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Electrochemical Dynamics of a Single Platinum Nanoparticle Collision Event for the Hydrogen Evolution Reaction
Author(s) -
Xiang Zhipeng,
Deng Haiqiang,
Peljo Pekka,
Fu Zhiyong,
Wang Suli,
Mandler Daniel,
Sun Gongquan,
Liang Zhenxing
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201712454
Subject(s) - ultramicroelectrode , chronoamperometry , dynamic light scattering , chemical physics , hydrogen , nanoparticle , electrochemistry , inert gas , chemistry , platinum nanoparticles , diffusion , scattering , particle (ecology) , materials science , analytical chemistry (journal) , atomic physics , nanotechnology , electrode , cyclic voltammetry , physics , thermodynamics , optics , organic chemistry , oceanography , geology
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 m m ) 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.