogen Energy 45(46). p.25286-25298
Abstract

In 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... (More)

In 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 Ce3d and Ni2p photoelectron spectra caused by electrode potential and H2 pressure variations were observed and estimated by curve fitting procedure. The O1s 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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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
EIS, NAP-XPS, Ni-GDC, Operando, Solid oxide fuel cell, Surface chemistry
in
International Journal of Hydrogen Energy
volume
45
issue
46
pages
13 pages
publisher
Elsevier
external identifiers
  • scopus:85089195308
ISSN
0360-3199
DOI
10.1016/j.ijhydene.2020.06.228
language
English
LU publication?
yes
id
d4430f44-6996-4a57-a472-e777da861797
date added to LUP
2020-08-20 08:51:40
date last changed
2023-02-28 15:44:51
@article{d4430f44-6996-4a57-a472-e777da861797,
  abstract     = {{<p>In 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−Ce<sub>0.9</sub>Gd<sub>0.1</sub>O<sub>2−δ</sub> model electrode. In our measurements, we have used the novel three electrode dual-chamber electrochemical cell developed in our previous work at different H<sub>2</sub> pressures and at different electrochemical conditions at around 650 °C. The possible redox reactions on the anode surface (Ni<sup>2+</sup>↔Ni<sup>0</sup>,Ce<sup>4+</sup>↔Ce<sup>3+</sup>) 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 Ce3d and Ni2p photoelectron spectra caused by electrode potential and H<sub>2</sub> pressure variations were observed and estimated by curve fitting procedure. The O1s 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.</p>}},
  author       = {{Kooser, Kuno and Käämbre, Tanel and Vestli, Mihkel and Joost, Urmas and Urpelainen, Samuli and Kook, Mati and Bournel, Fabrice and Gallet, Jean Jacques and Lust, Enn and Kukk, Edwin and Nurk, Gunnar}},
  issn         = {{0360-3199}},
  keywords     = {{EIS; NAP-XPS; Ni-GDC; Operando; Solid oxide fuel cell; Surface chemistry}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{46}},
  pages        = {{25286--25298}},
  publisher    = {{Elsevier}},
  series       = {{International Journal of Hydrogen Energy}},
  title        = {{Operando high-temperature near-ambient pressure X-ray photoelectron spectroscopy and impedance spectroscopy study of Ni−Ce<sub>0.9</sub>Gd<sub>0.1</sub>O<sub>2−δ</sub> solid oxide fuel cell anode}},
  url          = {{http://dx.doi.org/10.1016/j.ijhydene.2020.06.228}},
  doi          = {{10.1016/j.ijhydene.2020.06.228}},
  volume       = {{45}},
  year         = {{2020}},
}