Reverse Spillover Dominating CO Adsorption on Single Cobalt Atoms in Graphene Divacancies
Francesco Armillotta, Pardis Naderasli, Valeria Chesnyak, Harald Brune
TL;DR
This study shows that carbon monoxide (CO) adsorbs onto single cobalt atoms in graphene mainly through a reverse spillover mechanism, significantly increasing the sticking probability.
Contribution
The paper introduces a new understanding of CO adsorption on single cobalt atoms in graphene via reverse spillover, not direct impingement.
Findings
CO adsorption on single Co atoms in graphene occurs mainly (up to 97%) through reverse spillover.
Reverse spillover increases the sticking probability by up to two orders of magnitude compared to direct impingement.
The study determines key energy barriers for CO diffusion and adsorption on graphene and cobalt.
Abstract
The kinetics of molecular adsorption and desorption can unveil the details of the adsorption potential that impact, for instance, the overall sticking probability. This information is of particular importance for catalysis and gas sensing. We investigate the room-temperature CO adsorption on a model single-atom catalyst consisting of single Co atoms trapped in graphene (Gr) double carbon vacancies during Gr growth by chemical vapor deposition (CVD) on Ni(111). The study is conducted by combining a thermal desorption spectroscopy (TDS) instrument that allows the study of systems with a very low surface density of active sites, of the order of 10–3 monolayers (MLs) with variable-temperature scanning tunneling microscopy (VT-STM). Our findings show that CO adsorption onto the single Co atoms occurs mainly (up to 97%) through a reverse spillover mechanism, rather than through direct…
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Taxonomy
TopicsGraphene research and applications · Catalytic Processes in Materials Science · Covalent Organic Framework Applications