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Adsorption of O, O2 and CO on iridium clusters and the investigations of their stability

Muna Tayyem and Bothina Hamad and Beate Paulus – 2017

Density functional theory calculations were performed to study the stability of Irn clusters as well as the adsorption of O, O2 and CO adsorbates on selected structures. The clusters form three dimensional structures for n>4. Larger clusters of n>13 exhibit simple cubic structures up to n around 32, beyond which fcc structures become more favorable. The binding energy is found to increase as a function of cluster size to approach bulk cohesive energy asymptotically. The total magnetic moment is found to decrease as a function of the cluster size approaching the bulk nonmagnetic ground state. The top adsorption site is the most site of O, O2 and CO on small clusters, unlike Ir64 that exhibits hollow, bridge and top sites, respectively. The vibrational frequencies of CO (O2) on Ir2 and Ir4 are found to be less than those of free molecules of 2102.82 (1562.08)cm−1.

Title
Adsorption of O, O2 and CO on iridium clusters and the investigations of their stability
Author
Muna Tayyem and Bothina Hamad and Beate Paulus
Date
2017
Identifier
DOI: 10.1016/j.chemphys.2017.08.008
Source(s)
Citation
Chem. Phys. 2017, 495, 10-15