Mengsha Li , Fei Lu , Ruiwei Cui , Lei Shi , Jiefang Wang , Hao He , Jinrui Su , Bin Cai
{"title":"IT-SOFC 的高性能热膨胀偏移 LSCF-SZM 阴极","authors":"Mengsha Li , Fei Lu , Ruiwei Cui , Lei Shi , Jiefang Wang , Hao He , Jinrui Su , Bin Cai","doi":"10.1016/j.ssi.2024.116639","DOIUrl":null,"url":null,"abstract":"<div><p>One big risk for commercial solid oxide fuel cells (SOFCs) is the potential delamination between cathode and electrolyte layers. It can be effectively alleviated by the thermal expansion offset strategy proposed in 2021, i.e., conventional cathode composited with the negative thermal expansion oxides. Here novel composite cathodes designated as La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3-δ</sub> (LSCF)-xSm<sub>0.85</sub>Zn<sub>0.15</sub>MnO<sub>3</sub> (SZM) (x = 0, 5, 10, 15, and 20 wt.%) are developed. Random phase boundaries with apparent lattice distortion are formed between LSCF and SZM phases. The best electrochemical performance is obtained for x = 10%. The corresponding peak power density at 923–723 K is 1.151–0.147 W·cm<sup>−2</sup>, which is 57–69% higher than that (0.731–0.087 W·cm<sup>−2</sup>) for x = 0. More importantly, markedly enhanced long-term and thermal cycling stability is also obtained. Results of electrical conductivity, electrochemical impedance spectroscopy (EIS) and distribution of relaxation time (DRT) results further confirm that improved thermal match between cathode and electrolyte layers should be responsible for the high performance of intermediate temperature SOFCs (IT-SOFCs).</p></div>","PeriodicalId":431,"journal":{"name":"Solid State Ionics","volume":null,"pages":null},"PeriodicalIF":3.0000,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"High performance thermal expansion offset LSCF-SZM cathodes of IT-SOFCs\",\"authors\":\"Mengsha Li , Fei Lu , Ruiwei Cui , Lei Shi , Jiefang Wang , Hao He , Jinrui Su , Bin Cai\",\"doi\":\"10.1016/j.ssi.2024.116639\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>One big risk for commercial solid oxide fuel cells (SOFCs) is the potential delamination between cathode and electrolyte layers. It can be effectively alleviated by the thermal expansion offset strategy proposed in 2021, i.e., conventional cathode composited with the negative thermal expansion oxides. Here novel composite cathodes designated as La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3-δ</sub> (LSCF)-xSm<sub>0.85</sub>Zn<sub>0.15</sub>MnO<sub>3</sub> (SZM) (x = 0, 5, 10, 15, and 20 wt.%) are developed. Random phase boundaries with apparent lattice distortion are formed between LSCF and SZM phases. The best electrochemical performance is obtained for x = 10%. The corresponding peak power density at 923–723 K is 1.151–0.147 W·cm<sup>−2</sup>, which is 57–69% higher than that (0.731–0.087 W·cm<sup>−2</sup>) for x = 0. More importantly, markedly enhanced long-term and thermal cycling stability is also obtained. Results of electrical conductivity, electrochemical impedance spectroscopy (EIS) and distribution of relaxation time (DRT) results further confirm that improved thermal match between cathode and electrolyte layers should be responsible for the high performance of intermediate temperature SOFCs (IT-SOFCs).</p></div>\",\"PeriodicalId\":431,\"journal\":{\"name\":\"Solid State Ionics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.0000,\"publicationDate\":\"2024-07-06\",\"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/S0167273824001875\",\"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/S0167273824001875","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}
High performance thermal expansion offset LSCF-SZM cathodes of IT-SOFCs
One big risk for commercial solid oxide fuel cells (SOFCs) is the potential delamination between cathode and electrolyte layers. It can be effectively alleviated by the thermal expansion offset strategy proposed in 2021, i.e., conventional cathode composited with the negative thermal expansion oxides. Here novel composite cathodes designated as La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF)-xSm0.85Zn0.15MnO3 (SZM) (x = 0, 5, 10, 15, and 20 wt.%) are developed. Random phase boundaries with apparent lattice distortion are formed between LSCF and SZM phases. The best electrochemical performance is obtained for x = 10%. The corresponding peak power density at 923–723 K is 1.151–0.147 W·cm−2, which is 57–69% higher than that (0.731–0.087 W·cm−2) for x = 0. More importantly, markedly enhanced long-term and thermal cycling stability is also obtained. Results of electrical conductivity, electrochemical impedance spectroscopy (EIS) and distribution of relaxation time (DRT) results further confirm that improved thermal match between cathode and electrolyte layers should be responsible for the high performance of intermediate temperature SOFCs (IT-SOFCs).
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.
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