Aging gracefully? Investigating iridium oxide ink's impact on microstructure, catalyst/ionomer interface, and PEMWE performance
Aging gracefully? Investigating iridium oxide ink's impact on microstructure, catalyst/ionomer interface, and PEMWE performance
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DOI：
10.1016/j.jpowsour.2023.233503
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发表时间：
2023-08-17
影响因子：
9.2
通讯作者：
Serov, Alexey
中科院分区：
文献类型：
--
作者：
Lyu, Xiang;Foster, Jayson;Serov, Alexey
在这项研究中，我们进行了一个彻底的调查的影响，老化氧化铱（IrO 2）全氟磺酸离聚物油墨长达14天的油墨和所得的催化剂层的性能。我们研究了油墨性质，如zeta电位，动态光散射（DLS），密度，表面张力和流变性，作为油墨老化时间的函数。采用透射电子显微镜（TEM）、X射线散射和X射线光电子能谱（XPS）技术对催化剂/离聚物界面的微观结构进行了表征。此外，我们评估了墨水老化对质子交换膜水电解槽（PEMWEs）性能的影响。我们的研究结果表明，大多数油墨性能保持稳定14天。PEMWE电池性能的变化是最小的，并且没有观察到与油墨老化时间相关的明显趋势。该研究表明，油墨老化14天对油墨性质、催化剂层结构、催化剂/离聚物界面和PEMWE性能的影响可忽略不计，这表明在油墨制备后有相当长的时间窗口，其性质没有任何显著变化。这些见解为墨水的商业生产和涂布工艺提供了重要指导，这对于扩大PEM技术以满足未来需求是必要的。
In this study, we conducted a thorough investigation of the impact of aging iridium oxide (IrO2) perfluorosulfonic acid ionomer ink for up to 14 days on the properties of the ink and the resulting catalyst layers. We examined ink properties, such as zeta potential, dynamic light scattering (DLS), density, surface tension, and rheology, as functions of ink aging time. To evaluate the microstructure and catalyst/ionomer interface, we employed transmission electron microscopy (TEM), X-ray scattering, and X-ray photoelectron spectroscopy (XPS) tech-niques. Furthermore, we assessed the effect of ink aging on the performance of proton exchange membrane water electrolyzers (PEMWEs). Our findings reveal that most ink properties remain stable for 14 days. The variations in PEMWE cell performance are minimal, and no clear trend is observed in relation to ink aging time. This study demonstrates that the effects of aging the inks for 14 days on ink properties, catalyst layer structure, catalyst/ ionomer interface, and PEMWE performance are negligible, indicating a substantial time window after ink preparation without any significant changes in its properties. These insights provide crucial guidance for the commercial production and coating processes of ink, which is necessary for scaling up PEM technologies to meet future demand.