Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, PR China.
ChemSusChem. 2012 May;5(5):896-900. doi: 10.1002/cssc.201100725. Epub 2012 Apr 23.
Herein, poly[2,2'-(p-oxydiphenylene)-5,5'-benzimidazole] (PBI) is synthesized from 3,3'-diaminobenzidine and 4,4'-oxybisbenzoic acid, and the membrane is prepared by solvent casting. The main characteristics of PBI are studied. In the preparation of the PBI/H(3) PO(4) composite membrane, the absorbing temperature of H(3) PO(4) is 120 °C, which leads to a membrane with a high content of H(3) PO(4) . Membrane electrode assemblies (MEAs) are fabricated from PBI/H(3) PO(4) membranes with the catalyst layer made of Pt/C, PBI, and polyvinylidene fluoride (230:12:7 w/w). The fabricated MEA is tested at 150 °C with dry hydrogen and oxygen gas at 0.2 MPa for both anode and cathode feeds. No degradation of voltage is seen during stability testing of the PBI/H(3) PO(4) membrane at a constant current for 100 h. The maximum power density is 1.17 W cm(-2) , and the maximum current density is 6.0 A cm(-2) with a Pt loading of 0.5 mg cm(-2) . The high performance of these membrane materials demonstrates that PBI can be regarded as an alternative membrane material for high-temperature proton-exchange-membrane fuel cells.
本文采用 3,3'-二氨基联苯胺和 4,4'-氧二苯甲酸合成了聚2,2'-(对氧二苯)-5,5'-联苯咪唑，并通过溶剂浇铸法制备了膜。研究了 PBI 的主要特性。在制备 PBI/H3PO4 复合膜的过程中，H3PO4 的吸收温度为 120°C，导致膜中 H3PO4 的含量较高。膜电极组件(MEA)由 Pt/C、PBI 和聚偏二氟乙烯(230:12:7 w/w)制成的催化剂层的 PBI/H3PO4 膜制成。在 150°C 下，以 0.2 MPa 的压力向阳极和阴极进料的干燥氢气和氧气对制造的 MEA 进行测试。在 100 小时的恒流稳定性测试中，PBI/H3PO4 膜的电压没有下降。最大功率密度为 1.17 W cm(-2)，Pt 负载量为 0.5 mg cm(-2)时，最大电流密度为 6.0 A cm(-2)。这些膜材料的高性能表明，PBI 可以作为高温质子交换膜燃料电池的替代膜材料。
