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Modified strontium titanates: from defect chemistry to SOFC anodes

机译：改性钛酸锶：从缺陷化学到SOFC阳极

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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(1-x)BO(3)) and cation-stoichiometry (ABO(3+delta)). 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.
机译：改性钛酸锶最近因其作为固体氧化物燃料电池（SOFC）阳极材料的潜力而备受关注。与镍基金属陶瓷阳极相比，它们固有的氧化还原稳定性以及对硫中毒和结焦的优异耐受性可以显着提高SOFC系统的耐久性。可以采用各种替代策略来优化这些钛酸锶中的材料性能，例如电导率，电催化活性，化学稳定性和可烧结性，从而提高机械强度。替代策略不仅涵盖取代基的选择和数量，而且涵盖钙钛矿缺陷化学，区分A位缺陷（A（1-x）BO（3））和阳离子化学计量（ABO（3 +δ））。文献表明后两种组成方法在材料特性上存在明显差异。在讨论了改性锶钛酸盐的缺陷化学性质后，本文对三种不同的A-位缺陷供体（La，Y，Nb）取代的钛酸锶的电行为和燃料电池性能进行了综述。当使用氢作为燃料时，在电解质以及阳极支撑的电池设计中都获得了令人瞩目的性能。经过无数次氧化还原循环后，性能得以保留。含硫和碳燃料的长期稳定性仍需要更详细地研究。

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