Synthesis and proton conductivity of thermally stable polymer electrolyte:poly(benzimidazole) complexes with strong acid molecules

Authors
Kawahara, M Morita, J Rikukawa, M Sanui, K Ogata, N
Citation
M. Kawahara et al., Synthesis and proton conductivity of thermally stable polymer electrolyte:poly(benzimidazole) complexes with strong acid molecules, ELECTR ACT, 45(8-9), 2000, pp. 1395-1398
Citations number
18
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
ELECTROCHIMICA ACTA
ISSN journal
00134686 → ACNP
Volume
45
Issue
8-9
Year of publication
2000
Pages
1395 - 1398
Database
ISI
SICI code
0013-4686(2000)45:8-9<1395:SAPCOT>2.0.ZU;2-#
Abstract
We synthesized thermally stable proton-conducting polymers composed of poly (benzimidazole) (PBI) and strong acids. PBI films were doped with strong ac ids such as phosphoric, sulfuric, and hydrochloric acid by immersing them i nto a mixed solution of strong acid and methanol. We found that the PBI fil ms and strong acids formed polymer complexes because they showed the acid-b ase or the hydrogen bonding interactions between imidazole groups of PBI an d acid molecules. The PBI/H3PO4 complexes were thermally stable up to 500 d egrees C, and the proton conductivity of anhydrous complexes reached 10(-5) S cm(-1) at 160 degrees C. (C) 2000 Elsevier Science Ltd. All rights reser ved.