On the chemical interaction of nanoscale lanthanum doped strontium titanates with common scandium and yttrium stabilized electrolyte materials

Burnat, Dariusz; Heel, André; Holzer, Lorenz; Otal, Eugenio H.; Kata, Dariusz; Graule, Thomas

doi:10.1016/j.ijhydene.2012.09.022

Cited by 15 publications

(10 citation statements)

References 66 publications

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“…10 Several authors reported that Ti was easily diffused from doped-SrTiO 3 into zirconia electrolyte after sintered at high temperature, especially in A-site deficient LST. 17,18 The solubility of Ti in zirconia electrolyte was about 10 mol%. 18 In present case, Ti was diffused from LST-0.85 to ScSZ drived by the concentration difference of Ti due to the existence of rutile TiO 2 in LST-0.85.…”

Section: Discussionmentioning

confidence: 99%

“…15,16 However, Burnat et al reported that A-site deficient LST could also chemically interact with both Y and Sc doped zirconia structures. 17 Burnat et al indicated that the detected chemical interactions between A-site deficient LST and Y and Sc doped zirconia were only associated with the high mobility of Ti ions, which was significantly hindered under reducing conditions. 17 Ma et al found the interaction phenomenon between YSZ electrolyte and Y-substituted SrTiO 3 anode (Ti diffusion but no Sr migration) after sintered at 1400 • C for 5 h in reduction atmosphere, and the conductivity of SYT decreased because of the Ti diffusion.…”

mentioning

confidence: 99%

“…17 Burnat et al indicated that the detected chemical interactions between A-site deficient LST and Y and Sc doped zirconia were only associated with the high mobility of Ti ions, which was significantly hindered under reducing conditions. 17 Ma et al found the interaction phenomenon between YSZ electrolyte and Y-substituted SrTiO 3 anode (Ti diffusion but no Sr migration) after sintered at 1400 • C for 5 h in reduction atmosphere, and the conductivity of SYT decreased because of the Ti diffusion. 18 19 In our previous study, it is found that a critical point of A-site deficiency value for TiO 2 precipitation in A-site deficient LST should exist.…”

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confidence: 99%

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Effect of Interaction between A-Site Deficient LST and ScSZ on Electrochemical Performance of SOFC

Chen¹,

Kishimoto²,

Yamaji³

et al. 2014

J. Electrochem. Soc.

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The effect of the interaction between A-site deficient La-substituted SrTiO 3 (LST) and 1CeO 2 -10Sc 2 O 3 -89ZrO 2 (ScSZ) on the electrochemical performance of SOFC was investigated. (L 0.25 Sr 0.75 ) 0.9 TiO 3 (LST-0.9) with perovskite phase and (L 0.25 Sr 0.75 ) 0.85 TiO 3 (LST-0.85) with perovskite phase and little rutile TiO 2 phase were produced. ScSZ electrolyte-supported SOFCs with LST-0.9/ScSZ composite anode and LST-0.85/ScSZ composite anode sintered at different temperature (1000 and 1200 • C) were respectively performed at 1000 • C in humidified H 2 . Rapid electrochemical performance degradation occurred during the initial few hours of the test for the cells with LST-0.9/ScSZ composite anode and LST-0.85/ScSZ composite anode sintered at 1200 • C. Inter-diffusion processes of Zr and Sc from ScSZ into LST-0.9 and Ti from LST-0.85 into ScSZ occurred during anode preparation processes and the performance test were respectively considered as dominant degradation mechanism for the cells with LST-0.9/ScSZ composite anode and LST-0.85/ScSZ composite anode. Details of the degradation mechanism for the cells with two kinds of anodes were discussed respectively.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Effect of Interaction between A-Site Deficient LST and ScSZ on Electrochemical Performance of SOFC

Chen¹,

Kishimoto²,

Yamaji³

et al. 2014

J. Electrochem. Soc.

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“…Moreover, Burnat et al recently published a report clearly showing Ti diffusion into common zirconia based electrolyte, when A-site decient La substituted strontium titanates are used. 38 Here diffusion seems much more pronounced in samples red in air however, whereas ring under reducing conditions seems an effective way to limit this diffusion phenomenon. Similar behaviour was found for heavily A-site decient Y-substituted SrTiO 3 .…”

Section: View Article Onlinementioning

confidence: 93%

Modified strontium titanates: from defect chemistry to SOFC anodes

et al. 2015

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Modified strontium titanates have received much attention recently for their potential as anode material in solid oxide fuel cells (SOFC). Their inherent redox stability and superior tolerance to sulphur poisoning and coking as compared to Ni based cermet anodes could improve durability of SOFC systems dramatically.Various substitution strategies can be deployed to optimise materials properties in these strontium titanates, such as electronic conductivity, electrocatalytic activity, chemical stability and sinterability, and thus mechanical strength. Substitution strategies not only cover choice and amount of substituent, but also perovskite defect chemistry, distinguishing between A-site deficiency (A 1Àx BO 3 ) and cationstoichiometry (ABO 3+d ). Literature suggests distinct differences in the materials properties between the latter two compositional approaches. After discussing the defect chemistry of modified strontium titanates, this paper reviews three different A-site deficient donor (La, Y, Nb) substituted strontium titanates for their electrical behaviour and fuel cell performance. Promising performances in both electrolyte as well as anode supported cell designs have been obtained, when using hydrogen as fuel.Performances are retained after numerous redox cycles. Long term stability in sulphur and carbon containing fuels still needs to be explored in greater detail.

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“…For the synthesis of LST composite anode materials, the common way was to mix pure LST with other materials automatically. 62,74,106,108,113,114,120,137 Impregnation or inltration technology 107,110,112,116 was another commonly used and effective way to add the active components to the LST materials. Combination of the combustion method and automatical mix, 118 colloidal deposition technique 119 were also applied to blend LST and other materials.…”

Section: Lst Synthesis Methodsmentioning

confidence: 99%

Progress in La-doped SrTiO₃(LST)-based anode materials for solid oxide fuel cells

et al. 2014

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Solid oxide fuel cells (SOFCs) have appeared as a promising technology for a wide variety of potential commercial applications to lessen the urgency of energy shortage and environmental pollution associated with using conventional fossil fuels. Among the worldwide SOFCs research activities, the progress of SOFCs fed with hydrocarbon fuels that contain trace amount of H 2 S is one of the most important research directions. Thereby, it becomes crucial to design novel electrode materials with enhanced catalytic activity, stability and tolerances to carbon deposition and sulfur poisoning. Lasubstituted SrTiO 3 (LST) based perovskite anodes have been widely investigated because of their high electronic conductivity in reducing atmospheres, excellent dimensional and chemical stability upon redox cycling and outstanding sulfur and coking tolerances. In this review paper, we will describe the development of LST-based anode materials for SOFCs in recent years. The synthesis, structure and fuel cell performance of the doped LST and LST-based composite anode materials are summarized in detail. The mechanism of H 2 S-induced enhancement effect for electrochemical reactions on the LST-based anode materials is explored. The challenges related to the future developments of LST-based anode materials for SOFCs are also discussed.

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On the chemical interaction of nanoscale lanthanum doped strontium titanates with common scandium and yttrium stabilized electrolyte materials

Cited by 15 publications

References 66 publications

Effect of Interaction between A-Site Deficient LST and ScSZ on Electrochemical Performance of SOFC

Effect of Interaction between A-Site Deficient LST and ScSZ on Electrochemical Performance of SOFC

Modified strontium titanates: from defect chemistry to SOFC anodes

Progress in La-doped SrTiO₃(LST)-based anode materials for solid oxide fuel cells

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On the chemical interaction of nanoscale lanthanum doped strontium titanates with common scandium and yttrium stabilized electrolyte materials

Cited by 15 publications

References 66 publications

Effect of Interaction between A-Site Deficient LST and ScSZ on Electrochemical Performance of SOFC

Effect of Interaction between A-Site Deficient LST and ScSZ on Electrochemical Performance of SOFC

Modified strontium titanates: from defect chemistry to SOFC anodes

Progress in La-doped SrTiO3(LST)-based anode materials for solid oxide fuel cells

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Product

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About

Progress in La-doped SrTiO₃(LST)-based anode materials for solid oxide fuel cells