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Microporous Layers with Different Decorative Patterns for Polymer Electrolyte Membrane Fuel Cells.

Liang Chen1, Rui Lin1, Xiadong Chen1

  • 1School of Automotive Studies, Tongji University, Shanghai 201804, China.

ACS Applied Materials & Interfaces
|May 7, 2020
PubMed
Summary
This summary is machine-generated.

Decorative patterns on microporous layers (MPLs) enhance polymer electrolyte membrane fuel cell (PEMFC) performance. A flowerlike pattern on a porosity-graded MPL improved water removal and reactant gas diffusion for better fuel cell efficiency.

Keywords:
PEMFCsgas diffusion layersinterfacemass transfermicroporous layers

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Optimizing the interface between the catalyst layer (CL) and gas diffusion layer (GDL) is crucial for polymer electrolyte membrane fuel cells (PEMFCs).
  • Microporous layers (MPLs) play a key role in managing water and gas transport at this interface.

Purpose of the Study:

  • To investigate the effect of different decorative patterns on MPLs for improved PEMFC performance.
  • To explore novel methods for enhancing water removal and gas permeation within MPLs.

Main Methods:

  • MPLs were prepared using carbon paper substrates coated with polytetrafluoroethylene.
  • Ammonium chloride was used to create varied porous structures and decorative patterns (point-, line-, flowerlike) on the MPLs.
  • Membrane electrode assemblies (MEAs) with different MPL patterns were fabricated and tested for electrochemical performance.

Main Results:

  • An MEA with a porosity-graded MPL (MPL-G) featuring a flowerlike pattern demonstrated superior electrochemical performance.
  • The graded porosity effectively accelerated excessive water removal.
  • The flowerlike pattern enhanced reactant gas diffusion at the CL-MPL interface, leading to improved gas redispersion and a larger active reaction area.

Conclusions:

  • Pattern design of MPLs is a viable strategy to enhance mass-transfer efficiency at the CL-GDL interface in PEMFCs.
  • Flowerlike patterns and graded porosity in MPLs significantly improve fuel cell performance by optimizing water and gas management.