Novel Polybenzimidazole-Phosphoric Acid Membranes for Fuel Cell Applications

Autor:	Lakshmi Krishnan, Tracy Chunxin Zhang, Thomas A. Early, Gary William Yeager, Maria Rocco LaTorre
Rok vydání:	2013
Předmět:	chemistry.chemical_compound Membrane chemistry Chemical engineering Fuel cells Phosphoric acid
Zdroj:	ECS Transactions. 50:1179-1191
ISSN:	1938-6737 1938-5862
DOI:	10.1149/05002.1179ecst
Popis:	Polybenzimidazole-phosphoric acid membranes have been used extensively in high temperature fuel cell applications. They are generally prepared either by copolymerization of tetramines and dicarboxylic acids (AA/BB copolymers) or by homopolymerization of diaminoacids (AB homopolymers). We describe the preparation of 4-(3,4-diaminophenylsulfonyl) benzoic acid, a diamino acid useful for the synthesis of novel AB polybenzimidazoles having excellent thermal and thermal-oxidative stability. The polymer, readily cast from polar aprotic solvents, when imbibed with phosphoric acid produces polymer electrolyte membranes exhibiting proton conductivities ranging from 0.06-0.12 S/cm at 80-160 {degree sign}C (20% RH) at a phosphoric acid doping level of 6.1.
Databáze:	OpenAIRE
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