Calibrating SECCM measurements by means of a nanoelectrode ruler. The intrinsic oxygen reduction activity of PtNi catalyst nanoparticles

Scanning electrochemical cell microscopy (SECCM) is increasingly applied to determine the intrinsic catalytic activity of single electrocatalyst particle. This is especially feasible if the catalyst nanoparticles are large enough that they can be found and counted in post-SECCM scanning electron mic...

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Published in:Nano research 2022-02, Vol.15 (2), p.1564-1569
Main Authors: Tetteh, Emmanuel Batsa, Löffler, Tobias, Tarnev, Tsvetan, Quast, Thomas, Wilde, Patrick, Aiyappa, Harshitha Barike, Schumacher, Simon, Andronescu, Corina, Tilley, Richard D., Chen, Xingxing, Schuhmann, Wolfgang
Format: Article
Language:English
Subjects:
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Catalysts
Catalytic activity
Catalytic converters
Chemistry and Materials Science
Condensed Matter Physics
Electrocatalysts
Electrochemical cells
Electrochemistry
Materials Science
Microscopy
Nanoparticles
Nanotechnology
Research Article
Ruler method
Scanning electron microscopy
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Summary:Scanning electrochemical cell microscopy (SECCM) is increasingly applied to determine the intrinsic catalytic activity of single electrocatalyst particle. This is especially feasible if the catalyst nanoparticles are large enough that they can be found and counted in post-SECCM scanning electron microscopy images. Evidently, this becomes impossible for very small nanoparticles and hence, a catalytic current measured in one landing zone of the SECCM droplet cannot be correlated to the exact number of catalyst particles. We show, that by introducing a ruler method employing a carbon nanoelectrode decorated with a countable number of the same catalyst particles from which the catalytic activity can be determined, the activity determined using SECCM from many spots can be converted in the intrinsic catalytic activity of a certain number of catalyst nanoparticles.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-021-3702-7