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Engineering ORR Electrocatalysts from Co8Pt4 Carbonyl Clusters via ZIF‐8 Templating

Authors :
Peter M. Schneider
Kathrin L. Kollmannsberger
Dr. Cristiana Cesari
Dr. Rachit Khare
Dr. Maxime Boniface
Prof. Dr. Beatriz Roldán Cuenya
Prof. Dr. Thomas Lunkenbein
Prof. Dr. Martin Elsner
Prof. Dr. Stefano Zacchini
Prof. Dr. Aliaksandr S. Bandarenka
Dr. Julien Warnan
Prof. Dr. Roland A. Fischer
Source :
ChemElectroChem, Vol 11, Iss 5, Pp n/a-n/a (2024)
Publication Year :
2024
Publisher :
Wiley-VCH, 2024.

Abstract

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® 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 cmECSA−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.

Details

Language :
English
ISSN :
21960216
Volume :
11
Issue :
5
Database :
Directory of Open Access Journals
Journal :
ChemElectroChem
Publication Type :
Academic Journal
Accession number :
edsdoj.0a8984143c3f4e149718274cc9840ae2
Document Type :
article
Full Text :
https://doi.org/10.1002/celc.202300476