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Gold Nanoparticles for CO2 Electroreduction: An Optimum Defined by Size and Shape.

Esperanza Sedano Varo1, Rikke Egeberg Tankard1, Joakim Kryger-Baggesen2

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Optimizing gold nanoparticle size for CO2 electroreduction is key. Around 3 nm, these nanoparticles show the highest selectivity for CO production, enhancing catalytic efficiency.

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Area of Science:

  • Nanotechnology
  • Electrochemistry
  • Catalysis

Background:

  • Nanoparticle size critically influences catalytic activity and selectivity.
  • Optimizing nanoparticle catalysts is essential for efficient chemical transformations.
  • Gold nanoparticles are promising electrocatalysts for CO2 reduction.

Purpose of the Study:

  • To investigate the size-dependent selectivity of gold nanoparticles for CO2 electroreduction.
  • To identify the optimal nanoparticle size for maximizing CO production.
  • To understand the structural factors governing CO2 electroreduction selectivity.

Main Methods:

  • Synthesis of size-selected gold nanoparticles (1.5–6.5 nm).
  • Electrochemical evaluation of CO2 reduction performance.
  • High-resolution transmission electron microscopy (HRTEM) for structural analysis.

Main Results:

  • An optimal gold nanoparticle size of approximately 3 nm was identified for CO2 electroreduction.
  • Maximized selectivity toward carbon monoxide (CO) with up to 60% Faradaic efficiency at low potentials.
  • Multiply twinned nanoparticles, featuring pinned 8-fold coordinated sites, were found to be favorable for CO production.

Conclusions:

  • Nanoparticle size and shape are critical parameters for tuning CO2 electroreduction selectivity.
  • Optimizing the abundance of 8-fold coordinated surface sites is a viable strategy for enhancing CO production.
  • This research advances nanocatalyst design for efficient CO2 conversion into valuable products.