Electrochemical Dynamics of a Single Platinum Nanoparticle Collision Event for the Hydrogen Evolution Reaction

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Abstract

Chronoamperometry was used to study the dynamics of Pt nanoparticle (NP) collision with an inert ultramicroelectrode via electrocatalytic amplification (ECA) in the hydrogen evolution reaction. ECA and dynamic light scattering (DLS) results reveal that the NP colloid remains stable only at low proton concentrations (1.0 mm) under a helium (He) atmosphere, ensuring that the collision events occur at genuinely single NP level. Amperometry of single NP collisions under a He atmosphere shows that each discrete current profile of the collision event evolves from spike to staircase at more negative potentials, while a staircase response is observed at all of the applied potentials under hydrogen-containing atmospheres. The particle size distribution estimated from the diffusion-controlled current in He agrees well with electron microscopy and DLS observations. These results shed light on the interfacial dynamics of the single nanoparticle collision electrochemistry.

Original languageEnglish
Pages (from-to)3464-3468
Number of pages5
JournalAngewandte Chemie - International Edition
Volume57
Issue number13
DOIs
Publication statusPublished - 19 Mar 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • collisions
  • electrocatalytic amplification
  • hydrogen evolution reaction
  • interfacial dynamics
  • nanoparticles

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