Characterization of Agglomerated Particles in a PEFC Electrode Slurry by Soft X-ray Radiography
Characterization of Agglomerated Particles in a PEFC Electrode Slurry by Soft X-ray Radiography
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通过软 X 射线照相表征 PEFC 电极浆料中的团聚颗粒
DOI：
10.1149/10408.0197ecst
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
S. Tsushima
中科院分区：
文献类型：
--
作者：
Y. Tokunaga;T. Suzuki;S. Tsushima
控制聚合物电解质燃料电池（pefc）催化剂层的多孔结构是提高电池性能的重要挑战之一。分散的颗粒在电极浆料（催化剂油墨）中聚集并影响催化剂层的制造过程和由此产生的多孔结构。因此，有必要彻底了解电极浆料中颗粒的状态。在本研究中，我们利用软x射线成像系统对电极浆料进行了时间序列可视化，以阐明电极浆料中颗粒的聚集/分散状态和迁移现象。我们制备了四种不同非挥发比的电极浆料进行观察。在所有电极浆料中观察了团聚颗粒的沉降行为。沉降速率随不挥发比的增大而减小。根据捕获的图像估计团聚颗粒的有效密度。
Controlling the porous structure of the catalyst layer in polymer electrolyte fuel cells (PEFCs) is one of the important challenges to improve the cell performance. Dispersed particles in the electrode slurry (catalyst ink) agglomerate and affect both the fabrication process of the catalyst layers and the resultant porous structure. Therefore, it is necessary to thoroughly understand the state of particles in electrode slurry. In this study, we carried out a timeseries visualization of the electrode slurry by a soft X-ray radiography system to clarify the agglomeration/dispersion state and migration phenomena of particles in the electrode slurry. We prepared four types of electrode slurries with different non-volatile ratios for observation. Sedimentation behaviors of the agglomerated particles were observed in all electrode slurries. The sedimentation rate decreased with the increase of non-volatile ratio. The effective density of the agglomerated particles was estimated from captured images.