TY - JOUR
T1 - Preparation and properties of epoxy-cross-linked porous polybenzimidazole for high temperature proton exchange membrane fuel cells
AU - Wang, Shuang
AU - Zhao, Chengji
AU - Ma, Wenjia
AU - Zhang, Gang
AU - Liu, Zhongguo
AU - Ni, Jing
AU - Li, Mingyu
AU - Zhang, Na
AU - Na, Hui
N1 - Funding Information:
This work was supported by the National Nature Science Foundation of China (Grant nos. 21074044 and 21104022 ).
PY - 2012/9/1
Y1 - 2012/9/1
N2 - A new approach has been proposed to obtain high-temperature proton exchange membranes based on novel cross-linked porous polybenzimidazole (PBI). The cross-linked porous PBI membranes (CpPBI) were prepared by leaching out a low-molecular-weight compound dibutyl phthalate and mixing 4,4'-diglycidyl (3,3',5,5'-tetramethylbiphenyl) epoxy resin as a cross-linker. The porous PBI membranes (pPBI) were also prepared for comparison. Compared with pPBI membranes, the mechanical properties and the chemical stability of CpPBI membranes were significantly improved. Both the uncross-linked and cross-linked membranes were doped with phosphoric acid, which may be used as proton exchange membranes for high temperature fuel cell. The doping level of all the pPBI membranes was higher than that of pristine PBI, thus leading to a higher proton conductivity. Especially the CpPBI-10 (with a cross-linker content of 10wt.% and a porogen content of 50wt.%) had a relative high proton conductivity of 0.046Scm -1 at 200°C, which is higher than some of the known porous PBI membranes measured under similar conditions. All the remarkable results of the epoxy-cross-linked porous PBI membranes indicated that the CpPBI membranes could be a suitable candidate for high temperature proton exchange membrane fuel cell (HT-PEMFC) applications.
AB - A new approach has been proposed to obtain high-temperature proton exchange membranes based on novel cross-linked porous polybenzimidazole (PBI). The cross-linked porous PBI membranes (CpPBI) were prepared by leaching out a low-molecular-weight compound dibutyl phthalate and mixing 4,4'-diglycidyl (3,3',5,5'-tetramethylbiphenyl) epoxy resin as a cross-linker. The porous PBI membranes (pPBI) were also prepared for comparison. Compared with pPBI membranes, the mechanical properties and the chemical stability of CpPBI membranes were significantly improved. Both the uncross-linked and cross-linked membranes were doped with phosphoric acid, which may be used as proton exchange membranes for high temperature fuel cell. The doping level of all the pPBI membranes was higher than that of pristine PBI, thus leading to a higher proton conductivity. Especially the CpPBI-10 (with a cross-linker content of 10wt.% and a porogen content of 50wt.%) had a relative high proton conductivity of 0.046Scm -1 at 200°C, which is higher than some of the known porous PBI membranes measured under similar conditions. All the remarkable results of the epoxy-cross-linked porous PBI membranes indicated that the CpPBI membranes could be a suitable candidate for high temperature proton exchange membrane fuel cell (HT-PEMFC) applications.
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U2 - 10.1016/j.memsci.2012.04.011
DO - 10.1016/j.memsci.2012.04.011
M3 - Article
AN - SCOPUS:84861526542
SN - 0376-7388
VL - 411-412
SP - 54
EP - 63
JO - Journal of Membrane Science
JF - Journal of Membrane Science
ER -