The effects of sintering temperature and current contacting layer on the performance of lanthanum nickelate electrodes in Solid Oxide Fuel Cells

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL

Solid State Ionics Pub Date : 2023-10-24 DOI:10.1016/j.ssi.2023.116386

C.M. Harrison , B.J.M. Sarruf , D. Klotz , P.R. Slater , R. Steinberger-Wilckens

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Abstract

The Ruddlesden-Popper phase La₂NiO_4+δ (LNO214) has received a significant level of research attention with respect to its employment as a Solid Oxide Fuel Cell cathode material. However, it is known that there are many factors that are capable of influencing the performance of this phase when utilised in this role. One such factor that can impact on electrode behaviour is the choice of sintering temperature. In this paper, a study of this effect is detailed. This is achieved via the use of both symmetrical and single cell testing configurations, with additional investigation provided by ex-situ analysis. It is shown that a sizeable improvement in electrode performance can be achieved via an increase in sintering temperature. This is despite observations on the reactivity between LNO214 and the contact electrolyte material Ce_0.9Gd_0.1O_2-δ. Further, it is also demonstrated that the addition of a noble metal contacting layer can dramatically improve the performance of an LNO214 electrode. In comparison, the impact of a contacting layer on a state-of-the-art La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ composition is shown to be relatively minor. This has implications towards SOFC testing methodologies given the widespread employment of noble metal contacting pastes.

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烧结温度和电流接触层对固体氧化物燃料电池中镍酸镧电极性能的影响

Ruddlesden Popper相La2NiO4+δ（LNO214）作为固体氧化物燃料电池阴极材料受到了高度的研究关注。然而，众所周知，在担任这一角色时，有许多因素能够影响这一阶段的表现。可以影响电极行为的一个这样的因素是烧结温度的选择。本文对这种效应进行了详细的研究。这是通过使用对称和单电池测试配置来实现的，并通过非原位分析提供额外的研究。结果表明，通过提高烧结温度可以显著提高电极性能。尽管对LNO214和接触电解质材料Ce0.9Gd0.1O2-δ之间的反应性进行了观察。此外，还证明了添加贵金属接触层可以显著提高LNO214电极的性能。相比之下，接触层对最先进的La0.6Sr0.4Co0.2Fe0.8O3-δ成分的影响相对较小。鉴于贵金属接触浆料的广泛使用，这对SOFC测试方法具有启示意义。

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

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.