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Journal Article

Hydrogen Chemisorption on Singly Vanadium-Doped Aluminum Clusters

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Gewinner,  Sandy
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Schöllkopf,  Wieland
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Fielicke,  André
Molecular Physics, Fritz Haber Institute, Max Planck Society;
Institut für Optik und Atomare Physik, TU Berlin;

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Citation

Vanbuel, J., Fernández, E. M., Ferrari, P., Gewinner, S., Schöllkopf, W., Balbás, L. C., et al. (2017). Hydrogen Chemisorption on Singly Vanadium-Doped Aluminum Clusters. Chemistry – A European Journal, 23(62), 15638-15643. doi:10.1002/chem.201704361.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002E-18E9-D
Abstract
The effect of vanadium doping on the hydrogen adsorption capacity of aluminum clusters (Aln+, n=2–18) is studied experimentally by mass spectrometry and infrared multiple photon dissociation (IRMPD) spectroscopy. We find that vanadium doping enhances the reactivity of the clusters towards hydrogen, albeit in a size-dependent way. IRMPD spectra, which provide a fingerprint of the hydrogen binding geometry, show that H2 dissociates upon adsorption. Density functional theory (DFT) calculations for the smaller AlnV+ (n=2–8,10) clusters are in good agreement with the observed reactivity pattern and underline the importance of activation barriers in the chemisorption process. Orbital analysis shows that the activation barriers are due to an unfavorable overlap between cluster and hydrogen orbitals.