Magnetic field alignment of stable proton-conducting channels in an electrolyte membrane
Magnetic field alignment of stable proton-conducting channels in an electrolyte membrane
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DOI：
10.1038/s41467-019-08622-2
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发表时间：
2019-02-19
影响因子：
16.6
通讯作者：
Guiver, Michael D.
中科院分区：
文献类型：
--
作者：
Liu, Xin;Li, Yi;Guiver, Michael D.
具有短路径通过平面取向的质子传导性的质子交换膜非常适合用于质子交换膜燃料电池。利用磁场在质子交换膜中产生定向结构。以前，这仅通过质子非导电金属氧化物基填料进行。在这里，在强磁场下，基于亚铁氰化物配位聚合物和磷钨酸的质子传导顺磁复合物用于制备具有高传导性的通过平面排列的质子通道的复合膜。令人欣慰的是，这种策略同时克服了磷钨酸在复合膜中的高水溶性，从而防止其浸出和随后的膜电导率损失。配位聚合物中的亚铁氰化物基团，通过氧化还原循环，可以持续消耗自由基，从而有助于改善长期原位膜耐久性。与其他类型的碳氢化合物膜和行业标准的Nafion212相比，该复合膜具有出色的质子传导性、燃料电池性能和耐久性。
Proton exchange membranes with short-pathway through-plane orientated proton conductivity are highly desirable for use in proton exchange membrane fuel cells. Magnetic field is utilized to create oriented structure in proton exchange membranes. Previously, this has only been carried out by proton nonconductive metal oxide-based fillers. Here, under a strong magnetic field, a proton-conducting paramagnetic complex based on ferrocyanide-coordinated polymer and phosphotungstic acid is used to prepare composite membranes with highly conductive through-plane-aligned proton channels. Gratifyingly, this strategy simultaneously overcomes the high water-solubility of phosphotungstic acid in composite membranes, thereby preventing its leaching and the subsequent loss of membrane conductivity. The ferrocyanide groups in the coordinated polymer, via redox cycle, can continuously consume free radicals, thus helping to improve the long-term in situ membrane durability. The composite membranes exhibit outstanding proton conductivity, fuel cell performance and durability, compared with other types of hydrocarbon membranes and industry standard Nafion (R) 212.