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Schneider, Peter M. ; Kollmannsberger, Kathrin L. ; Cesari, Cristiana ; Khare, Rachit ; Boniface, Maxime ; Roldán Cuenya, Beatriz ; Lunkenbein, Thomas ; Elsner, Martin ; Zacchini, Stefano ; Bandarenka, Aliaksandr S. ; Warnan, Julien ; Fischer, Roland A.:
Engineering ORR Electrocatalysts from Co₈Pt₄ Carbonyl Clusters via ZIF-8 Templating.
In: ChemElectroChem.
Bd. 11
(2024)
Heft 5
.
- e202300476.
ISSN 2196-0216
DOI: https://doi.org/10.1002/celc.202300476
Abstract
To reduce the costs of proton exchange membrane fuel cells, the amount of Pt necessary to drive efficient oxygen reduction reaction (ORR) should be minimized. Particle nanostructuring, (nano-)alloying, and metal-doping can yield higher activities per Pt mass through tailoring catalysts owning a high number of active sites and precise electronic properties. In this work, the atom-precise [NBnMe3]2[Co8Pt4C2(CO)(24)] (Co8Pt4) cluster is encapsulated and activated in a zeolitic imidazolate framework (ZIF)-8, which unlocks the access to defined, bare Pt-Co nanoclusters, Co8 +/- xPt4 +/- yNC@ZIF-8, for the fabrication of highly active ORR catalysts. Upon controlled C-interfacing and ZIF-8-digestion, Co-doped Pt NPs (Pt27Co1) with a homogenous and narrow size distribution of (1.1 +/- 0.4) nm are produced on Vulcan (R) carbon. Restructuring of the Pt27Co1/C catalyst throughout the ORR measurement was monitored via high-angle annular dark field-scanning transmission electron microscopy and X-ray photoelectron spectroscopy. The measured ORR mass activity of (0.42 +/- 0.07) A mgPt(-1) and the specific activity of (0.67 +/- 0.06) mA cm(ECSA)(-2) compare favourably with the catalyst obtained by direct C-interfacing the pristine Co8Pt4 cluster and with state-of-the-art Pt/C reference catalysts. Our results demonstrate the potential of ZIF-8-mediated Pt-Co NP synthesis toward devising ORR catalysts with high Pt-mass activity.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | WOS:001158847100001 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Eingestellt am: | 12 Jun 2025 09:27 |
| Letzte Änderung: | 12 Jun 2025 09:27 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/93662 |