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Título

Sulfonated poly(2,5-benzimidazole) (SABPBI) impregnated with phosphoric acid as proton conducting membranes for polymer electrolyte fuel cells

AutorAsensio, Juan Antonio; Borrós, Salvador; Gómez-Romero, P.
Palabras claveProton-conducting membranes
Polybenzimidazole
ABPBI
Sulfonated polybenzimidazoleI
Fecha de publicación24-jun-2004
EditorElsevier
CitaciónElectrochimica Acta 49(25): 4461–4466 (2004)
ResumenPreviously cast ABPBI membranes were sulfonated by doping with sulfuric acid followed by heat treatment at 450 .C for 5 min in air. Sulfonation degrees between 35 and 49% of the benzimidazole rings were achieved. The resulting SABPBI membranes were impregnated with phosphoric acid (H3PO4 85%/H2O, 70:30 bath). For concentrated phosphoric acid baths (above 65%), the capacity of these membranes for phosphoric acid uptake (and consequently also their conductivity) increased with the degree of sulfonation. Sulfonated and acid doped SABPBI membranes were characterized in terms of degree of sulfonation, thermal stability (TGA), X-ray diffraction, FTIR spectroscopy and proton conductivity in the dry state, and compared with phosphoric acid impregnated ABPBI studied earlier. The maximum conductivity measured in dry conditions was 3.5 ~ 10.2 S cm.2 at 185 .C for SABPBI E4.6H3PO4 (with a degree of sulfonation of 41%) which compares favorably with non-sulfonated ABPBI and makes feasible their application in PEM Fuel Cells working at temperatures of 150.200 .C. c 2004 Elsevier Ltd. All rights reserved.
Versión del editorhttp://dx.doi.org/10.1016/j.electacta.2004.05.002
URIhttp://hdl.handle.net/10261/15015
DOI10.1016/j.electacta.2004.05.002
ISSN0013-4686
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