Influence of the oxygen electrode and inter-diffusion barrier on the degradation of solid oxide electrolysis cells

Hjalmarsson, Per; Sun, Xiufu; Liu, Yilin; Chen, Ming

doi:10.1016/j.jpowsour.2012.08.063

Cited by 136 publications

(121 citation statements)

References 29 publications

Supporting

Mentioning

112

Contrasting

Unclassified

Order By: Relevance

“…12,28,29 A complete assignment to gas conversion, diffusion, and three phase boundary (TPB) processes was performed for the particular SOEC in this work. The processes along with their relaxation frequencies are listed in Table I.…”

Section: Electrochemical Analysismentioning

confidence: 99%

“…Durability testing of SOEC cells have previously been reported both for steam and co-electrolysis conditions. [12][13][14][15] The cells have been tested for thousands of hours under different testing conditions such as temperature, gas composition and applied current. [12][13][14][15][16][17][18] From a system point of view, it is desirable to operate SOEC at thermoneutral voltage, i.e.…”

mentioning

confidence: 99%

See 1 more Smart Citation

A Comparative Study of Durability of Solid Oxide Electrolysis Cells Tested for Co-Electrolysis under Galvanostatic and Potentiostatic Conditions

Rao¹,

Sun²,

Hagen³

2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

State-of-the-art SOECs consisting of a nickel-yttria stabilized zirconia (Ni-YSZ) fuel electrode, YSZ electrolyte and lanthanum strontium cobaltite ferrite-gadolinium doped ceria (LSCF-GDC) composite oxygen electrode were tested under co-electrolysis (H 2 O+CO 2 ) conditions. The aim in this study was to compare the SOEC durability under co-electrolysis conditions between galvanostatic and potentiostatic modes. Specifically, the cells were operated at 0.75 A/cm 2 (galvanostatic) and at 1.2 V (potentiostatic) at 750 • C for over 1000 hours. In both modes, a larger degradation was observed initially for the first 200 hours of testing, followed by a more stable performance over longer operating times. Interestingly, there was a difference in trends of serial and polarization resistances' evolution. In galvanostatic mode of operation, both increased while for potentiostatic mode only the polarization resistance increased over time. The difference of the degradation was attributed to the overpotentials being experienced by the cells in the respective modes. Trends of the area specific resistance (ASR) and detailed electrochemical analysis of the performance of the cell under durability conditions for both modes indicated that the degradation was due to both the fuel electrode and the oxygen electrode, with an additional contribution from fuel electrode in galvanostatic testing. Microstructural analysis also confirmed the degradation of the active fuel electrode.

show abstract

Section: Electrochemical Analysismentioning

confidence: 99%

mentioning

confidence: 99%

A Comparative Study of Durability of Solid Oxide Electrolysis Cells Tested for Co-Electrolysis under Galvanostatic and Potentiostatic Conditions

Rao¹,

Sun²,

Hagen³

2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…From a more fundamental point of view it also changes the reaction mechanism from relying on a triple phase boundary (TPB) reaction site to a reaction zone for MIEC electrodes (33)(34)(35). The first MIEC based oxygen electrodes applied for SOEC at DTU Energy were based on LSCF/CGO (lanthanum-strontium-iron-cobaltite/gadoliniumdoped-ceria) electrodes and the achieved long-term stability improvement was reported by Hjalmarsson et al (36). Later, the improved LSC/CGO (lanthanum-strontiumcobaltite) has been applied.…”

Section: Improved Oxygen Electrodesmentioning

confidence: 99%

A Decade of Solid Oxide Electrolysis Improvements at DTU Energy

et al. 2017

Self Cite

View full text Add to dashboard Cite

Solid oxide electrolysis cells (SOECs) can efficiently convert electrical energy (e.g. surplus wind power) to energy stored in fuels such as hydrogen or other synthetic fuels. Performance and durability of the SOEC has increased orders of magnitudes within the last decade. This paper presents a short review of the R&D work on SOEC single cells conducted at DTU Energy from 2005 to 2015. The SOEC improvements have involved increasing the of the oxygen electrode performance, elimination of impurities in the feed streams, optimization of processing routes, and fuel electrode structure optimization. All together, these improvements have led to a decrease in long-term degradation rate from 40 %/kh to 0.4 %/kh for steam electrolysis at -1 A/cm 2 , while the initial area specific resistance has been decreased from 0.44 cm 2 to 0.15 cm 2 at -0.5 A/cm 2 and 750 C.

show abstract

“…Excessive amount of oxygen is generated as the result of the distribution of vacancies in the YSZ/LSM interface, and it leads to peeling of oxygen electrode and increase of polarization resistance [3e5]. Pattaraporn [6] compared the electrolysis performance of SOEC using LSM-YSZ as well as (La,Sr)(Co,Fe)O 3 (LSCF) as oxygen electrode at 550e800 C. The result indicated that LSCF shows greater electrochemical activity than LSM, mainly because LSCF features both ionically and electrically conducting, as well as lower polarization resistance [7]. However since LSCF and YSZ could react with each other at SOEC's operating temperature [8], a separate sheet of (Gd,Ce)O 2 (GDC) is placed in-between in order to enhance stability of the whole system.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of polarization and hydrogen production efficiency of solid oxide electrolysis stack with La0.6Sr0.4Co0.2Fe0.8O3−δ- Ce0.9Gd0.1O1.95 oxygen electrode

Liu

Wang

Hao

et al. 2016

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

Influence of the oxygen electrode and inter-diffusion barrier on the degradation of solid oxide electrolysis cells

Cited by 136 publications

References 29 publications

A Comparative Study of Durability of Solid Oxide Electrolysis Cells Tested for Co-Electrolysis under Galvanostatic and Potentiostatic Conditions

A Comparative Study of Durability of Solid Oxide Electrolysis Cells Tested for Co-Electrolysis under Galvanostatic and Potentiostatic Conditions

A Decade of Solid Oxide Electrolysis Improvements at DTU Energy

Evaluation of polarization and hydrogen production efficiency of solid oxide electrolysis stack with La0.6Sr0.4Co0.2Fe0.8O3−δ- Ce0.9Gd0.1O1.95 oxygen electrode

Contact Info

Product

Resources

About