• 文献标题:   Cross-linked sulfonated poly(ether ether ketone) membranes formed by poly(2,5-benzimidazole)-grafted graphene oxide as a novel cross-linker for direct methanol fuel cell applications
  • 文献类型:   Article
  • 作  者:   HAN J, KIM K, KIM S, LEE H, KIM J, KO T, BAE J, CHOI WJ, SUNG YE, LEE JC
  • 作者关键词:   crosslinking, sulfonated poly ether ether ketone, graphene oxide, inorganic crosslinker, proton exchange membrane, fuel cell
  • 出版物名称:   JOURNAL OF POWER SOURCES
  • ISSN:   0378-7753 EI 1873-2755
  • 通讯作者地址:   Seoul Natl Univ
  • 被引频次:   2
  • DOI:   10.1016/j.jpowsour.2019.227427
  • 出版年:   2020

▎ 摘  要

Cross-linked sulfonated poly (ether ether ketone) (C-SPEEK) membranes for direct methanol fuel cell (DMFC) applications are prepared using SPEEK with chloromethyl side groups (SPEEK-Cl) and poly (2,5-benzimidazole)-grafted graphene oxide (ABPBI-GO) as a cross-linker. The C-SPEEK membranes exhibit remarkably improved physicochemical stability and decreased methanol permeability compared to a pristine SPEEK membrane and SPEEK composite membranes composed of SPEEK and GO based fillers such as GO and ABPBI-GO. Although the proton conductivities of the C-SPEEK membranes are smaller than those of the pristine SPEEK and SPEEK composite (SPEEK/GO and SPEEK/ABPBI-GO) membranes, cell performances of the membrane electrode assemblies (MEAs) using the C-SPEEK membranes with the optimized contents of ABPBI-GO (cross-linker) are better than those using the pristine SPEEK and SPEEK composite membranes due to the well dispersion of ABPBIGO by forming an effectively covalent bonded network structure with SPEEK-Cl resulting in the decreased methanol permeability. The maximum power density of the MEA with the C-SPEEK membrane (86 mW cm(-2)) is larger than those with the pristine SPEEK (71 mW cm(-2)) and SPEEK composite (69 mW cm(-2)) membranes at 60 degrees C with 1.5 M methanol/air feed condition.