Effect of electric load and dual atmosphere on the properties of an alkali containing diopside-based glass sealant for solid oxide cells

Sabato, Antonio Gianfranco; Rost, Axel; Schilm, Jochen; Kusnezoff, Mihails; Salvo, Milena; Chrysanthou, A.; Smeacetto, Federico

doi:10.1016/j.jpowsour.2019.01.051

Cited by 34 publications

(13 citation statements)

References 47 publications

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“…On the other hand, the HJ4 and GC2 compositions were designed for a SOC working temperature of 850 • C (with a specific focus on solid oxide electrolysis cells -SOEC or reversible SOCs) by intentionally avoiding the use of alkali metal oxides; in fact, alkali-containing glass sealants can be negatively affected by high voltage application (1-1.7 V) and the simultaneous contact with chromia-forming steels. 17 The GC2 glass contained BaO as the main modifier, as it improves the wettability of the parent glass on stainless steel and the CTE of the derived glass-ceramic. 18 Moreover, BaO has a tendency to form the BaSi 2 O 5 phase, with a CTE in the range of 11-14 × 10 −6 K −1 , which is required to obtain a glass-ceramic with suitable CTE for SOCs.…”

Section: Resultsmentioning

confidence: 99%

Glass‐to‐metal seals for solid oxide cells at the Politecnico di Torino, an overview

Smeacetto

Chrysanthou

Sabato

et al. 2021

Int J Applied Ceramic Tech

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A summary and update of the research on the design, process, and testing of glass and glass-ceramic to metal seals for solid oxide cells (SOC) conducted during the last 13 years at the Politecnico di Torino, Italy, within our research group and with several international collaborations, is presented and discussed.Glass and glass-ceramic-based materials play a key role in SOC performance and durability as well as in the sealing and joining of metallic interconnects. The sinter-crystallization method is a powerful technique that is used to obtain dense and reliable glass-ceramics capable of providing hermetic joining and seals. The issues, learned from our experience, that have an impact on the lifetime behavior of glass and glass-ceramic to metal seals are briefly reviewed in terms of challenges and working conditions. The mechanical characterization of glassto-metal seal materials has a crucial impact on the overall performance, as the metal-glass interface plays a key role on the final joining strength and reliability.Several glass compositions are presented along with results on their characterization and behavior as joining materials for metallic interconnects, with a focus on their potential use as SOC seals.

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Section: Resultsmentioning

confidence: 99%

Glass‐to‐metal seals for solid oxide cells at the Politecnico di Torino, an overview

Smeacetto

Chrysanthou

Sabato

et al. 2021

Int J Applied Ceramic Tech

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“…Moreover, the microstructure and level of closed porosity at the fuel side is also similar to that of the air side. In a previous study, Sabato et al [21] observed the formation of detrimental reaction between an alkali-containing glass-ceramic and Crofer22APU in similar operating conditions (dual atmosphere, 800 • C under applied voltage). This study highlighted the strong importance of the region exposed to air and the role played by the applied voltage in the presence of alkali metal oxide in the glass.…”

Section: Electrical Characterization In Dual Atmosphere and Post Mortem Analysismentioning

confidence: 88%

Glass-Ceramic Sealants for SOEC: Thermal Characterization and Electrical Resistivity in Dual Atmosphere

et al. 2020

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A Ba-based glass-ceramic sealant is designed and tested for solid oxide electrolysis cell (SOEC) applications. A suitable SiO2/BaO ratio is chosen in order to obtain BaSi2O5 crystalline phase and subsequently favorable thermo-mechanical properties of the glass-ceramic sealant. The glass is analyzed in terms of thermal, thermo-mechanical, chemical, and electrical behavior. Crofer22APU-sealant-Crofer22APU joined samples are tested for 2000 h at 850 °C in a dual atmosphere test rig having reducing atmosphere of H2:H2O 50/50 (mol%) and under the applied voltage of 1.6 V. In order to simulate the SOEC dynamic working conditions, thermal cycles are performed during the long-term electrical resistivity test. The glass-ceramic shows promising behavior in terms of high density, suitable CTE, and stable electrical resistivity (106–107 Ω cm) under SOEC conditions. The SEM-EDS post mortem analysis confirms excellent chemical and thermo-mechanical compatibility of the glass-ceramic with Crofer22APU.

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“…Alkali-containing glasses and glass-ceramics have been reported for sealing purposes in SOFCs. 18,[120][121][122][123][124][125][126][127] Neilson et al 24 focused on the optimization of composite glass sealants for a longer duration. Sodium alumina-silicate (NAS) glasses (T g = 515 C) with the MgO filler are used for their chemical interaction with ferritic interconnect steels, Crofer 22APU, and Fe22Cr alloy.…”

Section: Alkali-containing Glass Sealantmentioning

confidence: 99%

“…Alkali‐containing glasses and glass‐ceramics have been reported for sealing purposes in SOFCs 18,120–127 . Neilson et al 24 focused on the optimization of composite glass sealants for a longer duration.…”

Section: Effect Of Different Glass Constituents On Sealing Propertiesmentioning

confidence: 99%

Review on silicate and borosilicate‐based glass sealants and their interaction with components of solid oxide fuel cell

Singh

Walia

2021

Intl J of Energy Research

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A lot of research is going on in the field of glass science to commercialize solid oxide fuel cells (SOFCs). Still, it is a big challenge to develop appropriate glass sealants for a longer duration and sustaining in the operating conditions of this power source. Mixed alkaline earth metal oxides containing silicate or borosilicate glasses could be most suitable as a rigid glass sealant in SOFCs in comparison with borate-and phosphate-based glass sealants. In this review article, the need for the sealants in the planar design of SOFCs, the effect of different modifiers, and intermediate oxides on sealing properties of glasses and glassceramics, particularly, silicate-and borosilicate-based glass sealants have been reviewed. Interaction study of glass sealants with common electrolytes and interconnect materials is also overviewed in this article. In addition to these, future perspectives and suggestions for suitable seal development are also proposed. Novelty statementThis review article is related to the glass sealants for a highly efficient and environment friendly solid oxide fuel cell energy conversion device. Still, it is a big challenge to develop an appropriate sealant to commercialize this energy device. This article provides the researchers with not only progress and latest development in the field of glass sealants but also suggestion and future prospects to develop the sealants.

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Effect of electric load and dual atmosphere on the properties of an alkali containing diopside-based glass sealant for solid oxide cells

Cited by 34 publications

References 47 publications

Glass‐to‐metal seals for solid oxide cells at the Politecnico di Torino, an overview

Glass‐to‐metal seals for solid oxide cells at the Politecnico di Torino, an overview

Glass-Ceramic Sealants for SOEC: Thermal Characterization and Electrical Resistivity in Dual Atmosphere

Review on silicate and borosilicate‐based glass sealants and their interaction with components of solid oxide fuel cell

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