期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 57, 期 13, 页码 3464-3468出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201712454
关键词
collisions; electrocatalytic amplification; hydrogen evolution reaction; interfacial dynamics; nanoparticles
资金
- PBC Fellowship - Planning and Budgeting Committee of the Council for Higher Education in Israel
- Swiss National Science Foundation [160553]
- Science and Technology Program of Guangzhou [201704030065]
- Israeli Ministry of Science and Technology [3-12610]
- Science and Technology Program of Guangdong [2017A050506015]
- National Natural Science Foundation of China [21676106, 21476087]
- Hebrew University of Jerusalem
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 (1.0mm) 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.
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