Degradation in Solid Oxide Electrolysis Cells During Long Term Testing

X. Sun*, P. V. Hendriksen, M. B. Mogensen, M. Chen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In this work, we report a 4,400 h test of a state‐of‐the‐art Ni‐YSZ (yttria stabilized zirconia) electrode supported solid oxide electrolysis cell. The electrolysis test was carried out at 800 °C, –1 A cm−2 with 10% H2 + 90% H2O supplied to Ni‐YSZ electrode compartment. Except for the first 250 h of fast initial degradation, the cell showed rather stable performance with a moderate degradation rate of around 25 mV per 1,000 h. The electrochemical impedance spectra (EIS) acquired during the test show that both serial resistance and electrode polarization resistance increased during the durability test. Further impedance analyzes show that both the LSCF (strontium and cobalt co‐doped lanthanum ferrite)‐CGO (gadolinium doped ceria) electrode and Ni‐YSZ electrode degraded and the degradation was dominated by the Ni‐YSZ electrode. Post mortem analysis on the Ni‐YSZ electrode revealed loss of contact between Ni‐Ni grains, Ni‐YSZ grains and increased porosity inside the active layer. The microstructural changes were most severe at steam gas inlet and became less severe along the gas flow path. The present test results show that this type of cell can be used for early demonstration of solid oxide cell operation at electrolysis current densities around 1 A cm−2.
Original languageEnglish
JournalFuel Cells
Volume19
Issue number6
Pages (from-to)740-747
Number of pages8
ISSN1615-6846
DOIs
Publication statusPublished - 2019

Keywords

  • Electrolysis
  • Hydrogen production
  • Long term performance
  • Ni migration
  • Solid oxide cell

Cite this

@article{4dda56a171e64cff8ac78a934d35dfbf,
title = "Degradation in Solid Oxide Electrolysis Cells During Long Term Testing",
abstract = "In this work, we report a 4,400 h test of a state‐of‐the‐art Ni‐YSZ (yttria stabilized zirconia) electrode supported solid oxide electrolysis cell. The electrolysis test was carried out at 800 °C, –1 A cm−2 with 10{\%} H2 + 90{\%} H2O supplied to Ni‐YSZ electrode compartment. Except for the first 250 h of fast initial degradation, the cell showed rather stable performance with a moderate degradation rate of around 25 mV per 1,000 h. The electrochemical impedance spectra (EIS) acquired during the test show that both serial resistance and electrode polarization resistance increased during the durability test. Further impedance analyzes show that both the LSCF (strontium and cobalt co‐doped lanthanum ferrite)‐CGO (gadolinium doped ceria) electrode and Ni‐YSZ electrode degraded and the degradation was dominated by the Ni‐YSZ electrode. Post mortem analysis on the Ni‐YSZ electrode revealed loss of contact between Ni‐Ni grains, Ni‐YSZ grains and increased porosity inside the active layer. The microstructural changes were most severe at steam gas inlet and became less severe along the gas flow path. The present test results show that this type of cell can be used for early demonstration of solid oxide cell operation at electrolysis current densities around 1 A cm−2.",
keywords = "Electrolysis, Hydrogen production, Long term performance, Ni migration, Solid oxide cell",
author = "X. Sun and Hendriksen, {P. V.} and Mogensen, {M. B.} and M. Chen",
year = "2019",
doi = "10.1002/fuce.201900081",
language = "English",
volume = "19",
pages = "740--747",
journal = "Fuel Cells",
issn = "1615-6846",
publisher = "Wiley - V C H Verlag GmbH & Co. KGaA",
number = "6",

}

Degradation in Solid Oxide Electrolysis Cells During Long Term Testing. / Sun, X.; Hendriksen, P. V.; Mogensen, M. B.; Chen, M.

In: Fuel Cells, Vol. 19, No. 6, 2019, p. 740-747.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Degradation in Solid Oxide Electrolysis Cells During Long Term Testing

AU - Sun, X.

AU - Hendriksen, P. V.

AU - Mogensen, M. B.

AU - Chen, M.

PY - 2019

Y1 - 2019

N2 - In this work, we report a 4,400 h test of a state‐of‐the‐art Ni‐YSZ (yttria stabilized zirconia) electrode supported solid oxide electrolysis cell. The electrolysis test was carried out at 800 °C, –1 A cm−2 with 10% H2 + 90% H2O supplied to Ni‐YSZ electrode compartment. Except for the first 250 h of fast initial degradation, the cell showed rather stable performance with a moderate degradation rate of around 25 mV per 1,000 h. The electrochemical impedance spectra (EIS) acquired during the test show that both serial resistance and electrode polarization resistance increased during the durability test. Further impedance analyzes show that both the LSCF (strontium and cobalt co‐doped lanthanum ferrite)‐CGO (gadolinium doped ceria) electrode and Ni‐YSZ electrode degraded and the degradation was dominated by the Ni‐YSZ electrode. Post mortem analysis on the Ni‐YSZ electrode revealed loss of contact between Ni‐Ni grains, Ni‐YSZ grains and increased porosity inside the active layer. The microstructural changes were most severe at steam gas inlet and became less severe along the gas flow path. The present test results show that this type of cell can be used for early demonstration of solid oxide cell operation at electrolysis current densities around 1 A cm−2.

AB - In this work, we report a 4,400 h test of a state‐of‐the‐art Ni‐YSZ (yttria stabilized zirconia) electrode supported solid oxide electrolysis cell. The electrolysis test was carried out at 800 °C, –1 A cm−2 with 10% H2 + 90% H2O supplied to Ni‐YSZ electrode compartment. Except for the first 250 h of fast initial degradation, the cell showed rather stable performance with a moderate degradation rate of around 25 mV per 1,000 h. The electrochemical impedance spectra (EIS) acquired during the test show that both serial resistance and electrode polarization resistance increased during the durability test. Further impedance analyzes show that both the LSCF (strontium and cobalt co‐doped lanthanum ferrite)‐CGO (gadolinium doped ceria) electrode and Ni‐YSZ electrode degraded and the degradation was dominated by the Ni‐YSZ electrode. Post mortem analysis on the Ni‐YSZ electrode revealed loss of contact between Ni‐Ni grains, Ni‐YSZ grains and increased porosity inside the active layer. The microstructural changes were most severe at steam gas inlet and became less severe along the gas flow path. The present test results show that this type of cell can be used for early demonstration of solid oxide cell operation at electrolysis current densities around 1 A cm−2.

KW - Electrolysis

KW - Hydrogen production

KW - Long term performance

KW - Ni migration

KW - Solid oxide cell

U2 - 10.1002/fuce.201900081

DO - 10.1002/fuce.201900081

M3 - Journal article

VL - 19

SP - 740

EP - 747

JO - Fuel Cells

JF - Fuel Cells

SN - 1615-6846

IS - 6

ER -