Oxygen-ion conducting electrolyte materials for solid oxide fuel cells

Badwal, S. P. S.; Ciacchi, F.T.

doi:10.1007/bf02375543

Cited by 160 publications

(165 citation statements)

References 92 publications

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“…Several materials have been proposed as electrolytes in IT-SOFC [13][14][15][16]. Basing on literature data [17,18] as well as own studies [19] tetragonal zirconia: ZrO 2 +3 mol % Y 2 O 3 (3YSZ) can be promising solid electrolyte in IT-SOFC.…”

Section: Introductionmentioning

confidence: 99%

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Effect Of The Gadolinium Oxide Addition On The Electrical Properties Of Tetragonal Zirconium Dioxide

Cyran¹,

Wyrwa²,

Drożdż³

et al. 2015

Archives of Metallurgy and Materials

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The aim of this work was examination of gadolinium-doped 3YSZ electrical and structural properties. Such materials may be used as electrolytes in intermediate temperature solid oxide fuel cells (IT-SOFC). First step of the research was synthesis of 3YSZ with different contents of gadolinium ( 0.25; 0.5; 1.0 at %). Prepared materials were characterized by high porosity. No effect of gadolinium addition on grain size was observed. The experimentally determined values of grain interiors electrical conductivities for gadolinium doped samples are comparable to grain interior conductivities of gadolinium free tetragonal zirconia. On the other hand, a clear effect of gadolinium addition on electrical conductivity of grain boundaries was observed. It was found that 3YSZ containing 0.25 at. % Gd was the most promising from the investigated materials as a solid electrolyte for IT SOFC.Keywords: Gadolinium (III) oxide, tetragonal zirconia, electrical properties, grain boundary conductivity Celem pracy było zbadanie strukturalnych i elektrycznych właściwości dwutlenku cyrkonu stabilizowanego 3% mol. tlenkiem itru (3YSZ) z dodatkiem gadolinu. Tego typu materiał może znaleźć zastosowanie jako elektrolit w średniotempe-raturowych stało-tlenkowych ogniwach paliwowych (IT-SOFC). Pierwszym etapem badań była synteza 3YSZ z różną ilością wprowadzonego gadolinu (0.25; 0.5; 1.0 at %). Otrzymane materiały charakteryzowały się wysoką porowatością. Nie zaobserwowano wpływu dodatku gadolinu na wielkość ziaren. Wyznaczone eksperymentalnie wartości przewodnictwa objętości ziaren są porównywalne z wartością przewodnictwa objętości ziaren wykazywanego przez czysty 3YSZ (bez dodatku gadolinu). Z drugiej strony, zaobserwowano znaczny wpływ dodatku gadolinu na przewodnictwo po granicach ziaren. Stwierdzono również, że 3YSZ zawierający 0.25% at. gadolinu był najbardziej obiecującym z badanych materiałów pod kątem zastosowania jako elektrolit w IT -SOFC.

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Section: Introductionmentioning

confidence: 99%

“…Many efforts have been made to reduce the blocking effect in tetragonal zirconia. It was found that the alumina added to the zirconia material acts as the silicon scavenger [14,19,23].…”

Section: Introductionmentioning

confidence: 99%

Effect Of The Gadolinium Oxide Addition On The Electrical Properties Of Tetragonal Zirconium Dioxide

Cyran¹,

Wyrwa²,

Drożdż³

et al. 2015

Archives of Metallurgy and Materials

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“…Entretanto, poucos óxidos podem satisfazer os rigorosos requisitos deste componente, sendo que os possíveis materiais são a cromita de ítrio (YCrO 3 ) e a cromita de lantânio (LaCrO 3 ) [28]. Tabela III -Materiais empregados na fabricação de eletrólitos usados em SOFCs [23][24][25].…”

Section: Interconectoresunclassified

Materiais usados na constituição dos principais componentes de células a combustível de óxido sólido

Nascimento

Mohallem

2009

Cerâmica

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ResumoAs células a combustível de óxido sólido (SOFC) são dispositivos capazes de gerar energia elétrica com alta eficiência e baixa emissão de poluentes. As altas temperaturas de operação dessas células (600 a 1000 ºC) são benéficas no sentido de possibilitar a reforma in situ do combustível utilizado, bem como sua aplicação em sistemas de co-geração de energia, aumentando sua eficiência teórica total que pode chegar entre 80 e 85%. Entretanto, essas altas temperaturas, o contato direto entre materiais de constituições químicas diferentes e a utilização de gases redutores e oxidantes, são alguns dos fatores que impõem severas restrições aos materiais usados na preparação de seus principais componentes. O presente artigo tem como objetivo revisar o desenvolvimento do estado da arte, com relação aos materiais de ânodo, cátodo, eletrólito, interconectores e selantes, usados em SOFCs. Os requisitos necessários para o bom funcionamento de cada componente e os materiais que melhor se adequam aos mesmos são descritos. As vantagens e desvantagens dos principais materiais encontrados na literatura são também comentadas e comparadas. Palavras-chave: células a combustível de óxido sólido, ânodo, cátodo, eletrólito. Abstract Solid oxide fuel cells (SOFC

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“…Oxygen-ion conducting ceramic membrane materials (pure ionic or mixed ionic/electronic conductors) have the ability to selectively transport oxygen in the form of an ionic flux at high temperatures producing O 2 of extremely high purity [8,9,43]. Dense membranes constructed from such materials are highly selective to oxygen with a separation factor approaching infinity.…”

Section: Oxygen Separation Membranesmentioning

confidence: 99%

Materials for separation membranes in hydrogen and oxygen production and future power generation

Phair

Badwal²

2006

Science and Technology of Advanced Materials

111

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Future fossil fuel power generation is likely to include technologies which increase process efficiency and reduce its impact on the environment, for example, CO 2 sequestration. Some of the key technologies identified for clean coal and natural gas combustion to produce power or hydrogen or both include O 2 generation/separation, H 2 and CO 2 separation. Hydrogen is considered as a potentially excellent substitute for transport fuels due to the concern over dwindling oil reserves and global warming. This paper discusses various separation processes that may be used in the industrial production of hydrogen from fossil fuels, with an emphasis on membrane separation technologies. Membrane separation has the advantage over other separation methods in that it is simple and potentially less energy intensive. Depending on the particular separation process utilised, however, the membrane materials can differ substantially. The materials used for H 2 , O 2 and CO 2 separation are discussed and the major similarities and differences between the membranes highlighted. Critical design aspects of the membrane such as multiple phase design, nano-structure control, the need for surface layers and fabrication processes are also reviewed as they represent the areas where most research and development effort is likely to be directed in the future. r

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Oxygen-ion conducting electrolyte materials for solid oxide fuel cells

Cited by 160 publications

References 92 publications

Effect Of The Gadolinium Oxide Addition On The Electrical Properties Of Tetragonal Zirconium Dioxide

Effect Of The Gadolinium Oxide Addition On The Electrical Properties Of Tetragonal Zirconium Dioxide

Materiais usados na constituição dos principais componentes de células a combustível de óxido sólido

Materials for separation membranes in hydrogen and oxygen production and future power generation

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