3D Microstructural Characterization of Ni/YSZ Electrodes Exposed to 1 Year of Electrolysis Testing

M. Trini*, P. S. Jørgensen, A. Hauch, J. J. Bentzen, P. V. Hendriksen, M. Chen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Long-term operation strongly affects the microstructure of Ni/YSZ cermets used in state of the art fuel electrodes for solid oxide cells. The microstructural changes are considered to heavily affect the cell degradation. In this paper, the characterization of the Ni/YSZ electrode of a solid oxide electrolysis cell tested as part of a stack tested for 1 year was performed through focused ion beam-scanning electron microscopy and energy dispersive X-ray spectroscopy. A reference cell and two locations of interest in the tested cell were selected: one at the steam inlet side and the other at the outlet. Considerable microstructural changes were observed in the tested cell compared to the reference cell and between the inlet and outlet side. A decrease in Ni (from 30% in the reference cell to 24% in the tested cell), and in percolating triple phase boundaries length (from 2.83 mu m/mu m(3) in the reference cell to 0.76 mu m/mu m(3) in the tested cell) was observed in the active fuel electrode. Based on the results of this work and previous studies we hypothesize that the degradation trend between different operating conditions at the inlet and outlet of the cell is related to the current redistribution inside the cell. (C) 2019 The Electrochemical Society.
Original languageEnglish
JournalJournal of the Electrochemical Society
Volume166
Issue number2
Pages (from-to)F158-F167
ISSN0013-4651
DOIs
Publication statusPublished - 2019

Cite this

@article{c67726a56627405ca8fd99edc599d1a4,
title = "3D Microstructural Characterization of Ni/YSZ Electrodes Exposed to 1 Year of Electrolysis Testing",
abstract = "Long-term operation strongly affects the microstructure of Ni/YSZ cermets used in state of the art fuel electrodes for solid oxide cells. The microstructural changes are considered to heavily affect the cell degradation. In this paper, the characterization of the Ni/YSZ electrode of a solid oxide electrolysis cell tested as part of a stack tested for 1 year was performed through focused ion beam-scanning electron microscopy and energy dispersive X-ray spectroscopy. A reference cell and two locations of interest in the tested cell were selected: one at the steam inlet side and the other at the outlet. Considerable microstructural changes were observed in the tested cell compared to the reference cell and between the inlet and outlet side. A decrease in Ni (from 30{\%} in the reference cell to 24{\%} in the tested cell), and in percolating triple phase boundaries length (from 2.83 mu m/mu m(3) in the reference cell to 0.76 mu m/mu m(3) in the tested cell) was observed in the active fuel electrode. Based on the results of this work and previous studies we hypothesize that the degradation trend between different operating conditions at the inlet and outlet of the cell is related to the current redistribution inside the cell. (C) 2019 The Electrochemical Society.",
author = "M. Trini and J{\o}rgensen, {P. S.} and A. Hauch and Bentzen, {J. J.} and Hendriksen, {P. V.} and M. Chen",
year = "2019",
doi = "10.1149/2.1281902jes",
language = "English",
volume = "166",
pages = "F158--F167",
journal = "Journal of The Electrochemical Society",
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publisher = "The Electrochemical Society",
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}

3D Microstructural Characterization of Ni/YSZ Electrodes Exposed to 1 Year of Electrolysis Testing. / Trini, M.; Jørgensen, P. S.; Hauch, A.; Bentzen, J. J.; Hendriksen, P. V.; Chen, M.

In: Journal of the Electrochemical Society, Vol. 166, No. 2, 2019, p. F158-F167.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - 3D Microstructural Characterization of Ni/YSZ Electrodes Exposed to 1 Year of Electrolysis Testing

AU - Trini, M.

AU - Jørgensen, P. S.

AU - Hauch, A.

AU - Bentzen, J. J.

AU - Hendriksen, P. V.

AU - Chen, M.

PY - 2019

Y1 - 2019

N2 - Long-term operation strongly affects the microstructure of Ni/YSZ cermets used in state of the art fuel electrodes for solid oxide cells. The microstructural changes are considered to heavily affect the cell degradation. In this paper, the characterization of the Ni/YSZ electrode of a solid oxide electrolysis cell tested as part of a stack tested for 1 year was performed through focused ion beam-scanning electron microscopy and energy dispersive X-ray spectroscopy. A reference cell and two locations of interest in the tested cell were selected: one at the steam inlet side and the other at the outlet. Considerable microstructural changes were observed in the tested cell compared to the reference cell and between the inlet and outlet side. A decrease in Ni (from 30% in the reference cell to 24% in the tested cell), and in percolating triple phase boundaries length (from 2.83 mu m/mu m(3) in the reference cell to 0.76 mu m/mu m(3) in the tested cell) was observed in the active fuel electrode. Based on the results of this work and previous studies we hypothesize that the degradation trend between different operating conditions at the inlet and outlet of the cell is related to the current redistribution inside the cell. (C) 2019 The Electrochemical Society.

AB - Long-term operation strongly affects the microstructure of Ni/YSZ cermets used in state of the art fuel electrodes for solid oxide cells. The microstructural changes are considered to heavily affect the cell degradation. In this paper, the characterization of the Ni/YSZ electrode of a solid oxide electrolysis cell tested as part of a stack tested for 1 year was performed through focused ion beam-scanning electron microscopy and energy dispersive X-ray spectroscopy. A reference cell and two locations of interest in the tested cell were selected: one at the steam inlet side and the other at the outlet. Considerable microstructural changes were observed in the tested cell compared to the reference cell and between the inlet and outlet side. A decrease in Ni (from 30% in the reference cell to 24% in the tested cell), and in percolating triple phase boundaries length (from 2.83 mu m/mu m(3) in the reference cell to 0.76 mu m/mu m(3) in the tested cell) was observed in the active fuel electrode. Based on the results of this work and previous studies we hypothesize that the degradation trend between different operating conditions at the inlet and outlet of the cell is related to the current redistribution inside the cell. (C) 2019 The Electrochemical Society.

U2 - 10.1149/2.1281902jes

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