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
(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.
(Less)
- author
- organization
- publishing date
- 2020-09-21
- 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}}, }