Unwinding Entangled Degradation Mechanisms in Solid Oxide Electrolysis Cells Through Electrode Modifications and Impedance Analysis

M. Rao*, S. H. Jensen, X. Sun, A. Hagen

*Corresponding author for this work

Research output: Contribution to journalConference articleResearchpeer-review

52 Downloads (Pure)

Abstract

In the renewable energy scenario, energy storage is of essence. In this context, power-to-liquid (PtL) and power-to-gas (PtG) concepts have attracted large attention, where the use of solid oxide electrolysis cells (SOECs) has a huge potential, due to their high conversion efficiencies. However, performance and durability of these cells still need to be improved for a large-scale commercialization of the SOEC technology. It is often difficult to identify the various loss and degradation mechanisms limiting the cell performance and durability. This paper contributes to this scientific discussion, by providing a careful analysis of the degradation mechanisms occurring in three different cells during long-term H2O and CO2 co-electrolysis, at 1,200 mV. Electrochemical impedance spectroscopy (EIS) is measured before, during and after the electrolysis operation, and is utilized to address the individual electrode degradation mechanisms and the development of leaks through the electrolyte. Moreover, the leak rates under open circuit voltage (OCV) measurements were compared. In addition, microstructural analysis of the electrodes and electrolytes is related to the electrochemical findings to contribute to the discussion on the interdependency of the degradation mechanisms.
Original languageEnglish
JournalFuel Cells
Volume19
Issue number4
Pages (from-to)445-457
ISSN1615-6846
DOIs
Publication statusPublished - 2019
Event13th EUROPEAN SOFC & SOE FORUM - Kultur- und Kongresszentrum Luzern, Lucerne, Switzerland
Duration: 3 Jul 20186 Jul 2018
Conference number: 13
http://www.efcf.com/

Conference

Conference13th EUROPEAN SOFC & SOE FORUM
Number13
LocationKultur- und Kongresszentrum Luzern
CountrySwitzerland
CityLucerne
Period03/07/201806/07/2018
Internet address

Bibliographical note

Special Issue: 13th European SOFC & SOE Forum

Keywords

  • Co-electrolysis
  • Distribution of Relaxation Times
  • Durability
  • Electrochemical Impedance Spectroscopy
  • Infiltration
  • Nickel Migration
  • Percolation
  • Potentiostatic
  • Solid Oxide Electrolysis Cell

Cite this

@inproceedings{bfb2e88e77604b6fa51df0a114de67c8,
title = "Unwinding Entangled Degradation Mechanisms in Solid Oxide Electrolysis Cells Through Electrode Modifications and Impedance Analysis",
abstract = "In the renewable energy scenario, energy storage is of essence. In this context, power-to-liquid (PtL) and power-to-gas (PtG) concepts have attracted large attention, where the use of solid oxide electrolysis cells (SOECs) has a huge potential, due to their high conversion efficiencies. However, performance and durability of these cells still need to be improved for a large-scale commercialization of the SOEC technology. It is often difficult to identify the various loss and degradation mechanisms limiting the cell performance and durability. This paper contributes to this scientific discussion, by providing a careful analysis of the degradation mechanisms occurring in three different cells during long-term H2O and CO2 co-electrolysis, at 1,200 mV. Electrochemical impedance spectroscopy (EIS) is measured before, during and after the electrolysis operation, and is utilized to address the individual electrode degradation mechanisms and the development of leaks through the electrolyte. Moreover, the leak rates under open circuit voltage (OCV) measurements were compared. In addition, microstructural analysis of the electrodes and electrolytes is related to the electrochemical findings to contribute to the discussion on the interdependency of the degradation mechanisms.",
keywords = "Co-electrolysis, Distribution of Relaxation Times, Durability, Electrochemical Impedance Spectroscopy, Infiltration, Nickel Migration, Percolation, Potentiostatic, Solid Oxide Electrolysis Cell",
author = "M. Rao and Jensen, {S. H.} and X. Sun and A. Hagen",
note = "Special Issue: 13th European SOFC & SOE Forum",
year = "2019",
doi = "10.1002/fuce.201800166",
language = "English",
volume = "19",
pages = "445--457",
journal = "Fuel Cells",
issn = "1615-6846",
publisher = "Wiley - V C H Verlag GmbH & Co. KGaA",
number = "4",

}

Unwinding Entangled Degradation Mechanisms in Solid Oxide Electrolysis Cells Through Electrode Modifications and Impedance Analysis. / Rao, M.; Jensen, S. H.; Sun, X.; Hagen, A.

In: Fuel Cells, Vol. 19, No. 4, 2019, p. 445-457.

Research output: Contribution to journalConference articleResearchpeer-review

TY - GEN

T1 - Unwinding Entangled Degradation Mechanisms in Solid Oxide Electrolysis Cells Through Electrode Modifications and Impedance Analysis

AU - Rao, M.

AU - Jensen, S. H.

AU - Sun, X.

AU - Hagen, A.

N1 - Special Issue: 13th European SOFC & SOE Forum

PY - 2019

Y1 - 2019

N2 - In the renewable energy scenario, energy storage is of essence. In this context, power-to-liquid (PtL) and power-to-gas (PtG) concepts have attracted large attention, where the use of solid oxide electrolysis cells (SOECs) has a huge potential, due to their high conversion efficiencies. However, performance and durability of these cells still need to be improved for a large-scale commercialization of the SOEC technology. It is often difficult to identify the various loss and degradation mechanisms limiting the cell performance and durability. This paper contributes to this scientific discussion, by providing a careful analysis of the degradation mechanisms occurring in three different cells during long-term H2O and CO2 co-electrolysis, at 1,200 mV. Electrochemical impedance spectroscopy (EIS) is measured before, during and after the electrolysis operation, and is utilized to address the individual electrode degradation mechanisms and the development of leaks through the electrolyte. Moreover, the leak rates under open circuit voltage (OCV) measurements were compared. In addition, microstructural analysis of the electrodes and electrolytes is related to the electrochemical findings to contribute to the discussion on the interdependency of the degradation mechanisms.

AB - In the renewable energy scenario, energy storage is of essence. In this context, power-to-liquid (PtL) and power-to-gas (PtG) concepts have attracted large attention, where the use of solid oxide electrolysis cells (SOECs) has a huge potential, due to their high conversion efficiencies. However, performance and durability of these cells still need to be improved for a large-scale commercialization of the SOEC technology. It is often difficult to identify the various loss and degradation mechanisms limiting the cell performance and durability. This paper contributes to this scientific discussion, by providing a careful analysis of the degradation mechanisms occurring in three different cells during long-term H2O and CO2 co-electrolysis, at 1,200 mV. Electrochemical impedance spectroscopy (EIS) is measured before, during and after the electrolysis operation, and is utilized to address the individual electrode degradation mechanisms and the development of leaks through the electrolyte. Moreover, the leak rates under open circuit voltage (OCV) measurements were compared. In addition, microstructural analysis of the electrodes and electrolytes is related to the electrochemical findings to contribute to the discussion on the interdependency of the degradation mechanisms.

KW - Co-electrolysis

KW - Distribution of Relaxation Times

KW - Durability

KW - Electrochemical Impedance Spectroscopy

KW - Infiltration

KW - Nickel Migration

KW - Percolation

KW - Potentiostatic

KW - Solid Oxide Electrolysis Cell

U2 - 10.1002/fuce.201800166

DO - 10.1002/fuce.201800166

M3 - Conference article

VL - 19

SP - 445

EP - 457

JO - Fuel Cells

JF - Fuel Cells

SN - 1615-6846

IS - 4

ER -