Enhancing Proton Conductivity and Durability of Crosslinked PBI-Based High-Temperature PEM: Effectively Doping a Novel Cerium Triphosphonic-isocyanurate
Enhancing Proton Conductivity and Durability of Crosslinked PBI-Based High-Temperature PEM: Effectively Doping a Novel Cerium Triphosphonic-isocyanurate
复制标题
提高交联 PBI 高温质子交换膜的质子电导率和耐久性：有效掺杂新型三膦酸异氰脲酸铈
DOI：
10.1149/1945-7111/abe290
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发表时间：
2021-02-01
影响因子：
3.9
通讯作者：
Hui, Hongsen
中科院分区：
文献类型：
--
作者：
Guo, Hui;Li, Zhongfang;Hui, Hongsen
酸掺杂是提高高温聚苯并咪唑（PBI）质子交换膜（HTPEMs）质子传导性能的有效途径。为了克服酸从膜中浸出的问题，合成了三膦酸-异氰脲酸铈（Ce-TOPT）质子导体并将其掺杂到交联的PBI骨架（c-mPBI）中。TOPT有机化合物含有三个-PO 3 H2基团，其可以与高价金属离子（Ce 4 +/3+、Zr 4+、Fe 3+）络合以确保其不溶于水。Ce-TOPT（1：2）表现出高离子交换容量（IEC，高达2.2meq. g（-1））和良好的热稳定性。有机-无机Ce-TOPT在c-mPBI/CeTOPT膜中显示出高掺杂水平，因此在高温和低相对湿度（RH）下膜的质子传导率高。在180 ℃下，c-mPBI/CeTOPT（50）在100%RH、50%RH和无水条件下的电导率分别达到0.125、0.0885和0.0363 S cm（-1）。水洗48 h后，c-mPBI/CeTOPT（50）的质子电导率损失为4.6%。Ce-TOPT掺杂的交联PBI基膜具有良好的机械性能、质子传导性、耐久性和膜选择性，是一种潜在的HTPEM候选材料。
Acid doping is an effective way to enhance the proton conduction of high temperature polybenzimidazole (PBI) based proton exchange membranes (HTPEMs). To overcome the problem of acid leaching from the membranes, a cerium triphosphonic-isocyanurate (Ce-TOPT) proton conductor was synthesized and doped into a crosslinked PBI backbone (c-mPBI). The TOPT organic compound contains three -PO3H2 groups, which can be complexed with high valent metal ions (Ce4+/3+, Zr4+, Fe3+) to ensure its water-insolubility. Ce-TOPT(1:2) exhibited high ion exchange capacity (IEC, up to 2.2 meq. g(-1)) and good thermal stability. The organic-inorganic Ce-TOPT shown a high doping level in c-mPBI/CeTOPT membranes and consequently high proton conductivity of the membranes at high temperature and low relative humidity (RH). At 180 degrees C, the conductivity of c-mPBI/CeTOPT(50) could reach 0.125, 0.0885 and 0.0363 S cm(-1) at 100% RH, 50% RH and anhydrous conditions, respectively. After water-washing for 48 h, the proton conductivity loss of c-mPBI/CeTOPT(50) was 4.6%. The good mechanical properties, proton conductivity, durability and membrane selectivity indicate that the crosslinked PBI-based membrane doped with Ce-TOPT is a potential candidate as HTPEMs.