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Elucidating Pt-Based Nanocomposite Catalysts for the Oxygen Reduction Reaction in Rotating Disk Electrode and Gas Diffusion Electrode Measurements

preprint
revised on 21.05.2021, 10:36 and posted on 24.05.2021, 09:00 by Jia Du, Jonathan Quinson, Alessandro Zana, Matthias Arenz
In the present study we compare different nanoparticle (NP) composites (nanocomposites) as potential electrocatalysts for the oxygen reduction reaction (ORR). The nanocomposites consist of a mixture of Pt and Ir NPs and Pt and Au NPs, respectively, that are immobilized onto a high surface area carbon support. Pt NPs supported on the same carbon support serve as benchmark. The performance testing was performed in a conventional rotating disk electrode (RDE) setup as well as in a recently introduced gas diffusion electrode (GDE) setup providing high mass transport conditions. The ORR activity is determined, and the degradation tested using accelerated degradation tests (ADTs). It is shown that with respect to the benchmark, the Pt – Au nanocomposite concept exhibits improved ORR activity as well as improved stability both in the RDE and the GDE measurements. By comparison, the Pt – Ir nanocomposite exhibits improved stability but lower ORR activity. Combining the GDE approach with small angle X-ray scattering, it is shown that the improved stability of the Pt – Au nanocomposite can be assigned to a reduced Pt particle growth due to the adjacent Au NPs. The results demonstrate that nanocomposites could be an alternative catalyst design strategy complementing the state-of-the-art alloying concepts.

Funding

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

China Scholarship Council (CSC)

European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No. 840523 (CoSolCat)

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