Gd and cu co-doped BaFeO3-δ as a cobalt-free air electrode for solid oxide electrolysis cell

IF 3 4区 材料科学 Q3 CHEMISTRY, PHYSICAL
Zaiguo Fu , Changling Quan , Yan Shao , Yanhua Lei , Binxia Yuan , Qunzhi Zhu
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引用次数: 0

Abstract

Solid oxide electrolysis cell (SOEC) is an efficient and environmentally friendly energy conversion device. The commercialization of SOEC is limited by the oxygen electrodes, whose problems include high costs and unexpected degradation of cobalt/strontium. In this study, we proposed a co-doping strategy and synthesized cobalt-free and strontium-free perovskite materials, specifically Ba0.95Gd0.05Fe1-xCuxO3-δ (BGFCux), via the sol-gel method. These materials were evaluated as potential air electrodes for SOEC. The BGFCux samples were systematically characterized by crystal structure, oxygen content, thermal properties, electrical conductivity, and electrochemical performance. X-ray diffraction results show that the solid-solution concentration of Cu in BGFCux cannot exceed 0.1. X-ray photoelectron spectroscopy results suggest that Cu doping increases oxygen vacancy concentration. Among all BGFCux perovskites, BGFCu0.1 exhibited a low polarization resistance of 0.069 Ω·cm2 at 800 °C (0.2 V) and a high current density of 216 mA·cm−2 at an anodic bias of 40 mV. Hence, the Gd and Cu co-doped BGFCu0.1 perovskite material is a promising air electrode for SOEC.

作为固体氧化物电解池无钴空气电极的钆和铜共掺杂 BaFeO3-δ
固体氧化物电解池(SOEC)是一种高效、环保的能源转换装置。由于氧电极存在成本高和钴/锶意外降解等问题,SOEC 的商业化受到限制。在本研究中,我们提出了一种共掺杂策略,并通过溶胶-凝胶法合成了无钴和无锶的包晶材料,特别是 Ba0.95Gd0.05Fe1-xCuxO3-δ (BGFCux)。这些材料被评估为 SOEC 的潜在空气电极。对 BGFCux 样品的晶体结构、氧含量、热性能、电导率和电化学性能进行了系统表征。X 射线衍射结果表明,BGFCux 中铜的固溶浓度不能超过 0.1。X 射线光电子能谱结果表明,掺入铜会增加氧空位浓度。在所有 BGFCux 包晶石中,BGFCu0.1 在 800 ℃(0.2 V)条件下表现出 0.069 Ω-cm2 的低极化电阻和 216 mA-cm-2 的高电流密度(阳极偏压为 40 mV)。因此,钆和铜共掺杂的 BGFCu0.1 包晶材料是一种很有前途的 SOEC 空气电极。
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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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