Sol-Gel Thin-Film Electrolyte Anode-Supported SOFC – From Layer Development To Stack Testing

Menzler, Norbert H.; Feng, Han; Sebold, Doris; Fang, Qingping; Blum, Ludger; Buchkremer, Hans Peter

doi:10.1149/05701.0959ecst

Cited by 9 publications

(7 citation statements)

References 11 publications

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“…More detailed information about the ASC technology and Forschungszentrum Jülich F-design can be found elsewhere. [29][30][31][32] The stack's major components are listed in Table I.…”

Section: Methodsmentioning

confidence: 99%

Performance and Degradation of Solid Oxide Electrolysis Cells in Stack

Fang

Blum

Menzler

2015

J. Electrochem. Soc.

104

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A Solid Oxide Electrolysis (SOE) short stack consisting of anode-supported cells (ASCs in fuel cell mode) was assembled in J ÜLICH's F10-design. ASCs are based on Ni/8YSZ (8 mol-% yttria-stabilized zirconia) with an LSCF air electrode (La 0.58 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ ) and 8YSZ electrolyte. A gadolinium-doped ceria (GDC) (Ce 0.8 Gd 0.2 O 1.9 ) barrier layer was deposited between 8YSZ and LSCF by means of physical vapor deposition (PVD). The stack was mainly characterized in a furnace environment in both fuel cell and electrolysis modes, with 50% humidified H 2 at 700 and 800 • C. An endothermic long-term electrolysis operation was carried out at 800 • C with a current density of −0.5 Acm −2 and steam conversion rate of 50%. After 2300 h of operation, the stack showed an average voltage degradation rate of 0.7%/kh. Electrochemical impedance spectroscopy (EIS) and analysis of the distribution function of relaxation times (DRT) showed that the degradation was primarily due to the increase in ohmic resistance.

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“…More detailed information about the ASC technology and Forschungszentrum Jülich F-design can be found elsewhere. [29][30][31][32] The stack's major components are listed in Table I.…”

Section: Methodsmentioning

confidence: 99%

Performance and Degradation of Solid Oxide Electrolysis Cells in Stack

Fang

Blum

Menzler

2015

J. Electrochem. Soc.

104

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“…The sealing inside the stack was achieved by glass-ceramic on all bonding surfaces. Detailed descriptions of the cell and stack design and assembly can be found in [23][24][25][26][27]. Joining of the stack was performed for 100 h at 850 °C in the furnace with a load of 6 kN.…”

Section: Stack and Cell Designmentioning

confidence: 99%

Origin of Steam Contaminants and Degradation of Solid-Oxide Electrolysis Stacks

et al. 2022

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Two once-through steam generators and a combination of a steam generator and a gas preheater for supplying feed gases to solid-oxide electrolysis stacks were evaluated for their carryover characteristics of contaminants from the feed-water into the steam phase. The concentrations of various trace impurities in the steam were determined by sampling the steam condensates and screening them with inductively coupled plasma–mass spectrometry for 19 elements and liquid ion chromatography and continuous flow analysis for chloride and ammonium. Steam-soluble species such as boric acid undergo complete volatilization and transfer into the steam phase. During unstable evaporation in the steam generators an extensive physical carryover of alloying metal species was observed. At realistic operation conditions for steam electrolysis, the gas preheater caused a considerable release of silicon into the steam phase. Two stack experiments were performed with common preheater temperatures and showed largely increased cell voltage degradation at higher operation temperatures. The post-test chemical analysis of cell samples revealed significant concentrations of silicon in the samples that are regarded as primary cause for increased degradation. These findings could partially explain the wide spread of degradation rates reported for solid-oxide steam electrolysis experiments.

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“…The sealing inside the stack was ensured by glass-ceramic on all bonding surfaces and the external sealing by flat mica gaskets. Detailed descriptions of the cell and stack design and assembly can be found in [12][13][14][15]. The stack temperatures were monitored by nine thermocouples inserted about 40 mm-deep into the stack.…”

Section: Stack and Cell Designmentioning

confidence: 99%

System-Supporting Operation of Solid-Oxide Electrolysis Stacks

et al. 2021

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Flexible, system-oriented operating strategies are becoming increasingly important in terms of achieving a climate-neutral energy system transformation. Solid-oxide electrolysis (SOEC) can play an important role in the production of green synthesis gas from renewable energy in the future. Therefore, it is important to investigate the extent to which SOEC can be used flexibly and which feedback effects and constraints must be taken into account. In this study, we derived a specific load profile from an energy turnaround scenario that supports the energy system. SOEC short-stacks were operated and we investigated the impact that the load profile has on electrical stack performance and stack degradation as well as the product gas composition by means of Fourier-transform infrared spectroscopy. The stacks could follow the grid-related requirement profiles of secondary control power and minute reserves very well with transition times of less than two minutes per 25% of relative power. Only short-term disturbances of the H2/CO ratio were observed during transitions due to the adjustment of feed gases. No elevated degradation effects resulting from flexible operation were apparent over 1300 h, although other causes of degradation were present.

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Sol-Gel Thin-Film Electrolyte Anode-Supported SOFC – From Layer Development To Stack Testing

Cited by 9 publications

References 11 publications

Performance and Degradation of Solid Oxide Electrolysis Cells in Stack

Performance and Degradation of Solid Oxide Electrolysis Cells in Stack

Origin of Steam Contaminants and Degradation of Solid-Oxide Electrolysis Stacks

System-Supporting Operation of Solid-Oxide Electrolysis Stacks

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