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Hierarchical Interfaces Structure Enabling Adaptive Gas-Liquid Transport under Wide Humidity Ranges in PEMFC

Mingyu Lou1,2, Shunbo Lan1,2, Rui Lin1,2

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Summary
This summary is machine-generated.

A novel hierarchical interface structure for microporous layers (MPLs) in proton exchange membrane fuel cells (PEMFCs) significantly improves water management and power density across varied humidity conditions.

Keywords:
LBMPEMFChierarchical interface structureoxygen transport resistanceperforated MPL

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Effective water management is critical for proton exchange membrane fuel cell (PEMFC) performance.
  • Microporous layer (MPL) structural modification is a key strategy for optimizing water balance.

Purpose of the Study:

  • To develop and evaluate a hierarchical interface structure MPL for enhanced water management in PEMFCs.
  • To investigate the impact of this novel MPL structure on fuel cell performance across a wide humidity range.

Main Methods:

  • Fabrication of a hierarchical interface structure MPL with dense surfaces and perforations.
  • Experimental testing of PEMFCs with the novel MPL.
  • Millimeter-scale Lattice Boltzmann Method (LBM) simulations to analyze water management mechanisms.

Main Results:

  • The hierarchical MPL demonstrated superior performance under wide humidity conditions, with a 12% increase in power density at 2 A/cm² compared to normal MPLs.
  • This structure significantly reduced oxygen transport resistance (OTR) and expanded the operational dry region.
  • LBM simulations elucidated the dual role of dense regions (moisture retention) and perforations (gas diffusion/water removal) at different humidity levels.

Conclusions:

  • The hierarchical interface structure MPL offers an effective strategy for achieving superior water management in PEMFCs.
  • This design enhances gas-liquid transport dynamics within the fuel cell components.
  • The findings provide valuable insights for future MPL design and fuel cell optimization.