Optimization of Solid Oxide Cells and Stacks for Reversible Operation

Ploner, Alexandra; Pylypko, Sergii; Iorio, Stéphane Di; Cubizolles, Géraud; Mougin, Julie

doi:10.1149/09101.2517ecst

Cited by 14 publications

(23 citation statements)

References 6 publications

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“…2 . in Figure2(previously reported in[1]). From Figure2it is evident that operating in constant SOFC mode only leads to limited degradation (27 mV/kh and 69 mV/kh for ALD and RND14 respectively).…”

supporting

confidence: 69%

“…Figure 2: Durability single cell test in load cycling mode from start of test is shown, previously reported in [1]. Test operated at 700 C, 80% FU, 0.6 A/cm 2 and -1.2 A/cm 2 , respectively in SOFC and SOEC mode.…”

Section: Resultsmentioning

confidence: 88%

“…Air was purged to the oxygen electrode. Only initial performance at OCV was reported in [1]. The area specific resistances (ASR) of the cells are given in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…That is to say, one system optimized to operate either in electrolysis mode (SOEC) to store excess electricity to produce H 2 , or in fuel cell mode (SOFC) when energy needs exceed local production, to produce electricity and heat again from H 2 or any other fuel locally available. Firstly, work focused on optimization of the different layers constituting the single SOC cell to reach high initial performance applying state-of-the-art materials as previously reported [1]. Secondly, the initially highest performing cells were selected for long-term reversible SOFC/SOEC single cell tests.…”

mentioning

confidence: 99%

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Test and characterization of reversible solid oxide cells and stacks for innovative renewable energy storage

Ploner

Pylypko²,

Cubizolles

et al. 2021

Fuel Cells

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This work aims at developing an innovative renewable energy storage solution, based on reversible Solid Oxide Cell (rSOC) technology. That is to say, one system optimized to operate either in electrolysis mode (SOEC) to store excess electricity to produce H 2 , or in fuel cell mode (SOFC) when energy needs exceed local production, to produce electricity and heat again from H 2 or any other fuel locally available. Firstly, work focused on optimization of the different layers constituting the single SOC cell to reach high initial performance applying state-of-the-art materials as previously reported [1]. Secondly, the initially highest performing cells were selected for long-term reversible SOFC/SOEC single cell tests. Thirdly, these cells were integrated in a stack design optimized for reversible operation at high degrees of H 2 and H 2 O utilization. The long-term single cell tests showed significant degradation in galvanostatic test periods during electrolysis but not in fuel cell mode prior to starting the reversible test operation while the degradation diminished during the subsequent rSOC operation of the cells operating at 700 C, +0.6 and -1.2 A/cm 2 in SOFC and SOEC modes respectively, at fuel utilization (FU) up to 80% in both modes. Electrochemical impedance spectroscopy analyses and post-mortem SEM investigations of tested single cells reveal that the fuel electrodes degraded significantly during the longterm single cell tests. Furthermore, long-term stack tests were conducted on 5-cell stacks, integrating both reference cells and optimised cells. The long-term stack tests were conducted applying different switches between SOFC and SOEC modes. Initially long duration tests (100h each mode) were performed in a mixture of 50% H 2 O and 50% H 2 to see the effect of the polarisation only. The alternating cycle SOEC/SOFC was repeated over a 1800 h testing period. Then stack switched daily from SOEC mode

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supporting

confidence: 69%

Section: Resultsmentioning

confidence: 88%

“…Air was purged to the oxygen electrode. Only initial performance at OCV was reported in [1]. The area specific resistances (ASR) of the cells are given in Table 1.…”

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Test and characterization of reversible solid oxide cells and stacks for innovative renewable energy storage

Ploner

Pylypko²,

Cubizolles

et al. 2021

Fuel Cells

Self Cite

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“…For less demanding applications, oxygen electrodes based on abundant Sr-doped LaMnO3 (LSM) may be used, while higher-performing applications require electrodes based on mixed conductors, such as lanthanum-strontium-ferrite-cobaltite (LSCF) or lanthanum-strontium-cobaltite (LSC) (22). Thin (0.1-5 µm) layers of gadolinia-doped ceria (CGO) are commonly used to prevent reaction between oxygen electrode materials and YSZ (23).…”

Section: Technology Based On Abundant Raw Materialsmentioning

confidence: 99%

Recent advances in solid oxide cell technology for electrolysis

Hauch

Küngas

Blennow

et al. 2020

Science

743

397

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In a world powered by intermittent renewable energy, electrolyzers will play a central role in converting electrical energy into chemical energy, thereby decoupling the production of transport fuels and chemicals from today’s fossil resources and decreasing the reliance on bioenergy. Solid oxide electrolysis cells (SOECs) offer two major advantages over alternative electrolysis technologies. First, their high operating temperatures result in favorable thermodynamics and reaction kinetics, enabling unrivaled conversion efficiencies. Second, SOECs can be thermally integrated with downstream chemical syntheses, such as the production of methanol, dimethyl ether, synthetic fuels, or ammonia. SOEC technology has witnessed tremendous improvements during the past 10 to 15 years and is approaching maturity, driven by advances at the cell, stack, and system levels.

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Solid oxide electrolysis stack development and upscaling

Di Iorio,

Monnet,

Palcoux

et al. 2023

Fuel Cells

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Solid oxide electrolysis is considered an efficient technology to produce hydrogen. To deploy electrolysers at the GW scale, an increase in the individual component size (cells and stacks in particular) is required. The integration of larger cells (200 cm2 active area) into 25‐cell stacks has been successfully performed. Performances were in the range of –0.8 to –0.9 A cm−2 at 1.3 V at 700°C. The number of cells has also been increased to 50 and 75 cells. For this latter 75‐cell stack, the assembly of three 25‐cell substacks was considered. Good gastightness and high performances were achieved, although connections between substacks add a serial resistance that affects the stack total performances. Nevertheless, a current density of more than –0.8 A cm−2 was obtained at 1.3 V and 700°C, consistent with individual substack performances. Finally, a stack made of 50 200 cm2 cells has been assembled. Although a stack deformation was visible due to individual component thickness scattering, a good gastighness was achieved and a current density of –0.9 A cm−2 at 1.3 V and 700°C was measured. The low voltage scattering highlighted a good homogeneity of the fluidic distribution and of the electrical contacts within the stack.

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Optimization of Solid Oxide Cells and Stacks for Reversible Operation

Cited by 14 publications

References 6 publications

Test and characterization of reversible solid oxide cells and stacks for innovative renewable energy storage

Test and characterization of reversible solid oxide cells and stacks for innovative renewable energy storage

Recent advances in solid oxide cell technology for electrolysis

Solid oxide electrolysis stack development and upscaling

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