In-operando observation of microstructural evolution in a solid oxide cell electrolyte operating at high polarization

J. X. Sierra, H. F. Poulsen, P. S. Jørgensen, C. Detlefs, P. Cook, H. Simons, A. C. Jakobsen, J. R. Bowen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In the present work a symmetric scandia yttria stabilized zirconia electrolyte based solid oxide cell is investigated in-operando by synchrotron X-ray diffraction as a function of time and position within the electrolyte while annealing at 700 °C in air and at a polarization of 2 V. In addition, scanning electron microscopy experiments are carried out on similar cells operating at temperatures of 700, 800 and 900 °C. Void formation in the grain boundaries of the electrolyte close to the anode/electrolyte interface is detected as early as 6 h. No clear trend is observed with respect to cell operation time and temperature in cells with equal grain size. However, grain boundary surface area may be inversely related to the frequency of void observations. A decrease of d-spacing in the anode interface region can be attributed to compressive stress associated with oxygen pressure build up. Decrease of d-spacing in the cathode/electrolyte region could be associated to oxide ion deficiency. Dark field X-ray microscopy is used to map for the first time the strain gradients within an electrolyte grain close to the anode region. Changes in strain domains after 10.5 h at operating conditions are assumed to be associated with early stages of void formation.

Original languageEnglish
JournalJournal of Power Sources
Volume413
Pages (from-to)351-359
ISSN0378-7753
DOIs
Publication statusPublished - 2019

Keywords

  • Grain boundary
  • Nanoscale void formation
  • Solid oxide cell
  • Strain
  • X-ray diffraction

Cite this

@article{c46114e67a9f4123860560f889711d6d,
title = "In-operando observation of microstructural evolution in a solid oxide cell electrolyte operating at high polarization",
abstract = "In the present work a symmetric scandia yttria stabilized zirconia electrolyte based solid oxide cell is investigated in-operando by synchrotron X-ray diffraction as a function of time and position within the electrolyte while annealing at 700 °C in air and at a polarization of 2 V. In addition, scanning electron microscopy experiments are carried out on similar cells operating at temperatures of 700, 800 and 900 °C. Void formation in the grain boundaries of the electrolyte close to the anode/electrolyte interface is detected as early as 6 h. No clear trend is observed with respect to cell operation time and temperature in cells with equal grain size. However, grain boundary surface area may be inversely related to the frequency of void observations. A decrease of d-spacing in the anode interface region can be attributed to compressive stress associated with oxygen pressure build up. Decrease of d-spacing in the cathode/electrolyte region could be associated to oxide ion deficiency. Dark field X-ray microscopy is used to map for the first time the strain gradients within an electrolyte grain close to the anode region. Changes in strain domains after 10.5 h at operating conditions are assumed to be associated with early stages of void formation.",
keywords = "Grain boundary, Nanoscale void formation, Solid oxide cell, Strain, X-ray diffraction",
author = "Sierra, {J. X.} and Poulsen, {H. F.} and J{\o}rgensen, {P. S.} and C. Detlefs and P. Cook and H. Simons and Jakobsen, {A. C.} and Bowen, {J. R.}",
year = "2019",
doi = "10.1016/j.jpowsour.2018.12.057",
language = "English",
volume = "413",
pages = "351--359",
journal = "Journal of Power Sources",
issn = "0378-7753",
publisher = "Elsevier",

}

In-operando observation of microstructural evolution in a solid oxide cell electrolyte operating at high polarization. / Sierra, J. X.; Poulsen, H. F.; Jørgensen, P. S.; Detlefs, C.; Cook, P.; Simons, H.; Jakobsen, A. C.; Bowen, J. R.

In: Journal of Power Sources, Vol. 413, 2019, p. 351-359.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - In-operando observation of microstructural evolution in a solid oxide cell electrolyte operating at high polarization

AU - Sierra, J. X.

AU - Poulsen, H. F.

AU - Jørgensen, P. S.

AU - Detlefs, C.

AU - Cook, P.

AU - Simons, H.

AU - Jakobsen, A. C.

AU - Bowen, J. R.

PY - 2019

Y1 - 2019

N2 - In the present work a symmetric scandia yttria stabilized zirconia electrolyte based solid oxide cell is investigated in-operando by synchrotron X-ray diffraction as a function of time and position within the electrolyte while annealing at 700 °C in air and at a polarization of 2 V. In addition, scanning electron microscopy experiments are carried out on similar cells operating at temperatures of 700, 800 and 900 °C. Void formation in the grain boundaries of the electrolyte close to the anode/electrolyte interface is detected as early as 6 h. No clear trend is observed with respect to cell operation time and temperature in cells with equal grain size. However, grain boundary surface area may be inversely related to the frequency of void observations. A decrease of d-spacing in the anode interface region can be attributed to compressive stress associated with oxygen pressure build up. Decrease of d-spacing in the cathode/electrolyte region could be associated to oxide ion deficiency. Dark field X-ray microscopy is used to map for the first time the strain gradients within an electrolyte grain close to the anode region. Changes in strain domains after 10.5 h at operating conditions are assumed to be associated with early stages of void formation.

AB - In the present work a symmetric scandia yttria stabilized zirconia electrolyte based solid oxide cell is investigated in-operando by synchrotron X-ray diffraction as a function of time and position within the electrolyte while annealing at 700 °C in air and at a polarization of 2 V. In addition, scanning electron microscopy experiments are carried out on similar cells operating at temperatures of 700, 800 and 900 °C. Void formation in the grain boundaries of the electrolyte close to the anode/electrolyte interface is detected as early as 6 h. No clear trend is observed with respect to cell operation time and temperature in cells with equal grain size. However, grain boundary surface area may be inversely related to the frequency of void observations. A decrease of d-spacing in the anode interface region can be attributed to compressive stress associated with oxygen pressure build up. Decrease of d-spacing in the cathode/electrolyte region could be associated to oxide ion deficiency. Dark field X-ray microscopy is used to map for the first time the strain gradients within an electrolyte grain close to the anode region. Changes in strain domains after 10.5 h at operating conditions are assumed to be associated with early stages of void formation.

KW - Grain boundary

KW - Nanoscale void formation

KW - Solid oxide cell

KW - Strain

KW - X-ray diffraction

U2 - 10.1016/j.jpowsour.2018.12.057

DO - 10.1016/j.jpowsour.2018.12.057

M3 - Journal article

VL - 413

SP - 351

EP - 359

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

ER -