Advanced electrocatalytic performance of the configuration entropy cobalt-free Bi0.5Sr0.5FeO3–δ cathode catalysts for solid oxide fuel cells

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications Pub Date : 2024-08-23 DOI:10.1016/j.elecom.2024.107795

Shichao Zhang, Qiang Li, Liping Sun, Hui Zhao

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Abstract

The medium-entropy perovskite oxide Bi_0.5Sr_0.5Fe_0.85Nb_0.05Ta_0.05Sb_0.05O_3–_δ (BSFNTS) is evaluated as a potential cathode catalyst for solid oxide fuel cells (SOFCs). The crystal structure, electrocatalytic activity, oxygen reduction kinetics, and CO₂ tolerance are systematically investigated. At 700 °C, the BSFNTS cathode exhibits excellent electrochemical performance with a polarization resistance as low as 0.095 Ω cm². The maximal power density of the fuel cell with the BSFNTS cathode is 900 mW cm⁻². Furthermore, the rate control step for the oxygen reduction reaction (ORR) of the electrode is primarily identified as the adsorbed and diffusion process of the molecule oxygen. The BSFNTS electrode presents excellent CO₂ tolerance and durability in a CO₂-containing atmosphere, which is related to the high acidity of Bi, Nb, Ta, and Sb cations and the larger average bonding energy of BSFNTS. The preliminary results indicate that BSFNTS medium-entropy oxide is an attractive cathode electrocatalyst for SOFCs.

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用于固体氧化物燃料电池的构型熵无钴 Bi0.5Sr0.5FeO3-δ 阴极催化剂的先进电催化性能

该研究评估了中熵包晶氧化物 Bi0.5Sr0.5Fe0.85Nb0.05Ta0.05Sb0.05O3-δ （BSFNTS）作为固体氧化物燃料电池（SOFC）潜在阴极催化剂的性能。对晶体结构、电催化活性、氧还原动力学和二氧化碳耐受性进行了系统研究。700 °C 时，BSFNTS 阴极表现出优异的电化学性能，极化电阻低至 0.095 Ω cm2。使用 BSFNTS 阴极的燃料电池的最大功率密度为 900 mW cm-2。此外，电极氧还原反应（ORR）的速率控制步骤主要是氧分子的吸附和扩散过程。BSFNTS 电极在含二氧化碳的大气中具有优异的二氧化碳耐受性和耐久性，这与 Bi、Nb、Ta 和 Sb 阳离子的高酸度以及 BSFNTS 较高的平均键能有关。初步研究结果表明，BSFNTS 中熵氧化物是一种极具吸引力的 SOFC 阴极电催化剂。

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来源期刊

Electrochemistry Communications 工程技术-电化学

CiteScore

8.50

自引率

3.70%

发文量

160

审稿时长

1.2 months

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