Development of high-performance roll-to-roll-coated gas-diffusion-electrode-based fuel cells
Development of high-performance roll-to-roll-coated gas-diffusion-electrode-based fuel cells
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DOI：
10.1016/j.jpowsour.2021.230039
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发表时间：
2021-06-07
影响因子：
9.2
通讯作者：
Ulsh, Michael
中科院分区：
文献类型：
--
作者：
Mauger, Scott A.;Wang, Min;Ulsh, Michael
本研究的重点是确定制造条件，以创建高性能的卷到卷涂覆（R2Rcoated）的气体扩散电极（GDE）的质子交换膜燃料电池（PEMFC）。在这里，我们研究了工艺条件如何影响离聚物在电极中的分布，这对高性能至关重要。使用开尔文探针，X射线光电子能谱，和纳米级的X射线计算机断层扫描的组合，我们表明，形成的离聚物丰富的表面促进使用较高的干燥速率。我们表明，R2R涂覆的GDE具有比喷涂的GDE更高的表面离聚物浓度，这使得这些R2R涂覆的GDE不需要额外的离聚物覆盖层，这通常是喷涂的GDE的情况。这将减少加工步骤的数量并降低制造环境中的材料成本。这项工作表明，通过适当选择材料，油墨配方和加工条件，直接涂覆GDE是燃料电池制造的可行途径。
This study focuses on determining fabrication conditions to create high-performance roll-to-roll-coated (R2Rcoated) gas-diffusion electrodes (GDEs) for proton-exchange-membrane fuel cells (PEMFCs). Here, we examine how process conditions influence the distribution of ionomer in the electrode, which is shown to be critical for high performance. Using a combination of Kelvin probe, X-ray photoelectron spectroscopy, and nano-scale X-ray computed tomography we show that formation of an ionomer-rich surface is promoted by using a higher drying rate. We show that R2R-coated GDEs have higher surface ionomer concentration than spray-coated GDEs, which enables these R2R-coated GDEs to not need an additional ionomer overlayer, as is typically the case for spraycoated GDEs. This will reduce the number of processing steps and lower material costs in a manufacturing setting. This work shows that with the appropriate selection of materials, ink formulation, and processing conditions, direct-coated GDEs are a viable pathway for fuel cell manufacturing.