Reactivity of graphene-supported Co clusters

Waleska-Wellnhofer N, Arzig S, Düll F, Bauer U, Bachmann P, Steinhauer J, Papp C, Risse T (2024)

Publication Type: Journal article

Publication year: 2024

Journal

Surface Science Elsevier

Book Volume: 749

Article Number: 122573

DOI: 10.1016/j.susc.2024.122573

Abstract

Graphene-supported Co clusters were investigated by high-resolution XPS, TPD and IRRAS using CO as a probe molecule. CO adsorption was observed at edge, on-top and bridge/hollow sites on the as-prepared clusters. Temperature-programmed XPS showed CO dissociation at T > 300 K. The CO desorption temperatures were determined by TPD measurements to be 260, 320 and 400 K for CO^{bridge/hollow}, CO^edge and CO^top, respectively. The CO dissociation products were used to investigate the adsorption of CO on carbon and oxygen precovered Co clusters. Site blocking by these adatoms was found resulting in the absence of CO^edge (XPS and TPD) and a decrease of the CO adsorption capacity (XPS, TPD and IRRAS). Additionally, no CO dissociation was found on the precovered clusters concluding a blocking of the catalytically active sites which are the edge sites of the clusters.

Authors with CRIS profile

Natalie Waleska-Wellnhofer Lehrstuhl für Physikalische Chemie II Fabian Düll Lehrstuhl für Physikalische Chemie II Udo Bauer Lehrstuhl für Physikalische Chemie II Johann Steinhauer Lehrstuhl für Physikalische Chemie II Christian Papp Lehrstuhl für Physikalische Chemie II

Involved external institutions

Freie Universität Berlin

Germany (DE)

How to cite

APA:

Waleska-Wellnhofer, N., Arzig, S., Düll, F., Bauer, U., Bachmann, P., Steinhauer, J.,... Risse, T. (2024). Reactivity of graphene-supported Co clusters. Surface Science, 749. https://doi.org/10.1016/j.susc.2024.122573

MLA:

Waleska-Wellnhofer, Natalie, et al. "Reactivity of graphene-supported Co clusters." Surface Science 749 (2024).

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