The effect of gas compositions on the performance and durability of solid oxide electrolysis cells

Kim, Sun Dong; Seo, Doo Won; Dorai, Arun Kumar; Woo, Sang Kuk

doi:10.1016/j.ijhydene.2013.03.115

Cited by 44 publications

(23 citation statements)

References 19 publications

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“…An SOEC is essentially the same cell as SOFC which is operated in reverse current direction. However, when operating the SOEC at high electrolysis current density (above 1 A cm -2 ) or correspondingly high over-potential, severe degradation has been widely reported [17][18][19][20][21][22][23][24][25][26][27]. When comparing performance in fuel cell mode and electrolysis mode, an important difference is that heat evolution in the process.…”

Section: Introductionmentioning

confidence: 99%

Degradation in Solid Oxide Electrolysis Cells During Long Term Testing

et al. 2019

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In this work, we report a 4,400 h test of a state-of-the-art Ni-YSZ (yttria stabilized zirconia) electrode supported solid oxide electrolysis cell. The electrolysis test was carried out at 800°C, -1 A cm -2 with 10% H 2 + 90% H 2 O supplied to Ni-YSZ electrode compartment. Except for the first 250 h of fast initial degradation, the cell showed rather stable performance with a moderate degradation rate of around 25 mV per 1,000 h. The electrochemical impedance spectra (EIS) acquired during the test show that both serial resistance and electrode polarization resistance increased during the durability test. Further impedance analyzes show that both the LSCF (strontium and cobalt co-doped lanthanum ferrite)-CGO (gadolinium doped ceria) electrode and Ni-YSZ electrode degraded and the degradation was dominated by the Ni-YSZ electrode. Post mortem analysis on the Ni-YSZ electrode revealed loss of contact between Ni-Ni grains, Ni-YSZ grains and increased porosity inside the active layer. The microstructural changes were most severe at steam gas inlet and became less severe along the gas flow path. The present test results show that this type of cell can be used for early demonstration of solid oxide cell operation at electrolysis current densities around 1 A cm -2 .

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Section: Introductionmentioning

confidence: 99%

Degradation in Solid Oxide Electrolysis Cells During Long Term Testing

et al. 2019

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“…Moreover, high pressure stability is also a peculiar requirement for sealants of SOECs operating in pressurized environments, which is a promising application showing improved cell performance at high current density . Hence, the sealants for SOEC should be capable of working for >30 000 hours under the operating conditions of high pressure and applied thermal cycles . The sealants should also work effectively under oxidizing and reducing environment …”

Section: Introductionmentioning

confidence: 99%

Design and characterization of novel glass‐ceramic sealants for solid oxide electrolysis cell (SOEC) applications

Javed

Sabato

Herbrig

et al. 2018

Int J Applied Ceramic Tech

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In this work, three new glass-ceramic compositions are designed and characterized as sealant materials for solid oxide electrolysis cells (SOEC), having operating temperature of 850°C. The crystallization and the sintering behavior of the glasses are investigated by using differential thermal analysis (DTA) and heating stage microscopy (HSM) respectively. The glasses show glass transition temperatures of 715-740°C, while the coefficients of thermal expansion (CTE) of 9.3-10.3 9 10 À6 K À1 (200-500°C) are measured for the glass-ceramics, matching with the CTEs of the other cell components. The compatibility between the glassceramic sealants, the 3YSZ electrolyte and the Crofer22APU interconnect is examined by means of SEM and EDS, in the as-joined condition and after 1000 hours at 850°C in air. Compositional changes in the glass-ceramic sealants are reviewed and discussed with respect to the formed crystalline phases before and after the aging treatment at 850°C. K E Y W O R D S crystals/crystallization, Interfaces, SOEC, thermal expansion ---

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“…These values regarding electrode polarization performance are around 50% to the reported values with Ni–YSZ cathode for steam electrolysis. In one reported work, the resistance is 1.126 Ω cm 2 under similar conditions in flowing H 2 /Ar . However, the electrode resistance can be reaching above 1000 Ω cm 2 if H 2 is absent because of the oxidation from Ni to NiO …”

mentioning

confidence: 79%

Redox‐Reversible Iron Orthovanadate Cathode for Solid Oxide Steam Electrolyzer

Gan

Ruan

et al. 2015

Advanced Science

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A redox‐reversible iron orthovanadate cathode is demonstrated for a solid oxide electrolyser with up to 100% current efficiency for steam electrolysis. The iron catalyst is grown on spinel‐type electronic conductor FeV2O4 by in situ tailoring the reversible phase change of FeVO4 to Fe+FeV2O4 in a reducing atmosphere. Promising electrode performances have been obtained for a solid oxide steam electrolyser based on this composite cathode.

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The effect of gas compositions on the performance and durability of solid oxide electrolysis cells

Cited by 44 publications

References 19 publications

Degradation in Solid Oxide Electrolysis Cells During Long Term Testing

Degradation in Solid Oxide Electrolysis Cells During Long Term Testing

Design and characterization of novel glass‐ceramic sealants for solid oxide electrolysis cell (SOEC) applications

Redox‐Reversible Iron Orthovanadate Cathode for Solid Oxide Steam Electrolyzer

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