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Towards a Fundamental Understanding of the Cathode Degradation Mechanisms

机译：对阴极降解机制的基本了解

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While impressive solid oxide fuel cell (SOFC) performance has been achieved, durability under "real world" conditions is still an issue for commercial deployment. In particular cathode exposure to H_2O and CO_2 can result in long-term performance degradation issues. Therefore, we have embarked on a multi-faceted fundamental investigation of the effect of these contaminants on cathode degradation mechanisms in order to establish cathode composition/structures and operational conditions to enhance cathode durability. Using a Focused Ion Beam (FIB)/SEM we are quantifying in 3-D the microstructural changes of the cathode before and after the onset of cathode performance degradation. This includes changes in TPB density, phase-connectivity, and tortuosity, as well as tertiary phase formation. This is then linked to heterogeneous catalysis methods to elucidate the cathode oxygen reduction reaction (ORR) mechanism to determine how H_2O and CO_2 affect the ORR as a function of temperature, time, and composition. By use of in-situ ~(18)O-isotope exchange of labeled contaminants we are investigating whether oxygen incorporated in the lattice of LSM and LSCF, and their composites with YSZ and GDC, respectively, originated from ambient O_2 or the contaminant, as well as intermediate adsorbed species and mechanisms that lead to degradation. The results will be used to develop a cohesive and overarching theory that explains the microstructural and compositional cathode performance degradation mechanisms.
机译：尽管已经实现了令人印象深刻的固体氧化物燃料电池（SOFC）性能，但是在“现实世界”条件下的耐用性仍然是商业部署的问题。特别是阴极暴露于H_2O和CO_2会导致长期性能下降问题。因此，我们已着手对这些污染物对阴极降解机理的影响进行了多方面的基础研究，以建立阴极组成/结构和操作条件以增强阴极耐久性。我们使用聚焦离子束（FIB）/ SEM在3-D中量化了阴极性能下降开始之前和之后阴极的微观结构变化。这包括TPB密度，相连接性和曲折度以及第三相形成的变化。然后将其与非均相催化方法联系起来，以阐明阴极氧还原反应（ORR）的机制，以确定H_2O和CO_2如何随温度，时间和组成的变化影响ORR。通过使用标记污染物的原位〜（18）O同位素交换，我们研究了掺入LSM和LSCF以及它们分别与YSZ和GDC的复合物中的氧是否源自环境O_2或污染物以及导致降解的中间吸附物质和机理。该结果将用于发展一种凝聚力和总体理论，该理论解释了微观结构和组成阴极性能下降的机理。

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  • 会议地点 Orlando FL(US)
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    Eric D. Wachsman; Yi-Lin Huang; Christopher Pellegrinelli; Joshua A. Taillon; Lourdes G. Salamanca-Riba;

  • 作者单位

    University of Maryland Energy Research Center University of Maryland, College Park, MD, 20742;

    University of Maryland Energy Research Center University of Maryland, College Park, MD, 20742;

    University of Maryland Energy Research Center University of Maryland, College Park, MD, 20742;

    University of Maryland Energy Research Center University of Maryland, College Park, MD, 20742;

    University of Maryland Energy Research Center University of Maryland, College Park, MD, 20742;

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