Pr‐ and Co‐substitution in rare earth nickelates: Application as SOEC air electrodes

IF 2.6 4区工程技术 Q3 ELECTROCHEMISTRY

Fuel Cells Pub Date : 2023-08-28 DOI:10.1002/fuce.202300037

A. Egger, S. Eisbacher‐Lubensky, Kathrin Sampl, V. Subotić, C. Hochenauer, W. Sitte, E. Bucher

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引用次数: 0

Abstract

In this work, fundamental material properties of compounds in the system (La,Pr)2(Ni,Co)O4+δ as well as their performance as air electrodes in solid oxide electrolysis cells were investigated. Nickelates co‐doped with Pr and Co were characterized on a material basis by means of X‐ray diffraction and thermogravimetry. Conductivity and conductivity relaxation measurements were performed in order to obtain the electronic conductivity as well as the chemical surface exchange coefficient and the chemical diffusion coefficient of oxygen as a function of temperature and oxygen partial pressure. These parameters can be regarded as the most essential properties at the material level required to assess the suitability of mixed ionic‐electronic conducting ceramics for application as air electrode in solid oxide cells. The electrode performance of the materials was then tested on fuel electrode‐supported button cells at 800°C. The electrodes were applied by screen‐printing and the effect of varying the Pr‐content and Co‐content of the electrode powder was investigated. Cell tests were performed by means of current‐voltage measurements in electrolysis mode. While no significant impact of Pr‐doping on the investigated material properties was observed, the electrode performance of Pr‐containing materials was significantly better than for the Pr‐free compound, which has been discussed in detail.

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稀土镍酸盐中的Pr和Co取代：用作SOEC空气电极

本文研究了（La，Pr）2（Ni，Co）O4+δ体系中化合物的基本材料性质及其在固体氧化物电解槽中作为空气电极的性能。通过X射线衍射和热重分析，在材料基础上对Pr和co共掺杂的镍化物进行了表征。进行电导率和电导率弛豫测量，以获得作为温度和氧分压函数的电子电导率以及氧的化学表面交换系数和化学扩散系数。这些参数可以被视为评估混合离子-电子导电陶瓷在固体氧化物电池中用作空气电极的适用性所需的材料级别的最基本特性。然后在800°C下，在燃料电极支撑的纽扣电池上测试材料的电极性能。通过丝网印刷施加电极，并研究了电极粉末中Pr含量和Co含量变化的影响。电池测试是通过电解模式下的电流-电压测量进行的。虽然没有观察到Pr掺杂对所研究的材料性能的显著影响，但含Pr材料的电极性能明显优于无Pr化合物的电极性能，这一点已经进行了详细讨论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.