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

Jusung Han, Kihyun Kim, Sungjun Kim, Hyunhee Lee, Junghwan Kim, Taeyun Ko, Jungmoon Bae, Won Jae Choi, Yung Eun Sung, Jong Chan Lee

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

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 ABPBI-GO 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 °C with 1.5 M methanol/air feed condition.

Original languageEnglish
Article number227427
JournalJournal of Power Sources
Volume448
DOIs
StatePublished - 1 Feb 2020
Externally publishedYes

Keywords

  • Cross-linking
  • Fuel cell
  • Graphene oxide
  • Inorganic cross-linker
  • Proton exchange membrane
  • Sulfonated poly(ether ether ketone)

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