TY - JOUR
T1 - In Situ Observation of Metal to Metal Oxide Progression
T2 - A Study of Charge Transfer Phenomenon at Ru-CuO Interfaces
AU - Porkovich, Alexander
AU - Ziadi, Zakaria
AU - Kumar, Pawan
AU - Kioseoglou, Joseph
AU - Jian, Nan
AU - Weng, Lin
AU - Steinhauer, Stephan
AU - Vernieres, Jerome
AU - Grammatikopoulos, Panagiotis
AU - Sowwan, Mukhles
N1 - Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/11/26
Y1 - 2019/11/26
N2 - 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.
AB - 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.
KW - cupric oxide
KW - interface
KW - nanoclusters
KW - ruthenium
KW - surface charge
UR - http://www.scopus.com/inward/record.url?scp=85073061659&partnerID=8YFLogxK
U2 - 10.1021/acsnano.9b06224
DO - 10.1021/acsnano.9b06224
M3 - 文章
C2 - 31577415
AN - SCOPUS:85073061659
SN - 1936-0851
VL - 13
SP - 12425
EP - 12437
JO - ACS Nano
JF - ACS Nano
IS - 11
ER -