Co-free and Sr-free double-perovskite oxide PrBaFe1.9Nb0.1O5+δ as a potential electrode material for symmetrical solid oxide fuel cells

IF 2.4 4区化学 Q3 CHEMISTRY, PHYSICAL

Ionics Pub Date : 2024-07-27 DOI:10.1007/s11581-024-05724-w

Feng Wang, Jinyan Qi, Pengkai Shan, Bin Qian, Lishuai Xie, Yifeng Zheng, Han Chen, Lin Ge

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Abstract

Double-perovskite oxide PrBaFe₂O_5+δ (PBF) is considered as a potential electrode material because of its superior oxygen reduction reaction (ORR) activity in air and excellent stability in wet hydrogen atmospheres. However, the electrochemical activities of Fe-based electrode materials are constrained by the oxygen vacancy concentration and oxy-ion transport properties. Herein, PrBaFe_2-xNb_xO_5+δ (PBFNx, x = 0, 0.05, 0.1, 0.15) oxides are synthesized and evaluated as electrodes for symmetrical solid oxide fuel cell (SSOFC). X-ray diffraction (XRD) indicates that PBFNx samples have an orthorhombic structure and good chemical compatibility with electrolyte. Among all the samples, the PBFN0.1 symmetrical half-cell shows the lowest polarization resistance at 800 °C, which decreases by 29.2% compared with that of PBF in air and decreases by 59.9% compared with that of PBF in wet hydrogen atmospheres. The output performance of the single cell with PBFN0.1 as symmetrical electrodes achieves 197.10 mW cm⁻² in wet hydrogen atmospheres at 800 °C, which is an improvement of 31.97% compared with that of PBF. The enhanced electrochemical performance can be attributed to an increase in oxygen vacancy concentrations. The results suggest that the PBFN0.1 material is a potential candidate for SSOFC.

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作为对称固体氧化物燃料电池潜在电极材料的无钴无锶双过氧化物 PrBaFe1.9Nb0.1O5+δ

双过沸石氧化物 PrBaFe2O5+δ (PBF) 因其在空气中卓越的氧还原反应（ORR）活性和在湿氢气氛中出色的稳定性而被视为一种潜在的电极材料。然而，铁基电极材料的电化学活性受到氧空位浓度和氧离子传输特性的限制。本文合成了 PrBaFe2-xNbxO5+δ (PBFNx, x = 0, 0.05, 0.1, 0.15) 氧化物，并对其作为对称固体氧化物燃料电池 (SSOFC) 的电极进行了评估。X 射线衍射（XRD）表明，PBFNx 样品具有正方体结构，与电解质具有良好的化学相容性。在所有样品中，PBFN0.1 对称半电池在 800 °C 时的极化电阻最低，与空气中的 PBF 相比下降了 29.2%，与湿氢气氛中的 PBF 相比下降了 59.9%。在湿氢气氛中，以 PBFN0.1 为对称电极的单电池在 800 ℃ 时的输出性能达到 197.10 mW cm-2，与 PBF 相比提高了 31.97%。电化学性能的提高可归因于氧空位浓度的增加。结果表明，PBFN0.1 材料是 SSOFC 的潜在候选材料。

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来源期刊

Ionics 化学-电化学

CiteScore

5.30

自引率

7.10%

发文量

427

审稿时长

2.2 months

期刊介绍： Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.