Thermomechanical properties of Y-substituted SrTiO3 used as re-oxidation stable anode substrate material

Vasechko, Viacheslav; Huang, Baotong; Ma, Qianli; Tietz, Frank; Malzbender, Jürgen

doi:10.1016/j.jeurceramsoc.2014.05.013

Cited by 9 publications

(6 citation statements)

References 20 publications

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“…The characteristic strengths and Young's Moduli measured for the LSCTA-anode supports and half cells compare well, in both cases, with previous findings on a similar material, Y0.07Sr0.895TiO3 [23,28]. However, they are lower than values reported in literature for Ni/YSZ cermets, even though there seems to be a large spread in the latter, i.e.…”

Section: Accepted Manuscriptsupporting

confidence: 87%

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Scaling up aqueous processing of A-site deficient strontium titanate for SOFC anode supports

Verbraeken

Sudireddy

Vasechko

et al. 2018

Journal of the European Ceramic Society

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All ceramic anode supported half cells of technically relevant scale were fabricated in this study, using a novel strontium titanate anode material. The use of this material would be highly advantageous in solid oxide fuel cells due to its redox tolerance and resistance to coking and sulphur poisoning. Successful fabrication was possible through aqueous tape casting of both anode support and electrolyte layers and subsequent lamination. Screen printing of electrolyte layers onto green anode tapes was also attempted but resulted in cracked electrolyte layers upon firing. Microstructural, electrical and mechanical properties of anode supports and half cells will be discussed. The use of two different commercial titanate powders with nominal identical, but in reality different stoichiometries, strongly affect electrical and mechanical properties. Careful consideration of such variations between powder suppliers, and batches of the same supplier, is critical for the successful implementation of ceramic anode supported solid oxide fuel cells.

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Section: Accepted Manuscriptsupporting

confidence: 87%

“…In previous studies for a similar perovskite (Y-doped strontium titanate) a and n were determined as 1.7 and 1.3, respectively [23]. The validity of equation (2) with these constants was performed based on three grades of the LSCTA-material ( Table 3).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Scaling up aqueous processing of A-site deficient strontium titanate for SOFC anode supports

Verbraeken

Sudireddy

Vasechko

et al. 2018

Journal of the European Ceramic Society

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“…The literature concerning an incorporation of Cr into SrTiO 3 structure is usually focused on the photocatalytic properties of this system [17][18][19], while the electrical and catalytic properties are not discussed. Together with the effects of the previous study stating the high electrical conductivity of Y-doped SrTiO 3 in reducing atmosphere [4,9,10], it became an impulse to the synthesis of the doubledoped, simultaneously with yttrium and chromium, SrTiO 3 where chromium is a factor which can determine the catalytic activity of the entire system. The characterisation of these materials was undertaken to evaluate their potential value as anode materials for SOFC cells, since the simultaneous doping of SrTiO 3 structure with Y and Cr was not previously discussed in the literature.…”

Section: Introductionmentioning

confidence: 98%

“…Their incorporation into strontium (A position) and/or titanium (B position) sublattice leads to the modification of an electronic structure and consequently-the electrical properties of materials [3][4][5]. The donor doping, both in strontium (with lanthanum or yttrium) and titanium (with niobium or manganese) sublattice, results in an increase of the conductivity of materials working in a hydrogen atmosphere [6][7][8][9][10][11][12][13]. Yttrium and lanthanum are the most common donor dopants for the strontium sublattice, while niobium is often used for the titanium one.…”

Section: Introductionmentioning

confidence: 99%

Porous Y and Cr–doped SrTiO3 materials—electrical and redox properties

Łącz

Drożdż

2019

J Solid State Electrochem

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Highly porous materials in the Sr 0.96 Y 0.04 Ti 1-x Cr x O 3 system (where x = 0, 2, 4, 8 mol.%) were obtained by wet synthesis method. The structural and electrical properties of these materials were determined together with the ability to participate in oxidation/ reduction reactions, since yttrium is responsible for high electrical conductivity in reducing atmosphere and chromium is a factor affecting the catalytic properties. For the material with the highest assumed amount of chromium, the small content of an additional phase (Cr 2 O 3) was observed. SrTiO 3 lattice parameters together with the results of temperature-programmed reduction (TPR) and temperature-programmed oxidation (TPOx) tests and Seebeck coefficient measurements allowed to determine the oxidation states of chromium in the received materials. It was shown that introduction of Y into strontium sublattice stabilises the strontium titanate structure and affects the oxidation state of chromium incorporated into the titanium sublattice. The defect structure in Sr 0.96 Y 0.04 Ti 1-x Cr x O 3 system is a complex problem, since yttrium is a donor type dopant and chromium due to the possible +3 and +6 oxidation states can be considered both acceptor and donor type one. Thus, a change in the conduction mechanism with the chromium content was observed in both oxidising and reducing atmosphere.

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“…Recently, various perovskite structure-based anodes have been reported to overcome these problems. Doped perovskite materials, such as doped strontium titanate [6][7][8][9] and doped lanthanum chromite [10][11][12], could be good candidates for alternative anode materials. These perovskite materials often show mixed ionic and electronic conductive (MIEC) properties, hence, the electrochemically active sites in the anode can be extended beyond the TPB area.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Sr_0.92Y_0.08TiO_3-δAnode in Humidified MethaneFuel for Intermediate Temperature Solid Oxide Fuel Cells

Park¹,

Yun²

2016

Journal of Electrochemical Science and Technology

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Sr 0.92 Y 0.08 TiO 3-δ (SYT) was investigated as an alternative anode in humidified CH 4 fuel for SOFCs at low temperatures (650 o C-750 o C) and compared with the conventional Ni/yttria-stabilized zirconia (Ni/YSZ) anode. The goal of the study was to directly use a hydrocarbon fuel in a SOFC without a reforming process. The cell performance of the SYT anode was relatively low compared with that of the Ni/YSZ anode because of the poor electrochemical catalytic activity of SYT. In the presence of CH 4 fuel, however, the cell performance with the SYT anode decreased by 20%, in contrast to the 58% decrease in the case of the Ni/YSZ anode. The severe degradation of cell performance observed with the Ni/YSZ anode was caused by carbon deposition that resulted from methane thermal cracking. Carbon was much less detected in the SYT anode due to the catalytic oxidation. Otherwise, a significant amount of bulk carbon was detected in the Ni/YSZ anode.

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Thermomechanical properties of Y-substituted SrTiO3 used as re-oxidation stable anode substrate material

Cited by 9 publications

References 20 publications

Scaling up aqueous processing of A-site deficient strontium titanate for SOFC anode supports

Scaling up aqueous processing of A-site deficient strontium titanate for SOFC anode supports

Porous Y and Cr–doped SrTiO3 materials—electrical and redox properties

Characteristics of Sr_0.92Y_0.08TiO_3-δAnode in Humidified MethaneFuel for Intermediate Temperature Solid Oxide Fuel Cells

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Thermomechanical properties of Y-substituted SrTiO3 used as re-oxidation stable anode substrate material

Cited by 9 publications

References 20 publications

Scaling up aqueous processing of A-site deficient strontium titanate for SOFC anode supports

Scaling up aqueous processing of A-site deficient strontium titanate for SOFC anode supports

Porous Y and Cr–doped SrTiO3 materials—electrical and redox properties

Characteristics of Sr0.92Y0.08TiO3-δAnode in Humidified MethaneFuel for Intermediate Temperature Solid Oxide Fuel Cells

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Product

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About

Characteristics of Sr_0.92Y_0.08TiO_3-δAnode in Humidified MethaneFuel for Intermediate Temperature Solid Oxide Fuel Cells