Multi-technique characterization of spray coated and roll-to-roll coated gas diffusion fuel cell electrodes
Multi-technique characterization of spray coated and roll-to-roll coated gas diffusion fuel cell electrodes
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喷涂和卷对卷气体扩散燃料电池电极的多技术表征
DOI：
10.1016/j.jpowsour.2023.232670
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发表时间：
2023
影响因子：
9.2
通讯作者：
Pylypenko, Svitlana
中科院分区：
文献类型：
--
作者：
Medina, Samantha;Foster, Jayson G.;Dzara, Michael J.;Wang, Min;Ulsh, Michael;Mauger, Scott A.;Pylypenko, Svitlana
本工作报告的表征催化剂层（CL）的结构和组成的一组气体扩散电极（GDE）制造的不同的涂层方法的目的是开发一个更好地了解CL加工-结构-性能-性能的关系。本研究中使用的CL涂层技术为超声喷涂和两种卷对卷（R2 R）方法-凹版印刷和狭缝模头。扫描透射电子显微镜（STEM）结合X射线能量色散谱（EDS）分析的GDE横截面提供了大量的信息，而扫描电子显微镜（SEM）与EDS和X射线光电子能谱（XPS）被用来研究近表面和表面组成的CL，将在膜电极组件（MEA）的膜直接接触的构造。本研究表明，常见的量化参数，即从横截面STEM-EDS图和自上而下的CL测量SEM和XPS提取的F：Pt比，沿着与从SEM显微照片量化的粗糙度参数是有用的参数，在解释和潜在的预测性能趋势。此外，它还强调了了解关键CL表面特性对于提高聚合物电解质膜（PEM）技术高性能组件的可制造性的重要性。
This work reports the characterization of catalyst layer (CL) structure and composition for a set of gas-diffusion electrodes (GDEs) fabricated by different coating methods with the goal of developing a better understanding of CL processing-structure-property-performance relationships. The CL coating techniques used in this study were ultrasonic spray coating, and two roll-to-roll (R2R) methods – gravure and slot die. Scanning transmission electron microscopy (STEM) coupled with X-ray energy dispersive spectroscopy (EDS) analysis of GDE cross-sections provided bulk information, while scanning electron microscopy (SEM) with EDS and X-ray photoelectron spectroscopy (XPS) were used to investigate the near surface and surface composition of the CLs that will be in direct contact with the membrane once the membrane electrode assembly (MEA) is constructed. This study demonstrates that common quantification parameters, namely the F:Pt ratio extracted from cross-sectional STEM-EDS maps and top-down CL measurements with SEM and XPS, along with roughness parameters quantified from SEM micrographs are useful parameters in explaining and potentially predicting performance trends. Additionally, it highlights the importance of understanding key CL surface properties for advancing the manufacturability of high-performance components for polymer electrolyte membrane (PEM) technologies.