IT-SOFC 的高性能热膨胀偏移 LSCF-SZM 阴极

IF 3 4区 材料科学 Q3 CHEMISTRY, PHYSICAL
Mengsha Li , Fei Lu , Ruiwei Cui , Lei Shi , Jiefang Wang , Hao He , Jinrui Su , Bin Cai
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引用次数: 0

摘要

商用固体氧化物燃料电池(SOFC)的一大风险是阴极和电解质层之间的潜在分层。2021 年提出的热膨胀抵消策略可以有效缓解这一问题,即传统阴极与负热膨胀氧化物复合。在此,我们开发了名为 LaSrCoFeO (LSCF)-xSmZnMnO (SZM) (x = 0、5、10、15 和 20 wt.%)的新型复合阴极。LSCF 和 SZM 相之间形成了具有明显晶格畸变的随机相界。x = 10% 时电化学性能最佳。在 923-723 K 时,相应的峰值功率密度为 1.151-0.147 W-cm,比 x = 0 时的峰值功率密度(0.731-0.087 W-cm)高出 57-69%。电导率、电化学阻抗谱(EIS)和弛豫时间分布(DRT)结果进一步证实,阴极和电解质层之间热匹配的改善应是中温 SOFC(IT-SOFC)高性能的原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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).

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来源期刊
Solid State Ionics
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.
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