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This study details cathode catalyst layer degradation in polymer electrolyte membrane fuel cells (PEMFCs). It provides extensive data to understand how material variations affect PEMFC durability and performance.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • The performance and stability of polymer electrolyte membrane fuel cells (PEMFCs) are critically dependent on the cathode catalyst layer (CCL) composition and morphology.
  • Understanding the degradation mechanisms within the CCL is essential for enhancing PEMFC efficiency and longevity.

Purpose of the Study:

  • To present comprehensive in-situ characterization data on cathode catalyst degradation in PEMFCs.
  • To facilitate a deeper understanding of catalyst degradation by enabling comparisons across various material compositions and operating conditions.

Main Methods:

  • Conducted 36 durability tests totaling over 4000 hours, varying cathode ionomer-to-carbon ratio, platinum-on-carbon ratio, ionomer equivalent weight, and carbon support type.
  • Applied accelerated stress tests with different upper potential limits and relative humidities.
  • Utilized characterization techniques including IV-curves, limiting current measurements, electrochemical impedance spectroscopy, and cyclic voltammetry.

Main Results:

  • Analyzed changes in PEMFC performance, charge/mass transfer, and electrochemically active surface area.
  • Collected extensive data correlating material variations and stress test conditions with degradation pathways.
  • Established a dataset for comparative analysis of catalyst degradation under diverse experimental parameters.

Conclusions:

  • The presented dataset offers valuable insights into the degradation mechanisms of cathode catalysts in PEMFCs.
  • Provides practical information for researchers aiming to optimize PEMFC materials and operational strategies for improved durability.