A paradigm shift for a new class of proton exchange membranes with ferrocyanide proton-conducting groups providing enhanced oxidative stability
A paradigm shift for a new class of proton exchange membranes with ferrocyanide proton-conducting groups providing enhanced oxidative stability
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新型质子交换膜的范式转变，具有亚铁氰化物质子传导基团，可提供增强的氧化稳定性
DOI：
10.1016/j.memsci.2020.118536
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发表时间：
2020-12
影响因子：
9.5
通讯作者：
Michael D. Guiver
中科院分区：
文献类型：
--
作者：
Xiangwen Zhang;Yi Li;Xin Liu;Junfeng Zhang;Yan Yin;Michael D. Guiver
一种新型质子交换膜（PEM）含有亚铁氰化物基团作为质子传导/自由基清除剂成分。在这里，亚铁氰化物基团键合到商业含氟弹性体聚合物主链上，形成用于质子交换膜燃料电池（PEMFC）的亚铁氰化物配位的PEM（CFC）。即使在离子交换容量较低的 CFC 中，CFC PEM 也表现出比 Nafion 212 膜更大的亲水形态相，这是由于亚铁氰化物基团之间的静电力比传统磺酸基团更强。与Nafion 212相比，CFC膜在水中的质子传导性较差。然而，它们在水中质子传输的活化能要低得多，并且在低相对湿度 (RH) 下比 Nafion 212 表现出更高的质子电导率。这与较大的亲水域有关，亲水域可以为质子传输构建更好连接的通道，特别是在膜水合水平较低的情况下。因此，在低 RH 条件下的 PEMFC 评估中，CFC 膜表现出比 Nafion 212 更好的功率输出。化学加速应力测试（AST）表明，亚铁氰化物基团的自由基清除能力可有效大大减少电化学氧化。
A new class of proton exchange membranes (PEMs) containing ferrocyanide groups as both proton-conducting/radical scavenger components are fabricated. Here, the ferrocyanide groups are bonded to a commercial fluoroelastomer polymer main chain, resulting in ferrocyanide-coordinated PEMs (CFC) for proton exchange membrane fuel cells (PEMFCs). The CFC PEMs show a larger hydrophilic morphological phase than Nafion 212 membrane, even in the CFC having lower ion exchange capacity, owing to stronger electrostatic forces among ferrocyanide groups than traditional sulfonic groups. Compared with Nafion 212, CFC membranes present inferior proton conductivity in water. However, they show much lower activation energy for proton transport in water, and considerably higher proton conductivity than Nafion 212 under low relative humidity (RH). This is related to the larger hydrophilic domains that may construct better-connected channels for proton transport, especially at low membrane hydration levels. As a result, CFC membranes exhibit better power output than Nafion 212 in PEMFC evaluations under low RH conditions. The chemical accelerated stress test (AST) demonstrates that the radical scavenging ability of ferrocyanide group is effective for greatly reducing electrochemical oxidation.
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DOI：
10.1021/j150367a005
发表时间：
1934
期刊：
The Journal of Physical Chemistry
影响因子：
--
作者：
I. Kolthoff;William J. Tomsicek
通讯作者：
I. Kolthoff;William J. Tomsicek
影响因子：
9.5
作者：
Baijun Liu;D. Kim;Jeffrey N. Murphy;G. Robertson;M. Guiver;S. D. Mikhailenko;Serge Kaliaguine;Yi-Ming Sun;Ying-Ling Liu;Juin-Yih Lai
通讯作者：
Baijun Liu;D. Kim;Jeffrey N. Murphy;G. Robertson;M. Guiver;S. D. Mikhailenko;Serge Kaliaguine;Yi-Ming Sun;Ying-Ling Liu;Juin-Yih Lai
影响因子：
19
作者：
G. Titvinidze;K. Kreuer;M. Schuster;C. C. de Araújo-C.;J. Melchior;W. Meyer
通讯作者：
G. Titvinidze;K. Kreuer;M. Schuster;C. C. de Araújo-C.;J. Melchior;W. Meyer
影响因子：
5.9
作者：
K. Wu;Y. R. Wang;W. Hwu
通讯作者：
K. Wu;Y. R. Wang;W. Hwu
影响因子：
--
作者：
Shuang Fan;Y. Luan;Jingjing Wang;Hongyi Gao;Xiaowei Zhang;Ge Wang
通讯作者：
Shuang Fan;Y. Luan;Jingjing Wang;Hongyi Gao;Xiaowei Zhang;Ge Wang