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

被引:81
作者
Asensio, JA
Borrós, S
Gómez-Romero, P
机构
[1] CSIC, Inst Ciencia Mat Barcelona, E-08193 Barcelona, Spain
[2] Univ Ramon Llull, Inst Quim Sarria, E-08017 Barcelona, Spain
关键词
proton-conducting membranes; polybenzimidazole; ABPBI; sulfonated polybenzimidazole; polymer electrolyte; PEMFC;
D O I
10.1016/j.electacta.2004.05.002
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Previously cast ABPBI membranes were sulfonated by doping with sulfuric acid followed by heat treatment at 450degreesC for 5 min in air. Sulfortation 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 sulfortation, 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 x 10(-2) S cm(-2) at 185 degreesC for SABPBI(.)4.6H(3)PO(4) (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 150-200degreesC. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:4461 / 4466
页数:6
相关论文
共 40 条
  • [1] AKITA H, 1999, Patent No. 0967674
  • [2] Role of post-sulfonation thermal treatment in conducting and thermal properties of sulfuric acid sulfonated poly(benzimidazole) membranes
    Ariza, MJ
    Jones, DJ
    Rozière, J
    [J]. DESALINATION, 2002, 147 (1-3) : 183 - 189
  • [3] Polymer electrolyte fuel cells based on phosphoric acid-impregnated poly(2,5-benzimidazole) membranes
    Asensio, JA
    Borró, S
    Gómez-Romero, P
    [J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2004, 151 (02) : A304 - A310
  • [4] Enhanced conductivity in polyanion-containing polybenzimidazoles.: Improved materials for proton-exchange membranes and PEM fuel cells
    Asensio, JA
    Borrós, S
    Gómez-Romero, P
    [J]. ELECTROCHEMISTRY COMMUNICATIONS, 2003, 5 (11) : 967 - 972
  • [5] Proton-conducting polymers based on benzimidazoles and sulfonated benzimidazoles
    Asensio, JA
    Borrós, S
    Gómez-Romero, P
    [J]. JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 2002, 40 (21) : 3703 - 3710
  • [6] ASENSIO JA, IN PRESS J MEMBR SCI
  • [7] ASENSIO JA, 2003, THESIS I QUIMIC SARR
  • [8] BJERRUM NJ, 2001, Patent No. 0118894
  • [9] Proton conduction in acid doped polybenzimidazole
    Bouchet, R
    Siebert, E
    [J]. SOLID STATE IONICS, 1999, 118 (3-4) : 287 - 299
  • [10] High pressure electrical conductivity studies of acid doped polybenzimidazole
    Fontanella, JJ
    Wintersgill, MC
    Wainright, JS
    Savinell, RF
    Litt, M
    [J]. ELECTROCHIMICA ACTA, 1998, 43 (10-11) : 1289 - 1294