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The Oxygen Reduction Reaction on Pt: Why Particle Size and Inter-particle Distance Matter

preprint
submitted on 16.04.2021, 06:59 and posted on 16.04.2021, 12:57 by Masanori Inaba, Alessandro Zana, Jonathan Quinson, Francesco Bizzotto, Carsten Dosche, Alexandra Dworzak, Mehtap Oezaslan, Søren Bredmose Simonsen, Luise Theil Kuhn, Matthias Arenz

Carbon supported Pt based nanoparticles are important electrocatalysts for energy conversion reactions such as the oxygen reduction reaction (ORR). Although this reaction has been extensively studied, the influence of factors such as the particle size and inter-particle distance of the nanoparticle-based or nano-sized electrocatalysts on the ORR activity and durability are not yet fully understood and often intertwined. This lack of understanding is mostly based on the limitation in the synthetic approaches of the electrocatalysts which usually do not allow an independent variation of particle size and inter-particle distance. In the presented work, we succeeded to disentangle both factors using a “colloidal toolbox” approach and have demonstrated an effect of the inter-particle distance on the electronic properties of the nanoparticle via operando electrochemical X-ray absorption spectroscopy (XAS).

Funding

Swiss National Science Foundation (SNSF) via the project No. 200021_184742

History

Email Address of Submitting Author

matthias.arenz@dcb.unibe.ch

Institution

University of Bern

Country

Switzerland

ORCID For Submitting Author

0000-0001-9765-4315

Declaration of Conflict of Interest

no conflict of interest

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