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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Next-generation polymer-electrolyte-membrane fuel cells using titanium foam as gas diffusion layer.

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Titanium (Ti) foam enhances polymer electrolyte membrane fuel cell (PEMFC) performance by improving current density and durability. This cost-effective alternative to conventional gas diffusion layers (GDLs) offers superior corrosion resistance for reliable PEMFC commercialization.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Polymer electrolyte membrane fuel cells (PEMFCs) offer high efficiency and zero greenhouse gas emissions.
  • Current challenges include high costs and limited lifespan of the membrane electrode assembly (MEA).
  • Conventional gas diffusion layers (GDLs) face limitations in performance and durability.

Purpose of the Study:

  • To investigate titanium (Ti) foam as a novel electrode material for PEMFCs.
  • To evaluate the performance and durability of Ti foam as an anode gas diffusion layer (GDL).
  • To assess the potential of Ti foam in reducing PEMFC costs and improving reliability.

Main Methods:

  • Fabrication and characterization of Ti foam as an anode GDL.
  • Performance testing of PEMFCs using Ti foam under specific oxygen supply conditions.
  • Accelerated corrosion testing to evaluate material stability and durability.

Main Results:

  • Ti foam as an anode GDL achieved a current density of 462 mA cm⁻², 166% higher than the baseline Toray 060 GDL (278 mA cm⁻²).
  • Ti foam demonstrated superior corrosion resistance with negligible changes in thickness and weight during accelerated testing.
  • Conventional GDLs showed significant reductions in weight and thickness under similar corrosive conditions.

Conclusions:

  • Titanium foam is a promising alternative electrode material for PEMFCs, significantly boosting performance.
  • The unique structure of Ti foam enhances catalytic reactions and current density.
  • Ti foam's exceptional durability and corrosion resistance contribute to longer-term reliability and reduced costs by minimizing platinum catalyst loss.