The present work aims to quantify the influence of typical interconnect coatings used for solid oxide fuel cells (SOFC) on area specific resistance (ASR). To quantify the effect of the coating, the dependency of coating thickness on the ASR is examined on Crofer 22 APU at 600 °C. Three different Co coating thicknesses are investigated, 600 nm, 1500 nm, and 3000 nm. Except for the reference samples, the material is pre-oxidized prior to coating to mitigate the outward diffusion of iron and consequent formation of poorly conducting (Co,Fe)₃O₄ spinel. Exposures are carried out at 600 °C in stagnant laboratory air for 500 h and subsequent ASR measurements are performed. Additionally the microstructure is investigated with scanning electron microscopy (SEM). On all pre-oxidized samples, a homogenous dense Co₃O₄ top layer is observed beneath which a thin layer of Cr₂O₃ is present. As the ASR values range between 7 and 12 mΩcm² for all pre-oxidized samples, even though different Co₃O₄ thicknesses are observed, the results strongly suggest that for most applicable cases the impact of the coating on ASR is negligible and the main contributor is Cr₂O₃.

本工作旨在量化用于固体氧化物燃料电池（SOFC）的典型互连涂层对面积比电阻（ASR）的影响。为了量化涂层的效果，在600°C的Crofer 22 APU上检查了涂层厚度对ASR的依赖性。研究了三种不同的Co涂层厚度：600 nm，1500 nm和3000 nm。除参比样品外，在涂覆之前先对材料进行预氧化，以减轻铁的向外扩散以及由此形成的导电性较差的（Co，Fe）₃ O _{4的形成。}尖晶石。在600℃的实验室空气中暴露500小时，然后进行ASR测量。另外，用扫描电子显微镜（SEM）研究了微观结构。在所有预氧化样品上，均质致密的Co ₃ O ₄顶层被观察到，在其下存在Cr ₂ O ₃薄层。由于ASR值范围7和12之间mΩcm ²对于所有预氧化的样品，即使不同的共₃ ö _4层厚度观察到的，结果强烈表明为最适用的情况下对ASR的涂层的影响是可以忽略不计和主贡献者是Cr ₂ O ₃。