Composite (La, Sr)MnO3–YSZ cathode for SOFC

Suzuki, Toshio; Awano, Masanobu; Jasiński, Piotr; Petrovsky, Vladimir; Anderson, Harlan U.

doi:10.1016/j.ssi.2005.12.016

Cited by 99 publications

(60 citation statements)

References 12 publications

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“…As the result of much higher surface area for oxygen exchange, the effect of rate determining surface exchange kinetics can be limited. Canales-Vazquez et al [33] [34][35][36], LNF cathode [37] and LSM-YSZ composites [38]. All of these materials exhibit much higher electronic conductivities, so results obtained for STFs are interesting.…”

Section: Resultsmentioning

confidence: 96%

Structural and electrical properties of Sr(Ti, Fe)O3-δ materials for SOFC cathodes

et al. 2012

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Doped strontium titanates are very versatile materials. Iron doped SrTiO 3 can be used, for example, as a material for resistive gas sensors and fuel cell electrodes. In this paper, two compositions based on Fe doped SrTiO 3 were studied as possible candidates for cathode application in SOFCs. Namely, SrTi 0.65 Fe 0.35 O 3 and SrTi 0.50 Fe 0.50 O 3 were examined. A chemical reactivity between electrode and YSZ electrolyte material was investigated, since Sr containing cathode materials in contact with YSZ electrolyte are prone to form insulating phases. Electrical conductivity of bulk samples showed relatively low total conductivities of 0.4 S cm −1 and~2 S cm −1 for STF35 and STF50 respectively. Suitability for cathode application was studied by Electrochemical Impedance Spectroscopy in a symmetrical electrode configuration. Area specific resistance (ASR) was determined in the temperature range from 600°C to 800°C. At 790°C samples show polarization ASR of approximately 0.1Ω cm 2 . It can be expected that further reduction of electrode ASR can be obtained by introduction of ceria barrier layer and tailoring of the electrode microstructure.

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Section: Resultsmentioning

confidence: 96%

Structural and electrical properties of Sr(Ti, Fe)O3-δ materials for SOFC cathodes

et al. 2012

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“…Fabrication of composite cathodes has also demonstrated to be an effective way of increasing triple phase boundaries (TPB) between cathode, gas and the electrolyte. LSM-YSZ and LSM-CGO are well-known composite cathodes that have been extensively studied [19][20][21][22][23][24] .…”

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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“…Vários estudos têm demonstrado que para aumentar as condutividades eletrônica e iônica, principalmente a condutividade iônica, bem como elevar a atividade catalítica da reação de redução do O 2 , é adequado melhorar o desempenho da CaCOSTA utilizando como camada intermediária ou principal, catodo compósito de LSM/YSZ, dessa maneira possibilitando o aumento da TPB (40,41) . Na TPB, a reação de troca do oxigênio entre o eletrodo e o eletrólito é composta de séries etapas de reação paralela e consecutiva, a qual inclui a adsorção do oxigênio sobre a superfície, dissociação, difusão na superfície, transferência de carga do elétron, incorporação do oxigênio para dentro do eletrólito e expulsão de vacância (42,43) .…”

Section: Configuração Planarunclassified

“…O catodo compósito LSM/YSZ pode ser obtido por diferentes rotas de síntese, como mistura de sólidos, complexo polimerizável, precursor polimérico com suspensão coloidal e outras (18,40,41) .…”

Section: Síntese Do Catodo Lsm E Do Catodo Compósito Lsm/yszunclassified

“…(39) , obtidos pela mistura dos pós de LSM (sintetizado pela técnica dos citratos) com pós de YSZ (Tosoh Corporation, Tokyo, Japan). A mistura dos pós cerâmicos ocorreu em um moinho atritor por 4 horas em meio orgânico (álcool isopropílico) nas seguintes proporções mássicas de 50% LSM e 50% YSZ e posterior secagem a temperatura de 60 °C (40) . A Assim, a suspensão foi preparada para ser utilizada no aerógrafo.…”

Section: Estes Pós De Ysz Foram Conformados Em Pastilhas De Aproximadunclassified

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Síntese, processamento e caracterização das meia-células de óxido sólido catodo/eletrólito de manganito de lantânio dopado com estrôncio/zircônia estabilizada com ítria

Chiba¹

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Composite (La, Sr)MnO3–YSZ cathode for SOFC

Cited by 99 publications

References 12 publications

Structural and electrical properties of Sr(Ti, Fe)O3-δ materials for SOFC cathodes

Structural and electrical properties of Sr(Ti, Fe)O3-δ materials for SOFC cathodes

Microstructure Sensitive Design and Processing in Solid Oxide Electrolyzer Cell

Síntese, processamento e caracterização das meia-células de óxido sólido catodo/eletrólito de manganito de lantânio dopado com estrôncio/zircônia estabilizada com ítria

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