Call attention to using DRT and EIS to quantify the contributions of solid oxide cell components to the total impedance

Wang, Yudong; Marchetti, Barbara; Zhou, Xiao‐Dong

doi:10.1016/j.ijhydene.2022.08.093

Cited by 26 publications

(6 citation statements)

References 29 publications

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“…It is important All the SOEC spectra demonstrated three groups of peaks: (1) at τ ≈ 10 µs, triad (2)-( 4) at τ = 0.1-10 ms, and one or two peaks ( 5) and ( 6) at τ > 0.05 s. When oxygen was used as the sweep gas, peaks (1)-( 4) grew with time, and the ohmic resistance also developed systematically (Figure 6B,C and Figure 7). Such behavior may be considered as evidence for the delamination of the anode, which also does not contradict the decrease of peak ( 5), attributed to diffusion transport in the porosity of the electrodes [22]. Nitrogen as an ASG did not provoke sufficient degradation, with the exception of growth of the peak (1) and redistribution of the intensity in the triad (Figure 8).…”

Section: Degradation Experimentsmentioning

confidence: 84%

“…While the most prominent peak (5) demonstrated mixed reaction, peak (4) likely is associated with the cathode, and low-τ effects in (1) and ( 2) do not demonstrate a clear correlation with either ASG or CFG. In general, the "sharing" of the relaxation time constants between electrodes is a known phenomenon [22]. Vague "slow" effects, labeled as (6), likely should be considered as artifacts, related to the operation of the steam generator, which can be observed on raw electrochemical data (See Supplementary Materials, Figures S3-S5).…”

Section: Reference Performance Of the Cellsmentioning

confidence: 99%

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Impact of Sweep Gas on the Degradation of an La0.6Sr0.4Co0.8Fe0.8O3 Anode in a Solid Oxide Electrolysis Cell

Wierzbicki,

Jagielski,

Naumovich

et al. 2024

Energies

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The degradation of solid oxide electrolysis (SOE) cells with different anode sweep gases was studied in 1000 h-long measurements in order to investigate the impact of sweep gas composition on cell performance. Cathode-supported electrolysis cells with an La0.6Sr0.4Co0.2Fe0.8O3 air electrode (active area of 4 × 4 cm2) were tested under a constant current (−0.25 A/cm2) in the electrolysis mode while supplying the cathode side with 70% H2O–30% H2 mixtures at 800 °C and using oxygen, nitrogen, and steam as sweep gases. It was demonstrated that the degradation of the anode in steam conditions resulted in more than a 2-fold increase in both, polarization and ohmic resistance (from 0.20–0.25 to 0.6–0.65 Ω cm2 compared to relatively stable values of 0.15–0.2 Ω cm2 for N2), as a consequence of the phase decomposition. Strontium played an important role in steam-induced degradation, migrating from the volume of the electrode layer to the surface of the electrolyte. As a result, the Sr-enriched layer demonstrated susceptibility to Cr poisoning. The cell purged with N2 demonstrated enhanced performance, while the use of oxygen led to degradation originating from the well-described delamination process. DRT analysis demonstrated some similarity of the spectra for steam and N2, namely the presence of a slow process at τ≈0.5 s, which might be associated with hindered oxygen transport due to point defect association in the perovskite structure. The results of this study showed that Sr-containing materials likely cannot be used as an SOE anode in high humidity conditions.

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Section: Degradation Experimentsmentioning

confidence: 84%

Section: Reference Performance Of the Cellsmentioning

confidence: 99%

Impact of Sweep Gas on the Degradation of an La0.6Sr0.4Co0.8Fe0.8O3 Anode in a Solid Oxide Electrolysis Cell

Wierzbicki,

Jagielski,

Naumovich

et al. 2024

Energies

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“…36,37 The P4 (>1 kHz) and P5 (>10 kHz) are related to ionic transport in the anode and charge transfer processes, respectively. 31,36,38 From the DRT plot in Fig. 6, the main cause of the improved SOFC performance is the polarization resistance reduction in the cathode processes (P1).…”

Section: Resultsmentioning

confidence: 99%

Solid Oxide Fuel Cells with 3D Inkjet Printing Modified LSM-YSZ Interface

Jenkins,

Tian,

Dou

et al. 2024

ECS J. Solid State Sci. Technol.

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In this study, pillar shaped yttria-stabilized zirconia (YSZ) 3D microstructures with ~60 to 90 m diameter and 12 to 20 m height are fabricated by 3D inkjet printing to improve the topology of the electrolyte/cathode interface. The microstructures increase the surface area of the cell by ~ 2.4% to 4.0% and enhance the connection between the dense YSZ electrolyte and mixed YSZ-lanthanum strontium manganite (LSM) cathode. The morphology and microstructure of the YSZ interface are characterized with scanning electron microscopy. Polarization curves confirm that the power density improves by 47% to 107% at 0.55V, depending on the dimensions of the microstructures, in comparison to a flat interface. The non-linear improvement in power density with the size of microstructures is confirmed by calculating the uncertainty with repeated tests. Based on electrochemical impedance spectroscopy and distribution of relaxation times analysis, the performance improvement is attributed to changes in the oxygen surface exchange kinetics and O2- diffusivity in the cathode.

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“…The associated characteristic peaks are related to different electrode processes: the P1 peak (10 4 -10 5 Hz) is associated with charge transfer reactions and ion transport processes; 24,25 the P2 peak is related to the hydrogen evolution reaction at the fuel electrode corresponding to the characteristic frequency of 10 3 -10 4 Hz; 26,27 the P3 peak typically found in the 10 2 -10 3 Hz range is inuenced by the oxygen evolution reaction at the air electrode; 28,29 the P4 peak at around 10 1 -10 2 Hz represents gas diffusion in the porous Ni/YSZ fuel electrode; 30 and the P5 peak corresponding to 10 0 -10 1 Hz is associated with gas diffusion in the fuel channel. 31,32 The content of seawater steam in the inlet of the fuel electrode mainly affects the electrochemical reaction at the TPB of the fuel electrode, which is manifested by the P2 peak in the DRT diagrams. Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of the steam/hydrogen ratio on the performance of flat-tube solid oxide electrolysis cells for seawater

Pan

et al. 2023

Sustainable Energy Fuels

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Call attention to using DRT and EIS to quantify the contributions of solid oxide cell components to the total impedance

Cited by 26 publications

References 29 publications

Impact of Sweep Gas on the Degradation of an La0.6Sr0.4Co0.8Fe0.8O3 Anode in a Solid Oxide Electrolysis Cell

Impact of Sweep Gas on the Degradation of an La0.6Sr0.4Co0.8Fe0.8O3 Anode in a Solid Oxide Electrolysis Cell

Solid Oxide Fuel Cells with 3D Inkjet Printing Modified LSM-YSZ Interface

Effect of the steam/hydrogen ratio on the performance of flat-tube solid oxide electrolysis cells for seawater

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