Tailoring of microstructural evolution in impregnated SOFC electrodes

浸渍 SOFC 电极微观结构演变的定制

• 批准号: EP/M014304/1
• 负责人: John Irvine
• 金额: $ 156.68万
• 依托单位: University of St Andrews
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2015
• 资助国家: 英国
• 起止时间: 2015 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FM014304%2F1
• 关键词: Tailoring; microstructural; evolution; impregnated; SOFC

Solid oxide fuel cells are highly intricate devices with many interfaces which are typically formed at high temperatures. This places many constraints in terms of chemical and physical compatibility upon such devices limiting both performance and durability. Such problems strongly restrict materials choice and impose significant cost penalties on SOFC manufacture. The utilisation of solution methods to introduce part of the SOFCs active constituents is a highly attractive approach that has gained much interest in recent years. This can involve infiltration of nanoparticles or impregnation of precursor solutions to form phases in situ. Much lower reaction temperatures can be utilised avoiding problems with compatibility and affording wider materials choice. Typically such process involves formation of a scaffold structure by high temperature processing and then impregnation of an electrode by lower temperature methods. We have successfully applied this approach to three different novel variants of SOFC architectures. These are electrolyte supported oxide anodes, oxide anode supported and metal anode supported cells. Excellent performances can be obtained and good redox properties demonstrated; however, progress needs to be made to ensure high durability. The impregnates tend to form well dispersed nanoparticles, but these might be expected to agglomerate over time, in fuel cell operating conditions, to reduce overall performance. Through the national and European projects where we applied the impregnation concept, we have learned much about impregnation and how to develop appropriately dispersed electrode structures. The electrode structure is seen to evolve with use and clear opportunities exist to optimise structures through improved processing. Most important has been the realisation that there are strong interplays between the materials impregnated, the substrate and the solvent utilised. Even subtle changes in electrode composition, demand significant changes in impregnation chemistry to maintain the maximum levels of performance. In this project we seek to further develop control of this impregnation chemistry and hence to develop generic methods for developing controlled microstructures via solution routes across several platforms. These new chemistries will be applied to electrolyte- and anode-supported SOFC geometries and properties optimised for performance, durability and redox tolerance. The overall objective is to develop and demonstrate this new approach as one that can be successfully applied to manufacture of fuel cells that combine high performance with durability and resistance to contaminants. We will apply this approach typically for an impregnated oxide electrode with metallic catalyst to zirconia, strontium titanate and metal supports and develop our understanding of the fundamental chemistry across this range of platforms. By so doing we will develop methodologies to tailor impregnations over a broad range of composition space. Studies of performance, durability and resistance to contaminants utilising electrochemical, spectroscopic and microstructural techniques will be used to inform choice of impregnate systems. Final outcomes will be delivery of novel tailored chemistries for different SOFC application modes and geometries, demonstration of novel cell technologies with robust, high performance characteristics at SOFC developer ready scales and development of new routes and instrumentation for SOFC manufacture.

固体氧化物燃料电池是一种高度复杂的装置，具有许多界面，通常在高温下形成。这在化学和物理兼容性方面对这种设备施加了许多限制，限制了性能和耐用性。这些问题强烈地限制了材料的选择，并对SOFC的制造造成了巨大的成本损失。利用溶液方法引入部分SOFC活性成分是一种极具吸引力的方法，近年来引起了人们的极大兴趣。这可能涉及纳米颗粒的渗透或前体溶液的浸渍以在原位形成相。可以利用更低的反应温度，避免了兼容性问题，并提供了更广泛的材料选择。通常，这种工艺包括通过高温处理形成支架结构，然后通过较低温度的方法浸渍电极。我们已经成功地将这种方法应用于SOFC架构的三种不同的新变种。它们是电解液支持的氧化物阳极、氧化物阳极支持的电池和金属阳极支持的电池。可以获得优异的性能，表现出良好的氧化还原性能，但需要取得进展，以确保高耐久性。浸渍物倾向于形成分散良好的纳米颗粒，但在燃料电池的运行条件下，随着时间的推移，这些纳米颗粒可能会聚集在一起，从而降低整体性能。通过我们应用浸渍概念的国家和欧洲项目，我们学到了很多关于浸渍以及如何开发适当分散电极结构的知识。电极结构被认为是随着使用而演变的，显然存在通过改进工艺来优化结构的机会。最重要的是认识到，浸渍的材料、基材和所使用的溶剂之间存在着很强的相互作用。即使是电极成分的细微变化，也要求浸渍化学成分发生重大变化，以保持最高水平的性能。在这个项目中，我们寻求进一步开发对这种浸渍化学的控制，从而开发通过跨越几个平台的溶液路线来开发受控微结构的通用方法。这些新的化学成分将应用于电解液和阳极支持的SOFC几何结构和性能，优化了性能、耐用性和氧化还原耐受性。总的目标是开发和展示这种新的方法，作为一种可以成功地应用于燃料电池制造的方法，这种燃料电池结合了高性能、耐用性和抗污染能力。我们将典型地将这种方法应用于带有金属催化剂的浸渍氧化物电极，以用于氧化锆、钛酸锶和金属载体，并在这一系列平台上发展我们对基础化学的理解。通过这样做，我们将开发方法，以量身定做广泛的合成空间的浸渍。将利用电化学、光谱和微观结构技术对浸渍系统的性能、耐久性和抗污染性进行研究，为浸渍系统的选择提供信息。最终成果将是为不同的SOFC应用模式和几何形状提供新的量身定做的化学产品，在SOFC开发商准备好的规模上展示具有坚固、高性能特征的新型电池技术，并为SOFC制造开发新的路线和仪器。

项目成果

Development of Tailored Porous Microstructures for Infiltrated Catalyst Electrodes by Aqueous Tape Casting Methods

通过水流带铸造方法开发用于渗透催化剂电极的定制多孔微结构

• DOI: 10.1149/06801.2047ecst
• 发表时间: 2015
• 期刊: ECS Transactions
• 作者: Cassidy M

Evaluation of inkjet-printed spinel coatings on standard and surface nitrided ferritic stainless steels for interconnect application in solid oxide fuel cell devices

• DOI: 10.1016/j.ceramint.2022.04.003
• 发表时间: 2022-04
• 期刊: Ceramics International
• 影响因子: 5.2
• 作者: S. Pandiyan;M. Bianco;A. El-kharouf;R. Tomov;R. Steinberger‐Wilckens

Infiltration of commercially available, anode supported SOFC's via inkjet printing

通过喷墨印刷渗透市售阳极支持的 SOFC

• DOI: 10.17863/cam.9678
• 发表时间: 2017
• 作者: Mitchell-Williams T