Contemporary Approaches to Planar SOFC Stack Design and Performance Characterization

Naumovich, E.N.; Błesznowski, Marcin; Żurawska, Agnieszka

doi:10.1007/978-3-319-75602-8_3

Cited by 2 publications

(2 citation statements)

References 129 publications

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“…In P‐SOFC stacking, sealing materials are applied at the edges of every component 23 . Hence, sealing plays a key role in avoiding any leakages of either air or fuel from cathode and anode chambers, respectively.…”

Section: Need Of the Sealsmentioning

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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Section: Need Of the Sealsmentioning

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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“…For modern planar SOCs operated below 800 °C, prefabricated high-temperature oxidation-resistant chromia former alloy sheets are the IC of choice and mechanical support of the stack. − For tubular SOCs, however, ceramic films directly deposited on the electrode support have been used as ICs. For example, Siemens-Westinghouse cathode-supported and Atrex (now Special Power Sources or SPS) anode-supported tubular SOCs employ Ca-doped LaCrO 3 (LCC) thin-film supported on the electrode substrate as the IC layer. − From a material perspective, LCC has a reasonably high electrical conductivity in both oxidizing and reducing atmospheres and good thermal expansion match to electrolyte and electrodes. − However, the major challenges to LCC-based ICs are their poor sinterability and gradual development of porosity due to Cr volatilization during extended operations. The fundamental reason for LCC’s poor sinterability is rooted in the Cr vaporization (Cr 6+ ) and Cr 2 O 3 recondensation mechanism occurring at the interparticle neck during the initial sintering stage, thus inhibiting the grain growth from achieving dense body. , To overcome the difficulty of sintering, both Siemens-Westinghouse and Atrex (SPS) have adopted atmospheric plasma spray (APS) technique to deposit IC films, but at an increased manufacturing cost. , Another issue with LCC IC is its high oxygen permeability due to the presence of oxygen vacancies created by the Ca-acceptor doping, giving rise to fuel loss and lowered efficiency. , …”

Section: Introductionmentioning

confidence: 99%

Dense and Low Oxygen Permeability Bilayer Ceramic Interconnect for Tubular Anode-Support Solid Oxide Cells

Qiu

Jia

et al. 2020

ACS Appl. Energy Mater.

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LaCrO 3 -based ceramic interconnects (ICs) are currently employed in tubular solid oxide cells (SOCs), but they are facing challenges in manufacturability, durability, and cost, primarily due to Cr volatilization issues. Development of Cr-free, easy-to-manufacture, and low-cost ceramic ICs are, therefore, highly desirable for tubular SOCs. Here we report a systematic study on the chemical and physical properties of Cr-free, Y-and Nb-doped SrTiO 3−δ (Sr 1−x Y x Ti 1−y Nb y O 3 , SYTN, 0 ≤ x, y ≤ 0.1) as a ceramic IC. While similar systems have been studied in the literature, our study has focused on optimizing SYTN compositions, examining chemical compatibility between SYTN and anode substrate, fabricating bilayer structure, cosintering it with anode substrate, and testing its performance under practical oxidizing−reducing dual atmospheres. The results show that SYTN(Y 0.08 Nb 0.02 ) is the best composition as an IC since it exhibits high electrical conductivity and can be cosintered with Ni-YSZ anode substrate into a dense microstructure without any chemical reactions. A first-principles theoretical study reveals that Yand Nb-doping transforms semiconducting SrTiO 3 into itinerant large-polarons metal, confirming the high electrical conductivity. A bilayer IC consisting of La 0.8 Sr 0.2 MnO 3−δ (LSM) top-layer and SYTN(Y 0.08 Nb 0.02 ) underlayer cosintered on the anode substrate is also demonstrated with dense microstructure, low area specific resistance and negligible oxygen permeability. Overall, the cosintered bilayer ceramic IC is a promising candidate for next-generation durable, and low-cost tubular SOCs.

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Contemporary Approaches to Planar SOFC Stack Design and Performance Characterization

Cited by 2 publications

References 129 publications

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

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

Dense and Low Oxygen Permeability Bilayer Ceramic Interconnect for Tubular Anode-Support Solid Oxide Cells

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