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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Suppressing Metal Dissolution in Multi-Grained Catalysts Through Intragrain Atomic Ordering for Stable Fuel Cells.

Eungjun Lee1,2, Haneul Jin3, Hyesung Jo4

  • 1Center for Hydrogen and Fuel Cells, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea.

Advanced Materials (Deerfield Beach, Fla.)
|May 6, 2025
PubMed
Summary

Researchers developed novel multi-grained Nickel-Platinum (NiPt) nanocatalysts with a stable Ni3Pt5 phase. These catalysts show exceptional performance and durability for proton exchange membrane fuel cells (PEMFCs), significantly reducing nickel dissolution.

Keywords:
atomic orderinglong‐term durabilityoxygen reduction reaction (ORR)proton exchange membrane fuel cell (PEMFC)transition metal dissolution

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Developing stable, high-performance catalysts is crucial for fuel cell technology.
  • Structural degradation and elemental dissolution limit the long-term operation of current catalysts.

Purpose of the Study:

  • To design and synthesize novel multi-grained NiPt nanocatalysts with enhanced stability and catalytic activity.
  • To investigate the role of the atomically ordered Ni3Pt5 phase in improving catalyst durability and performance.

Main Methods:

  • Ultrasound-assisted synthesis to promote atomic transposition and form the Ni3Pt5 phase within NiPt nanocrystals.
  • Characterization of catalyst structure and composition.
  • Performance testing in proton exchange membrane fuel cells under light-duty and heavy-duty vehicle conditions.

Main Results:

  • Successfully synthesized multi-grained NiPt nanocatalysts featuring an embedded Ni3Pt5 phase.
  • Achieved high mass activity (0.94 A mgPt-1) and current density (421 mA cm-2 @ 0.8 V) under light-duty conditions, retaining 78% activity after testing.
  • Demonstrated superior durability under heavy-duty conditions, surpassing U.S. Department of Energy targets with minimal Pt utilization loss and power decrease.

Conclusions:

  • The atomically ordered Ni3Pt5 phase is critical for stabilizing NiPt nanocrystals, enhancing both catalytic activity and durability.
  • Ni3Pt5 embedded nanocatalysts represent a promising advancement for next-generation proton exchange membrane fuel cells.
  • This work addresses key challenges in long-term fuel cell operation through rational catalyst design.