{"title":"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","authors":"Ernesto Tagarelli , Jesús Vega-Castillo , Mariela Ortiz , Horacio Troiani , Corina M. Chanquía , Alejandra Montenegro-Hernández","doi":"10.1016/j.ssi.2024.116719","DOIUrl":null,"url":null,"abstract":"<div><div>La<sub>0.1</sub>Sr<sub>0.9</sub>TiO<sub>3</sub> (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 N<sub>2</sub> 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.</div></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":"417 ","pages":"Article 116719"},"PeriodicalIF":3.0000,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Study of La0.1Sr0.9TiO3 electrochemical response as anode for SOFC and its relation with microstructure\",\"authors\":\"Ernesto Tagarelli , Jesús Vega-Castillo , Mariela Ortiz , Horacio Troiani , Corina M. Chanquía , Alejandra Montenegro-Hernández\",\"doi\":\"10.1016/j.ssi.2024.116719\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>La<sub>0.1</sub>Sr<sub>0.9</sub>TiO<sub>3</sub> (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 N<sub>2</sub> 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.</div></div>\",\"PeriodicalId\":431,\"journal\":{\"name\":\"Solid State Ionics\",\"volume\":\"417 \",\"pages\":\"Article 116719\"},\"PeriodicalIF\":3.0000,\"publicationDate\":\"2024-10-23\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Solid State Ionics\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0167273824002674\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solid State Ionics","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0167273824002674","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Study of La0.1Sr0.9TiO3 electrochemical response as anode for SOFC and its relation with microstructure
La0.1Sr0.9TiO3 (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.
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.
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
