Morphology-tailored nanofiber oxygen electrode enables efficiency and durability of solid oxide cells

IF 8.3 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2025-10-02 DOI:10.1016/j.ijhydene.2025.151821

Peng Fu , Jiakun Sun , Wei Han , Liting Li , Liuzhen Bian , Pengyu Wei , Changyang Liu , Ju Peng , Shengli An

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引用次数: 0

Abstract

Developing oxygen electrodes with excellent electrocatalytic activity and outstanding Sr segregation resistance remains a critical sustainability challenge for the industrial deployment of solid oxide cells (SOCs). Herein, we demonstrate a hollow (La_0.6Sr_0.4)_0.95Co_0.2Fe_0.8O_3-δ nanofibers (LSCF-0.3) with enhanced catalytic activity for oxygen reduction/evolution reaction (ORR/OER) by electrospun method. The unique hollow morphology improves the active sites, resulting in 76 % lower polarization resistance performance (0.040 vs. 0.143 Ω cm² @ 750 °C). Moreover, benefited from the hollow structure, the exceptional Sr segregation resistance significantly improves the stability (0.29 % h⁻¹ vs. 1.74 % h⁻¹). Electrochemical testing demonstrates superior bifunctional performance with electrolysis current density of 1.49 A cm⁻²@1.6 V and peak power density of 1.22 W cm⁻² @0.75V at 750 °C. Finally, the LSCF-0.3 oxygen electrode exhibits remarkably long-term stability in both fuel cell and electrolysis modes. Our work establishes electrospinning-enabled morphology control as a green manufacturing paradigm for durable energy conversion devices.

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纳米纤维氧电极使固体氧化物电池的效率和耐用性得以提高

开发具有优异电催化活性和优异抗Sr偏析性能的氧电极仍然是固体氧化物电池（soc）工业部署的关键挑战。本文用静电纺丝法制备了一种中空（La0.6Sr0.4）0.95Co0.2Fe0.8O3-δ纳米纤维（LSCF-0.3），该纤维具有较强的氧还原/析出反应（ORR/OER）催化活性。独特的空心形貌改善了活性位点，导致极化电阻性能降低76% （0.040 vs. 0.143 Ω cm2 @ 750°C）。此外，得益于中空结构，优异的抗Sr偏析性能显著提高了稳定性（0.29% h−1 vs. 1.74% h−1）。电化学测试表明，750℃电解电流密度为1.49 A cm−2@1.6 V，峰值功率密度为1.22 W cm−2 @0.75V，具有优异的双功能性能。最后，LSCF-0.3氧电极在燃料电池和电解模式下均表现出显著的长期稳定性。我们的工作建立了电纺丝使形态控制作为一个绿色制造范式的耐用的能量转换装置。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.