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UV-crosslinkable anthracene-based ionomer derived gas “Expressway” for anion exchange membrane fuel cells
Journal of Materials Chemistry A ( IF 11.9 ) Pub Date : 2022-06-09 , DOI: 10.1039/d2ta02632e
Bowen Wang, Ji Pan, Xiuyang Zou, Junliang Zhao, Guodong Xu, Zhiyu Jin, Zhe Sun, Feng Yan

The ionomer binder is crucial for the preparation of homogeneous catalyst layers for anion exchange membrane fuel cells (AEMFCs). However, the dense stacking of the ionomer on the catalyst surface results in large resistance to gas (especially O2) penetration in the three-phase boundary (TPB). Here, an in situ UV-driven gas “expressway” for the catalyst layer of AEMFCs was prepared by a rigid anthracene-based cross-linkable ionomer. The gas permeability of the catalyst layer was increased by 130% after crosslinking due to the high free volume between the ionomer chain segments. Meanwhile, the electrochemical and identical location transmission electron microscopy (IL-TEM) characterizations showed that the crosslinked ionomer binders played an anchoring role for the catalyst particles. The performance of an H2/O2 AEMFC (based on commercialized FAA-3-50 membranes) containing the crosslinked ionomer is much better than that of the uncrosslinked PPOAN ionomer. The in situ UV-driven crosslinking strategy of catalyst layers provides new insights into the preparation of homogeneous mesoscopic structures for the catalyst particles. More importantly, the rigid anthracene-based crosslinked structure constructs microscopic gas channels in the ionomer–catalyst interface, which has been overlooked in previous work.

中文翻译:

用于阴离子交换膜燃料电池的紫外交联蒽基离聚物衍生气体“高速公路”

离聚物粘合剂对于制备用于阴离子交换膜燃料电池 (AEMFC) 的均相催化剂层至关重要。然而,离聚物在催化剂表面的密集堆积导致气体(尤其是O 2)在三相边界(TPB)中的渗透阻力很大。在这里,一个原地用于 AEMFC 催化剂层的紫外驱动气体“高速公路”由刚性蒽基可交联离聚物制备。由于离聚物链段之间的高自由体积,交联后催化剂层的透气性增加了 130%。同时,电化学和同位透射电子显微镜(IL-TEM)表征表明,交联的离聚物粘合剂对催化剂颗粒起锚定作用。含有交联离聚物的 H 2 /O 2 AEMFC(基于商业化的 FAA-3-50 膜)的性能远优于未交联的 PPOAN 离聚物的性能。现场催化剂层的紫外驱动交联策略为制备催化剂颗粒的均匀介观结构提供了新的见解。更重要的是,刚性蒽基交联结构在离聚物-催化剂界面中构建了微观气体通道,这在以前的工作中被忽视了。
更新日期:2022-06-14
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