Hydrogen Chemisorption on Singly Vanadium-Doped Aluminum Clusters

作者：Vanbuel Jan; Fernandez Eva M; Ferrari Piero; Gewinner Sandy; Schoellkopf Wieland; Balbas Luis C; Fielicke Andre; Janssens Ewald^*

来源：Chemistry - A European Journal, 2017, 23(62): 15638-15643.

DOI：10.1002/chem.201704361

• density functional calculations
• hydrogen storage
• IR spectroscopy
• mass spectrometry
• metal clusters

The effect of vanadium doping on the hydrogen adsorption capacity of aluminum clusters (Al-n(+), 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 H-2 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.

• 出版日期2017-11-7