Sm0.5Sr0.5CoO3 cathodes for low-temperature SOFCs

Xia, Changrong; Rauch, William L.; Chen, Fanglin; Liu, Meilin

doi:10.1016/s0167-2738(02)00131-5

Cited by 626 publications

(284 citation statements)

References 17 publications

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“…LaSrGaO 4 and LaSrGa 3 O 7 phases again were present in small amount. The XRD scan of the composite SSC-SDC powder gave the expected peaks associated with SSC and SDC (20). There were LaSrGaO 4 and LaSrGa 3 O 7 precipitates detected when the composite cathode SSC-SDC/LSGMC was calcined on LSGM.…”

Section: Resultsmentioning

confidence: 97%

Electrochemical Investigation of LSGMC-Composite Cathodes on LSGM-Substrate

Do¹,

Guo²,

Lu³

et al. 2008

ECS Trans.

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16 Ω were measured for LSCF/LSGMC composite cathode on LSGM substrate at 800ºC in air. Low-frequency secondary arcs in the impedance spectra of LSCF/LSGMC cathode coupled with low current density and low cathode porosity suggested possible mass transfer limitations. The LSCF/LSGMC composite electrode performed best at 800ºC (0.11 A/cm 2 at 0.045 V overpotential) while the BSCF/LSGMC performed best at the lowest temperature investigated (0.1 A/cm 2 at 700ºC and 0.04 V overpotential).

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Section: Resultsmentioning

confidence: 97%

Electrochemical Investigation of LSGMC-Composite Cathodes on LSGM-Substrate

Do¹,

Guo²,

Lu³

et al. 2008

ECS Trans.

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“…Many perovskite oxides (e.g. SCFN and LSCF) have been studied and developed as the mixed ionic and electronic conductors (MIEC) that can provide the path for transferring both electrons and ions to improve the electrochemical performance of the IT-SOFCs cathode [7][8][9][10][11][12][13][14] . Moreover, recent studies have shown the potential of some perovskite related structures such as GdBaCo 2 O 5+δ and SmBaCo 2 O 5+x with layered and doubled structures, respectively, for operation at reduced temperatures due to their low activation energy.…”

Section: Research Objectives and Motivationmentioning

confidence: 99%

Microstructure Sensitive Design and Processing in Solid Oxide Electrolyzer Cell

Garmestani¹,

Herring²

2009

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SUMMARYThe aim of this study was to develop an inexpensive manufacturing process for deposition of functionally graded thin films of LSM oxides with porosity graded microstructures for use as IT-SOFCs cathode. The spray pyrolysis method was chosen as a low-temperature processing technique for deposition of porous LSM films onto dense YSZ substrates. The effort was directed toward the optimization of the processing conditions for deposition of high quality LSM films with variety of morphologies in the range of dense to porous microstructures. Results of optimization studies of spray parameters revealed that the substrate surface temperature is the most critical parameter influencing the roughness and morphology, porosity, cracking and crystallinity of the film. Physical and chemical properties of deposited thin films such as porosity, morphology, phase crystallinity and compositional homogeneity have shown to be extensively dependent on the preparation conditions. Detailed analysis of the film formation mechanisms have been discussed in this work. It is suggested that using volatile metal-organic precursors as in CVD would alter the film formation mechanism to MOCVD process in which films of high quality can be processed. Novel electrode microstructures currently include a graded microstructure wherein the large pores are made close to the surface in outer layers for maximum mass transport into the electrode structure and smaller pores and particles close to the electrolyte interface would create maximum number of active reaction sites. Taking the advantage of simplicity of spray pyrolysis technique combined with using metal-organic compounds, the conventional ultrasonic spray system was upgraded to a novel system whereby highly crystalline multiMicrostructure Sensitive Design for Materials in Solid Oxide Electrolyzer Cell, Garmestani vi layered porosity graded LSM cathode with columnar morphology with good electrical conductivity in the range of 500-700 °C was fabricated through a multi-step spray and via optimizing spray parameters. This achievement for the current graded LSM cathode would allow its use in IT-SOFCs.Microstructure Sensitive Design for Materials in Solid Oxide Electrolyzer Cell, Garmestani 7

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“…A 800ºC para o metano como combustível, a tensão foi constante a partir de uma corrente de 5 mA, não sendo possível a coleta de dados entre esta corrente e dados de circuito aberto. Essa célula de PaCOS unitária mostrou desempenho para a produção de energia elétrica comparativo a dados reportados na literatura [67]. Além disto, o gráfico de potência apresenta uma estimativa preliminar para o desempenho da célula utilizando hidrogênio e operando a 800ºC.…”

Section: Energia De Ligação Evunclassified

Preparação e avaliação de célula a combustível do tipo PaCOS unitária com ânodo a base de níquel e cobalto

Silva¹,

Alencar²,

Fiúza³

et al. 2007

Matéria (Rio J.)

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RESUMOUma célula a combustível do tipo PACOS unitária foi preparada e avaliada na geração de energia elétrica, utilizando metano ou hidrogênio como combustível. O ânodo da célula foi sintetizado a partir do eletro-catalisador desenvolvido e testado nesse trabalho (CATAC). O CATAC foi preparado pela mistura mecânica da zircônia estabilizada com ítria (YSZ) com os precursores metálicos (nitrato de níquel e cobalto, em sua forma hexahidratado), adicionando-se 25% de ácido cítrico à massa total da mistura e por fim calcinado a 800°C por quatro horas em ar. O catalisador foi caracterizado por fluorescência de raios X (XRF) e espectroscopia foto-eletrônica de raios X (XPS), a qual não indicou interação eletrônica entre o cobalto e níquel; o teor metálico do CATAC foi de aproximadamente 35% em massa. O CATAC foi testado para a geração de hidrogênio a partir da reforma a vapor do metano, mostrando boa produtividade de hidrogênio a partir de 600ºC. A estrutura do ânodo/eletrólito/cátodo foi preparada por prensagem de uma camada de CATAC misturado com grafite, uma camada de YSZ puro, e uma camada de óxido misto de lantânio, estrôncio e manganês (LSM) e grafite. O conjunto foi então prensado e sinterizado a 1380°C por quatro horas. Nas superfícies do ânodo e cátodo foram fixadas telas de platina, com o auxílio de tinta de platina, sendo o conjunto aquecido a 1100°C. Todo o sistema foi colado a um reator de alumina utilizando cola cerâmica. Microscopias por MEV da estrutura mostraram eletrólito denso e eletrodos porosos, com um conjunto adequadamente sinterizado. A célula unitária foi testada utilizando metano ou hidrogênio como combustível, a três temperaturas de operação. A tensão variou inversamente proporcional com a corrente, quando o desempenho foi medido a 850 ou 950ºC e hidrogênio, mas manteve-se constante acima de cinco mV a 800ºC com metano. A célula unitária mostrou um desempenho satisfatório na geração de eletricidade tanto com metano quanto com hidrogênio como combustíveis. Palavras chaves:Rede Cooperativa, pilha a combustível, óxido sólido, catalisador, níquel, cobalto, YSZ. Synthesis and Evaluation of Solid Oxide Fuel Cell (SOFC) with Anode based on Nickel and Cobalt ABSTRACTA unitary solid oxide fuel cell (SOFC) was prepared and evaluated for the electric energy generation, using methane and hydrogen as fuel. The cell anode was made with the electro-catalyst developed and characterized in this work (CATAC). CATAC was prepared by the mechanical mixture of zirconia stabilized with ytria (YSZ) and the metallic precursors (nickel and cobalt nitrate, hexahydrated), adding 25% of citric acid to the total mass, and finally calcined at 800°C for four hours in air. The catalyst was characterized by X-ray fluorescence (XRF) and X-ray photo-electronic spectroscopy (XPS), which did not indicate any electronic interaction between nickel and cobalt; CATAC metal content was approximately 35% in mass. CATAC was tested for the hydrogen generation from methane vapor reforming, showing good productivity starting at 600ºC. The ...

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Sm0.5Sr0.5CoO3 cathodes for low-temperature SOFCs

Cited by 626 publications

References 17 publications

Electrochemical Investigation of LSGMC-Composite Cathodes on LSGM-Substrate

Electrochemical Investigation of LSGMC-Composite Cathodes on LSGM-Substrate

Microstructure Sensitive Design and Processing in Solid Oxide Electrolyzer Cell

Preparação e avaliação de célula a combustível do tipo PaCOS unitária com ânodo a base de níquel e cobalto

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