Impact of multi-cationic B-sublattice upon crystal structure, transport and electrochemical properties of perovskite oxides LaBO3

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL Solid State Ionics Pub Date : 2024-10-31 DOI:10.1016/j.ssi.2024.116729

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Abstract

The oxygen exchange with the gas phase, thermal expansion, and electrical transport properties of a multi-cationic perovskite LaMn_0.2Fe_0.2Co_0.2Ni_0.2Cu_0.2O_3–δ and its four-cation derivatives have been investigated. The B-sublattice content was found to impact the crystal structure, expansion, and oxygen release with temperature, as well as the electrical properties. The oxides exhibit predominantly p-type semiconducting behavior, with activation energies ranging from 0.04 to 0.26 eV. The optimal compound of LaFe_0.25Co_0.25Ni_0.25Cu_0.25O_3–δ was selected based on the cobination of the highest oxygen nonstiochiometry with maximum electrical conductivity, which reaches almost 500 S/cm at 750 °C. The symmetrical cell on LSGM supporting electrolyte has a polarization resistance of 0.12 Ω cm² at 800 °C and an activation energy of 152 kJ/mol. The obtained characteristic was found to be better than one for the five-cation perovskite, casting doubt on the advantages of applying the high-entropy materials concept to the development of solid oxide fuel cells.

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多阳离子 B 亚晶格对过氧化物 LaBO3 的晶体结构、传输和电化学特性的影响

研究了多阳离子包晶石 LaMn0.2Fe0.2Co0.2Ni0.2Cu0.2O3-δ 及其四阳离子衍生物与气相的氧交换、热膨胀和电传输特性。研究发现，B 子晶格含量会影响晶体结构、膨胀、氧随温度的释放以及电学特性。这些氧化物主要表现出 p 型半导体行为，活化能在 0.04 至 0.26 eV 之间。LaFe0.25Co0.25Ni0.25Cu0.25O3-δ 的最佳化合物是在 750 °C 时达到近 500 S/cm 的最高电导率和最高氧不稳定度的基础上选出的。以 LSGM 为支撑电解质的对称电池在 800 °C 时的极化电阻为 0.12 Ω cm2，活化能为 152 kJ/mol。所获得的特性优于五阳离子包晶石的特性，这使人们对应用高熵材料概念开发固体氧化物燃料电池的优势产生了怀疑。

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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.