Abstract
Recently, we reported the use of phosphoric acid-doped polybenzimidazole (PBI) membrane as a solid polymer electrolyte for fuel cell applications. The advantages of PBI include: (i), good protonic conductivity at elevated temperatures; (ii), near zero electro-osmotic drag, which means that the proton transport through the PBI membrane does not involve water transport, (iii), low gas permeability, and (iv) low methanol crossover. The purpose of this paper is to present details of polymer processing and methods used to cast acid doped PBI films. Also, we will report and compare the electrical and mechanical properties of these films. A second PBI-like polymer synthesized in our laboratory is introduced with some preliminary characterization that indicates promise for fuel cell applications.
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