Study of La0.1Sr0.9TiO3 electrochemical response as anode for SOFC and its relation with microstructure

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL Solid State Ionics Pub Date : 2024-10-23 DOI:10.1016/j.ssi.2024.116719

Ernesto Tagarelli , Jesús Vega-Castillo , Mariela Ortiz , Horacio Troiani , Corina M. Chanquía , Alejandra Montenegro-Hernández

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Abstract

La_0.1Sr_0.9TiO₃ (LST) perovskite has been studied as anode material for Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC) applications. LST powders were synthesized by two chemical methods, one employed hexamethylenetetramine (HMTA) as a complexing agent while the other utilized ethylenediaminetetraacetic acid (EDTA). These approaches yielded different microstructures as evidenced by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and N₂ adsorption/desorption isotherms studies. The effect of the microstructure on the electrochemical behavior of the obtained electrodes was studied by Electrochemical Impedance Spectroscopy (EIS) by varying the hydrogen partial pressure and the temperature. In addition, the evolution of specific area resistance with the hydrogen partial pressure allowed the identification of the reaction mechanism. The results of EIS were studied by electrical equivalent circuit (EEC) and distribution of relaxation times (DRT). The results suggest that the hydrogen oxidation reaction (HOR) limiting step for both samples is controlled by hydrogen dissociative-adsorption at the surface. The hydrogen adsorption is faster at the electrode formed by smaller nanoparticles, in which the activation energy decreases and the rate coefficient changes.

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研究作为 SOFC 阳极的 La0.1Sr0.9TiO3 电化学响应及其与微观结构的关系

研究人员将 La0.1Sr0.9TiO3 (LST) 包晶体作为中温固体氧化物燃料电池 (IT-SOFC) 的阳极材料。LST 粉末是通过两种化学方法合成的，一种采用六亚甲基四胺（HMTA）作为络合剂，另一种采用乙二胺四乙酸（EDTA）。X 射线粉末衍射（XRD）、透射电子显微镜（TEM）、扫描电子显微镜（SEM）和 N2 吸附/解吸等温线研究证明，这些方法产生了不同的微观结构。通过改变氢分压和温度，利用电化学阻抗谱（EIS）研究了微观结构对所获电极电化学行为的影响。此外，比面积电阻随氢气分压的变化也有助于确定反应机制。通过电气等效电路（EEC）和弛豫时间分布（DRT）对 EIS 结果进行了研究。结果表明，两种样品的氢氧化反应（HOR）限制步骤都是由表面的氢离解吸附控制的。在由较小纳米颗粒形成的电极上，氢吸附速度更快，活化能降低，速率系数发生变化。

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.