Chemical compatibility of solid oxide fuel cell air electrode Pr4Ni3O10±δ with commercial electrolytes

IF 2.6 4区工程技术 Q3 ELECTROCHEMISTRY

Fuel Cells Pub Date : 2024-04-05 DOI:10.1002/fuce.202300176

V. E. Tagarelli, J. Vega-Castillo, A. Montenegro-Hernández

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引用次数: 0

Abstract

The chemical reactivity between Pr₄Ni₃O_10±δ (3-PNO) electrodes and Y_0.08Zr_0.92O_1.96 (YSZ), Ce_0.9Gd_0.1O_1.95 (GDC), and La_0.9Sr_0.1Ga_0.8Mg_0.2O_2.85 (LSGM) electrolytes was analyzed by electrochemical impedance spectroscopy and X-ray diffraction. 3-PNO powders were synthesized by two different chemical routes, one of them uses hexamethylenetetramine (HMTA) as a complexing agent (route A) while the other citrates (route B). The samples observed by scanning electron microscopy presented different microstructures; route A powders present small submicronic grains with an open microstructure while route B powders are formed by larger well-connected grains. The polarization resistance (R_P) values for 3-PNO/YSZ cells are one order of magnitude higher than those of 3-PNO/GDC and 3-PNO/LSGM cells. The R_P for both cells 3-PNO/GDC and 3-PNO/LSGM and its evolution in time suggest that chemical reactivity takes place during the adhesion treatment and electrochemical measurements. The microstructure plays a crucial role in R_P and the degradation rate; 3-PNO obtained by route A (3-PNO-HMTA) exhibits the best electrochemical performance since these powders present a well-loose morphology and a large exposed area. However, this fact makes them active chemically, so the increase of R_P with time is slower for 3-PNO electrodes prepared by route B (3-PNO-Cit), since the rate of chemical reactivity with the electrolyte is slower.

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固体氧化物燃料电池空气电极 Pr4Ni3O10±δ 与商用电解质的化学相容性

电化学阻抗谱和 X 射线衍射分析了 Pr4Ni3O10±δ (3-PNO) 电极与 Y0.08Zr0.92O1.96 (YSZ)、Ce0.9Gd0.1O1.95 (GDC) 和 La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM) 电解质之间的化学反应性。3-PNO 粉末是通过两种不同的化学方法合成的，其中一种方法使用六亚甲基四胺（HMTA）作为络合剂（方法 A），另一种方法使用柠檬酸盐（方法 B）。扫描电子显微镜观察到的样品呈现出不同的微观结构：A 路线的粉末呈现出具有开放微观结构的小亚微粒，而 B 路线的粉末则由较大的连接良好的晶粒形成。3-PNO/YSZ 电池的极化电阻 (RP) 值比 3-PNO/GDC 和 3-PNO/LSGM 电池高一个数量级。3-PNO/GDC 和 3-PNO/LSGM 电池的极化电阻值及其随时间的变化表明，在粘附处理和电化学测量过程中发生了化学反应。微观结构对 RP 和降解率起着至关重要的作用；通过路线 A 获得的 3-PNO（3-PNO-HMTA）表现出最佳的电化学性能，因为这些粉末具有良好的松散形态和较大的暴露面积。然而，这一事实使它们的化学性质变得活跃，因此通过 B 路制备的 3-PNO 电极（3-PNO-Cit）的 RP 随时间的增长速度较慢，因为它们与电解质的化学反应速度较慢。

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来源期刊

Fuel Cells 工程技术-电化学

CiteScore

5.80

自引率

3.60%

发文量

审稿时长

3.7 months

期刊介绍： This journal is only available online from 2011 onwards. Fuel Cells — From Fundamentals to Systems publishes on all aspects of fuel cells, ranging from their molecular basis to their applications in systems such as power plants, road vehicles and power sources in portables. Fuel Cells is a platform for scientific exchange in a diverse interdisciplinary field. All related work in -chemistry- materials science- physics- chemical engineering- electrical engineering- mechanical engineering- is included. Fuel Cells—From Fundamentals to Systems has an International Editorial Board and Editorial Advisory Board, with each Editor being a renowned expert representing a key discipline in the field from either a distinguished academic institution or one of the globally leading companies. Fuel Cells—From Fundamentals to Systems is designed to meet the needs of scientists and engineers who are actively working in the field. Until now, information on materials, stack technology and system approaches has been dispersed over a number of traditional scientific journals dedicated to classical disciplines such as electrochemistry, materials science or power technology. Fuel Cells—From Fundamentals to Systems concentrates on the publication of peer-reviewed original research papers and reviews.