Revealing the multi-bonding state between hydrogen and graphene-supported Ti clusters

Abstract

Hydrogen adsorption on graphene-supported metal clusters has brought much controversy due to the complex nature of the bonding between hydrogen and metal clusters. The bond types of hydrogen and graphene-supported Ti clusters are experimentally and theoretically investigated. Transmission electron microscopy shows that Ti clusters of nanometer-size are formed on graphene. Thermal desorption spectroscopy captures three hydrogen desorption peaks from hydrogenated graphene-supported Ti clusters. First principle calculations also found three types of interaction: Two types of bonds with different partial ionic character and physisorption. The physical origin for this rests on the charge state of the Ti clusters: when Ti clusters are neutral, H2 is dissociated, and H forms bonds with the Ti cluster. On the other hand, H2 is adsorbed in molecular form on positively charged Ti clusters, resulting in physisorption. Thus, this work clarifies the bonding mechanisms of hydrogen on graphene-supported Ti clusters.

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Cited by in corpus (8)

• Li-intercalated Graphene on SiC(0001): an STM study
• Hydrogen spillover and storage on graphene with single-site Ti catalysts
• Study of hydrogen absorption in a novel three-dimensional graphene structure: Towards hydrogen storage applications
• Covalent Organic Functionalization of Graphene Nanosheets and Reduced Graphene Oxide via 1,3-Dipolar Cycloaddition of Azomethine Ylide
• Morphology of Ti on Monolayer Nanocrystalline Graphene and its Unexpectedly Low Hydrogen Adsorption
• Platinum-Decorated Graphene: Experimental Insight into Growth Mechanisms and Hydrogen Adsorption Properties
• A sensitive calorimetric technique to study energy (heat) exchange at the nano-scale
• Interface effects on titanium growth on graphene