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Summary

Platinum dissolution in fuel cells is lower in realistic conditions than previously thought. New in-situ methods show reduced platinum loss in gas diffusion electrode setups, especially with membranes, aiding fuel cell durability.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Platinum (Pt) dissolution is a critical degradation pathway in proton-exchange membrane fuel cells (PEMFCs).
  • Existing studies primarily use aqueous model systems, limiting direct application to real fuel cell environments.
  • Bridging the gap between model systems and operational fuel cells is essential for understanding Pt stability.

Purpose of the Study:

  • To develop and utilize a novel in-situ method for evaluating Pt dissolution under realistic fuel cell conditions.
  • To investigate the transport of dissolved Pt species through ionomer membranes.
  • To correlate Pt dissolution behavior with catalyst layer properties and membrane presence.

Main Methods:

  • Development of a gas diffusion electrode (GDE) half-cell setup.
  • Integration of the GDE half-cell with inductively coupled plasma mass spectrometry (ICP-MS) for precise elemental analysis.
  • In-situ evaluation of Pt dissolution and dissolved Pt transport in realistic catalyst layers and through Nafion membranes.

Main Results:

  • Specific Pt dissolution rate increased significantly as Pt loading decreased.
  • Pt dissolution in the GDE setup was considerably lower compared to traditional aqueous flow cell experiments.
  • Incorporating a membrane onto the catalyst layer further reduced Pt dissolution.

Conclusions:

  • Mass transport limitations of dissolved Pt species play a crucial role in mitigating dissolution and promoting re-deposition.
  • The GDE in-situ method provides a more accurate assessment of Pt stability in operational fuel cells.
  • Optimizing catalyst layer and membrane configurations can enhance the durability of Pt-based fuel cell catalysts.