Interdiffusion at electrochemical interfaces between yttria-stabilized zirconia and doped ceria

Schwiers, Alexander; Lenser, Christian; Guillon, Olivier; Menzler, Norbert H.

doi:10.1016/j.jeurceramsoc.2023.06.015

Cited by 5 publications

(4 citation statements)

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“…In comparison to sample A the polarization resistance is decreased as expected from previous studies. 5,22,35,56 The reduced peak height of LF 1 and the frequency shift towards higher frequencies indicates a decrease of the charge transfer resistance. The reason for this impact of the GDC10-interlayer is not fully understood at this point.…”

Section: Resultsmentioning

confidence: 99%

“…The higher polarization resistance of sample A could also be explained by a formation of porosity at the interface between electrode and electrolyte which can be prevented by the application of a GDC interlayer. 56 It has also to be considered that the activation of the complete electrode through the Ni-contact layer might improve the electrode performance.…”

Section: Resultsmentioning

confidence: 99%

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Enhancement of Performance and Sulfur Tolerance of Ceria-Based Fuel Electrodes in Low Temperature SOFC

Kullmann,

Schwiers,

Juckel

et al. 2024

J. Electrochem. Soc.

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The trend of operating the solid oxide fuel cell at significantly lower operation temperatures enables the application of electrodes with finer microstructure or even nanostructured electrodes with increased active surface and enhanced performance. To maintain the high performance in hydrocarbon fuels commonly impurified with sulfur compounds, a required sulfur tolerance has to be maintained. In this study we compare performance and H2S-poisoning of four ceria-based electrodes: conventional Ni/Ce0.9Gd0.1O2-δ cermets and sub-µm scaled Ce0.8Gd0.2O2-δ-electrodes with and without infiltrated nickel. Symmetrical cells were operated in a hydrogen/steam/nitrogen gas mixture with and without minor amounts of H2S at 600 °C. The performance is analyzed by electrochemical impedance spectroscopy. The distribution of relaxation times is applied to deconvolute the electrochemical processes followed by a complex nonlinear least square fit to quantify the loss processes and the impact of sulfur.Whereas two different Ni/Ce0.9Gd0.1O2-δ cermet electrodes exhibit polarization resistances at 600 °C without / with 0.1 ppm H2S of 2.89 / 5.56 Ωcm² and 2.15 / 2.75 Ωcm², the single phase Ce0.8Gd0.2O2-δ electrode reaches 0.98 / 2.37 Ωcm². With an infiltration of Ni-nitrate forming nickel nanoparticles on the gadolinia-doped ceria-surfaces, the ASR could be drastically reduced to 0.32 / 0.37 Ωcm².

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Enhancement of Performance and Sulfur Tolerance of Ceria-Based Fuel Electrodes in Low Temperature SOFC

Kullmann,

Schwiers,

Juckel

et al. 2024

J. Electrochem. Soc.

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“…39–41 This behavior has also been documented in fluorite-type materials such as yttria-stabilized zirconia 42 or gadolinia-doped ceria. 43–46…”

Section: Discussionmentioning

confidence: 99%

Phase stability, redox-behavior and carbon-tolerance of Sr_1−x(Ti_0.3Fe_0.7−yNi_y)O_3−δ with exsolved nanoparticles

Schwiers,

Röhrer,

Lenser

et al. 2024

J. Mater. Chem. A

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“…To avoid this issue, the utilization of a tri-layer electrolyte with a Gd-doped ceria barrier between the electrode and the electrolyte was proposed. 41 Recently, the first prototypes of this cell have been developed and tested. 42 Reversible operation of solid oxide cells' can reduce their degradation under a regular operation without impurities.…”

Section: Chmentioning

confidence: 99%

Experimental Investigation of Naphthalene Induced Degradation of Reversible Solid Oxide Cells Operated on Bio-Syngas

Steinrücken,

Herrmann,

Kerscher

et al. 2024

J. Electrochem. Soc.

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The influence of the operational conditions and the electrode material on the degradation induced by the model tar naphthalene on 10 x 10 cm² fuel-electrode supported solid oxide cells operated on artificial bio-syngas under internal reforming conditions is experimentally investigated. Two different fuel electrodes are investigated based on yttrium-stabilized zirconia (YSZ) and gadolinium-doped ceria (GDC). A parameter study of the operational temperature and the operation mode (fuel cell or electrolysis mode) is conducted with the YSZ-based fuel electrode to quantify the effects on the cell degradation. The fuel off-gas composition and electrochemical impedance spectra are used to characterize the cell prior to the experiment and monitor its performance during the poisoning process. The influence of the tar on the Ni-YSZ electrode cell is investigated for an operation at 700 °C and 800 °C in fuel cell mode, and an operation at 700 °C in electrolysis mode. The experiment at 700 °C is repeated with the Ni-GDC electrode cell. At the increased operational temperature, the Ni-YSZ cell is more robust but carbon depositions occur. The voltage degradation during electrolysis operation increases significantly compared to fuel cell operation. The Ni-GDC electrode does not show an increased robustness compared to the Ni-YSZ electrode.

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Interdiffusion at electrochemical interfaces between yttria-stabilized zirconia and doped ceria

Cited by 5 publications

References 50 publications

Enhancement of Performance and Sulfur Tolerance of Ceria-Based Fuel Electrodes in Low Temperature SOFC

Enhancement of Performance and Sulfur Tolerance of Ceria-Based Fuel Electrodes in Low Temperature SOFC

Phase stability, redox-behavior and carbon-tolerance of Sr_1−x(Ti_0.3Fe_0.7−yNi_y)O_3−δ with exsolved nanoparticles

Experimental Investigation of Naphthalene Induced Degradation of Reversible Solid Oxide Cells Operated on Bio-Syngas

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Interdiffusion at electrochemical interfaces between yttria-stabilized zirconia and doped ceria

Cited by 5 publications

References 50 publications

Enhancement of Performance and Sulfur Tolerance of Ceria-Based Fuel Electrodes in Low Temperature SOFC

Enhancement of Performance and Sulfur Tolerance of Ceria-Based Fuel Electrodes in Low Temperature SOFC

Phase stability, redox-behavior and carbon-tolerance of Sr1−x(Ti0.3Fe0.7−yNiy)O3−δ with exsolved nanoparticles

Experimental Investigation of Naphthalene Induced Degradation of Reversible Solid Oxide Cells Operated on Bio-Syngas

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Product

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Phase stability, redox-behavior and carbon-tolerance of Sr_1−x(Ti_0.3Fe_0.7−yNi_y)O_3−δ with exsolved nanoparticles