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Core-shell Au-Pd nanoparticles as cathode catalysts for microbial fuel cell applications.

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Bimetallic gold-palladium core-shell nanoparticles show enhanced catalytic activity and stability for microbial fuel cells, offering a promising solution for wastewater treatment and energy generation.

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Area of Science:

  • Nanotechnology
  • Electrochemistry
  • Environmental Science

Background:

  • Bimetallic nanoparticles with core-shell structures exhibit enhanced catalytic properties due to lattice strain.
  • Microbial fuel cells (MFCs) offer a sustainable approach to wastewater treatment and energy generation.

Purpose of the Study:

  • To investigate the efficacy of bimetallic gold-palladium (Au-Pd) core-shell nanoparticles as cathode catalysts in MFCs.
  • To compare the performance of Au-Pd core-shell catalysts with benchmark platinum (Pt) catalysts.

Main Methods:

  • Synthesis of Au-Pd core-shell nanoparticles with an Au core and a Pd shell.
  • Electrocatalytic evaluation of oxygen reduction reaction (ORR) in neutral conditions.
  • Performance testing of MFCs utilizing Au-Pd core-shell catalysts for wastewater treatment.

Main Results:

  • Au-Pd core-shell nanoparticles demonstrated superior activity and stability for ORR compared to hollow Pt nanoparticles.
  • The enhanced performance is attributed to strong electronic interactions and lattice strain between Au and Pd.
  • MFCs with Au-Pd catalysts achieved a maximum power density of 16.0 W m⁻³ and maintained stability for over 150 days.

Conclusions:

  • Bimetallic Au-Pd core-shell nanostructures are highly effective cathode catalysts for MFCs.
  • These nanostructures offer a promising avenue for efficient wastewater treatment and direct electrical energy generation.
  • The study highlights the potential of engineered core-shell nanostructures in sustainable energy technologies.