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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Unveiling Local Aging Patterns Following Accelerated Stress Testing of High-Performance Polymer Electrolyte Fuel

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This study reveals how fuel cell membrane electrode assemblies age differently under various stress tests. Carbon corrosion causes severe degradation, while platinum particle growth shows less impact on current distribution.

Keywords:
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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Membrane electrode assemblies (MEAs) are critical components in fuel cells.
  • Understanding heterogeneous aging patterns is vital for improving fuel cell durability.

Purpose of the Study:

  • To analyze heterogeneous aging in MEAs under different accelerated stress test (AST) conditions.
  • To investigate the impact of carbon corrosion (CC AST) and platinum (Pt) particle growth (Pt AST-Wet, Pt AST-Dry) on MEA performance.

Main Methods:

  • Utilized multimodal characterization techniques.
  • Examined variations in current distributions and Pt particle size maps.
  • Subjected MEAs to simulated carbon corrosion and Pt particle size growth conditions.

Main Results:

  • Distinct current distribution patterns were observed for each AST case.
  • CC AST led to severe performance degradation with significant current gradients.
  • Pt AST-Wet and Pt AST-Dry showed minor changes in spatial current distribution despite varied Pt particle growth.
  • Preferential Pt particle growth under serpentine flow field bends was observed in Pt AST-Wet.

Conclusions:

  • Mass transport properties significantly influence fuel cell performance and durability.
  • Factors beyond electrochemically-active surface area (ECSA) are crucial for assessing fuel cell durability.
  • Heterogeneous aging mechanisms vary depending on the AST conditions.