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Exploring nanoparticle porosity using nano-impacts: platinum nanoparticle aggregates.

Xue Jiao1, Stanislav V Sokolov1, Eden E L Tanner1

  • 1Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK. richard.compton@chem.ox.ac.uk.

Physical Chemistry Chemical Physics : PCCP
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Platinum nanoparticles (PtNPs) porosity was quantified using tag-redox coulometry (TRC). This reveals the true active surface area of PtNPs, crucial for understanding their catalytic behavior.

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Area of Science:

  • Nanomaterials Science
  • Electrochemistry
  • Analytical Chemistry

Background:

  • Platinum nanoparticles (PtNPs) are vital catalysts in various applications.
  • Understanding the porosity and true surface area of PtNPs is essential for optimizing their catalytic performance.
  • Current methods often struggle to accurately determine nanoparticle porosity.

Purpose of the Study:

  • To investigate the porosity of platinum nanoparticles (PtNPs) for the first time.
  • To develop and apply tag-redox coulometry (TRC) for quantifying nanoparticle porosity.
  • To compare experimental results with models of solid and porous nanoparticles.

Main Methods:

  • Utilizing tag-redox coulometry (TRC) to monitor the reduction of 4-nitrobenzenethiol (NTP)-tagged PtNPs.
  • Employing both immobilization and nanoimpact techniques on carbon electrodes.
  • Measuring the average charge per impact to determine the number of adsorbed NTP molecules.

Main Results:

  • Successfully measured the average charge per impact, correlating it to NTP reduction on individual PtNPs.
  • Calculated the number of NTP molecules and the active surface area of PtNPs.
  • Demonstrated that PtNPs exhibit porosity, deviating from a fully solid model.

Conclusions:

  • Tag-redox coulometry (TRC) is a novel and effective method for determining nanoparticle porosity.
  • The study reveals the porous nature of PtNPs, providing a more accurate assessment of their active surface area.
  • This work enhances the understanding of nanoparticle (electro-)catalytic behavior by elucidating their true surface characteristics.