Mussel-Inspired Polydopamine-Treated Reinforced Composite Membranes with Self-Supported CeOx Radical Scavengers for Highly Stable PEM Fuel Cells

Ki Ro Yoon, Kyung Ah Lee, Sunhee Jo, Seung Ho Yook, Kwan Young Lee, Il Doo Kim, Jin Young Kim

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The physical and chemical degradations of a state-of-the-art proton exchange membrane (PEM) composed of a perfluorinated sulfonic acid (PFSA) ionomer and polytetrafluoroethylene (PTFE) reinforcement are induced through the repeated expansion/shrinkage of the ionomer and free radical attacks. Such degradations essentially originate from the loose structure of the materials and the low interactive binding force among the PEM constituents. In this study, the need for simplified design principles of adhesives led to the use of mussel-inspired polydopamine (PD) as an interfacial modifier for the fabrication of highly durable PEM. Indeed, a self-polymerized dopamine layer acts as an interfacial glue, and enables efficient impregnation of a hydrophilic PFSA ionomer into porous hydrophobic PTFE with high packing density, resulting in strong adhesion between the PTFE and the PFSA polymers in the membrane. In addition, the redox property of the PD end groups spontaneously reduces the partial Ce salts in the ionomer solution and anchors them to the PD@PTFE substrate as defective cerium oxide (CeOx) nanoparticles, reducing the dissolution and subsequent migration under cell operations. Finally, a CePD@PTFE membrane shows outstanding durability in fuel cells under an accelerated humidity cycling test with a reduction in the degree of physical and chemical failures.

Original languageEnglish
Article number1806929
JournalAdvanced Functional Materials
Volume29
Issue number3
DOIs
Publication statusPublished - 2019 Jan 17

Keywords

  • cerium oxides
  • polydopamines
  • polymer exchange membrane fuel cells
  • radical scavengers
  • reinforced composite membranes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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