An Epoxy‐Free Sample Preparation Approach to Enable Imaging of Ionomer and Carbon in Polymer Electrolyte Membrane Fuel Cells
An Epoxy‐Free Sample Preparation Approach to Enable Imaging of Ionomer and Carbon in Polymer Electrolyte Membrane Fuel Cells
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一种能够对聚合物电解质膜燃料电池中的离聚物和碳进行成像的无环氧样品制备方法
DOI：
10.1002/adfm.202209733
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发表时间：
2022
影响因子：
19
通讯作者：
Jankovic, Jasna
中科院分区：
文献类型：
--
作者：
Soleymani, Amir Peyman;Reid, Marcia;Jankovic, Jasna
质子交换膜燃料电池（PEMFC）作为最有前途的零排放发电技术之一，其电极的性能和耐久性取决于其组分-金属催化剂、碳载体和离聚物的组成、微观结构和分布。它们的改进需要深入了解电极的结构-性质-性能关系，透射电子显微镜（TEM）是一个非常宝贵的工具。然而，传统的TEM样品制备，即环氧树脂包埋超微切片，在离聚物成像和将其与碳区分方面存在障碍。因此，在本研究中，对寿命开始（BOL）和寿命结束（EOL）的PEMFC样品实施了无环氧树脂超薄切片机技术。TEM和电子断层扫描-TEM图像首次揭示了BOL中离聚物网络、碳颗粒结构和Pt分布的迷人细节，以及电池降解后它们的结构变化。最后，结构描述符，由专有的量化方法提取，与视觉观察。
Performance and durability of electrodes in proton exchange membrane fuel cells (PEMFCs), as one of the most promising zero‐emission power generation technologies, depend on the composition, microstructure, and distribution of its components—metal catalyst, carbon support, and ionomer. Their improvement requires an in‐depth understanding of the electrodes’ structure‐property‐performance relationship, for which transmission electron microscopy (TEM) has been an invaluable tool. However, the conventional TEM sample preparation, namely epoxy‐embedding ultramicrotomy, poses impediments in imaging ionomer and distinguishing it from carbon. Therefore, in this research, an epoxy‐free ultramicrotome technique is implemented on beginning‐of‐life (BOL) and end‐of‐life (EOL) PEMFC samples. For the first time, TEM and electron tomography‐TEM images reveals fascinating details of the ionomer network, carbon particles’ structure, and Pt distribution in BOL, as well as their structural changes after the cell degradation. Finally, the structural descriptors, extracted by a proprietary quantification method, are correlated with visual observations.
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影响因子：
2
作者：
Watanabe, M;Williams, DB
通讯作者：
Williams, DB
加速应力测试中碳载体特性对燃料电池耐久性的影响
影响因子：
3.9
作者：
Chunmei Wang;M. Ricketts;A. Soleymani;J. Jankovic;James Waldecker;Jixin Chen
通讯作者：
Jixin Chen
影响因子：
4.2
作者：
Yakovlev S;Balsara NP;Downing KH
通讯作者：
Downing KH
PEMFC 稳态运行后的膜和活性层退化 II。
影响因子：
3.9
作者：
C. Iojoiu;E. Guilminot;F. Maillard;M. Chatenet;Jean‐Yves Sanchez;E. Claude;E. Rossinot
通讯作者：
E. Rossinot
影响因子：
3.9
作者：
Chunmei Wang;M. Ricketts;A. Soleymani;J. Jankovic;James Waldecker;Jixin Chen;Chunchuan Xu
通讯作者：
Chunmei Wang;M. Ricketts;A. Soleymani;J. Jankovic;James Waldecker;Jixin Chen;Chunchuan Xu