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Modulating Electrocatalysis on Graphene Heterostructures: Physically Impermeable Yet Electronically Transparent

Jingshu Hui1,2, Srimanta Pakhira3,4,5,6, Richa Bhargava1

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Graphene heterostructures with metal underlayers and molecular catalysts tune oxygen reduction reaction (ORR) activity. Metal underlayers significantly lower the ORR activation potential, enhancing electrocatalysis.

Keywords:
2D materialsatomistic simulationsdensity functional theoryelectronic couplinggrapheneoxygen reduction reactionscanning electrochemical microscopy

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Graphene's unique electronic properties and thinness are ideal for studying electrochemical reactions.
  • Understanding electrocatalysis is crucial for energy conversion technologies.

Purpose of the Study:

  • To systematically tune the electrocatalytic activity of graphene-based heterostructures for the oxygen reduction reaction (ORR).
  • To investigate the role of metal underlayers and molecular adlayers in modifying ORR mechanisms and performance.

Main Methods:

  • Fabrication of graphene heterostructures with varying metal underlayers (Pt, Au, SiOx) and porphyrin molecular catalysts.
  • Voltammetric testing and electrochemical imaging of patterned electrodes.
  • Computational investigations to elucidate reaction mechanisms.

Main Results:

  • Surface configuration dictates the ORR mechanism, with porphyrin adlayers favoring the 2e- pathway.
  • Metal underlayers significantly reduce the ORR activation potential (Pt > Au > SiOx), indicating involvement of the solution-excluded metal.
  • Graphene acts as a protective layer for noble metals, enabling electrochemical interactions while preventing poisoning.

Conclusions:

  • Graphene-metal-molecule heterostructures offer tunable electrocatalytic activity for ORR.
  • Metal underlayers enhance ORR by facilitating electron permeation through graphene.
  • These findings advance the understanding of 2D materials and heterostructures in electrocatalysis.