In Situ Observation of Metal to Metal Oxide Progression: A Study of Charge Transfer Phenomenon at Ru–CuO Interfaces
| Autor: | Joseph Kioseoglou, Mukhles Sowwan, Jerome Vernieres, Alexander James Porkovich, Nan Jian, Panagiotis Grammatikopoulos, Stephan Steinhauer, Zakaria Ziadi, Pawan Kumar, Lin Weng |
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| Rok vydání: | 2019 |
| Předmět: |
Kelvin probe force microscope
Materials science General Engineering Oxide Nanowire General Physics and Astronomy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Nanoclusters chemistry.chemical_compound Chemical state chemistry X-ray photoelectron spectroscopy Transmission electron microscopy Chemical physics General Materials Science Surface charge 0210 nano-technology |
| Zdroj: | ACS Nano. 13:12425-12437 |
| ISSN: | 1936-086X 1936-0851 |
| Popis: | Surface charge and charge transfer between nanoclusters and oxide supports are of paramount importance to 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 hexagonal close-packed 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 nanocluster 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, X-ray photoelectron spectroscopy, and Kelvin probe force microscopy were employed to study the corresponding progression of structure, chemical ordering, and surface potential, respectively, as Ru(0) was oxidized to RuOx on the supporting oxide surface. Experimental and theoretical investigation of charge transfer between the nanocluster and oxide support highlighted the importance of metallic character and structure of the 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. |
| Databáze: | OpenAIRE |
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