Synthesis and characterisation of poly[2,2-(m-phenylene)-5,5-bibenzimidazole] as polymer electrolyte membrane for high temperature PEMFCs

被引：189

作者：

Lobato, J. ^{[1
]}

Canizares, P. ^{[1
]}

Rodrigo, M. A. ^{[1
]}

Linares, J. J. ^{[1
]}

Manjavacas, G. ^{[1
]}

机构：

[1] Fac Chem, Dept Chem Engn, E-13071 Ciudad Real, Spain

来源：

JOURNAL OF MEMBRANE SCIENCE | 2006年 / 280卷 / 1-2期

关键词：

PBI; synthesis; membrane characterisation; PEMFC;

D O I：

10.1016/j.memsci.2006.01.049

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Intermediate-high molecular weight poly [2,2-(m-phenylene)-5,5-bibenzimidazole] has been produced by mixing 3,3',4,4'-tetraminobiphenyl and isophthalic acid in polyphosphoric acid as polycondensing agent and triphenyl phosphite as catalyst. Polymers with intrinsic viscosities close to I were measured in 97% sulphuric acid. Membranes were prepared by solution casting and subsequently immersed in phosphoric acid in order to gain ionic conductivity. These membranes were characterised by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analyses, methanol permeation and conductivity measurements. Levels of acid and water absorbed by the membranes were measured and the kinetic of this process was studied. Finally, doped membranes were tested in an actual fuel cell setup, obtaining also information about gases crossover from the open circuit potential. Acceptably reproducible molecular weights between 115,000 and 190,000 were obtained allowing the casting of mechanically stable membranes, which showed a great affinity towards phosphoric acid, high thermal stability, and a conductivity of 0.039 S/cm at 190 degrees C with the membrane equilibrated in saturated air at 60 degrees C. Open circuit potential of a PBI membrane was 0.99 V, close to those of commercial perfluorinated membranes. A H-2/O-2 fuel cell with dry gases was able to produce a maximum power output of 0.22 W/cm(2) at 175 degrees C. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：351 / 362

页数：12

共 47 条

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