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Surface charge and charge transfer between nanoclusters and oxide supports are of paramount importance to the catalysis, surface plasmonics, and optical energy harvesting areas. At present, high-energy X-rays and theoretical investigation are always required to determine the chemical state changes in the nanoclusters and the oxide supports, as well as the underlying transfer charge between them. This work presents the idea of using chrono-conductometric measurements to determine the chemical states of the Ru nanoclusters on CuO supports. Both icosahedral and single-crystal hcp Ru nanoclusters were deposited through gas-phase synthesis. To study the charge transfer phenomenon at the interface, a bias was applied to cupric oxide nanowires with metallic nanoclusters decoration. In situ conductometric measurements were performed to observe the evolution of Ru into RuOx under heating conditions. Structural elucidation techniques such as transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Kelvin probe force microscopy (KPFM) were employed to study the corresponding progression of structure, chemical ordering, and surface potential, respectively, while Ru(0) was oxidized to RuOx on the supporting oxide surface. Experimental and theoretical investigation of charge transfer between nanocluster and oxide support highlighted the importance of metallic character and structure of nanoclusters on the interfacial charge transfer. Thus, allowing the investigation of surface charge behavior on oxide supported catalysts, in situ, during catalytic operation via conductometric measurements.
This article was published in the following journal.
Name: ACS nano
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