Oxidation state of oxide supported nanometric gold

Wang, J. G.; Hammer, Bjørk

doi:10.1007/s11244-007-0277-9

Cited by 76 publications

(80 citation statements)

References 75 publications

(142 reference statements)

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“…[4][5][6][7][8][9][10] Accordingly, a number of mechanisms have been proposed to elucidate the enhanced activities of Au NPs, including an odd number of electrons, 11 the quantum size effect, 11,12 metal-nonmetal transitions in a given cluster size regime, 13 and the presence of poorly coordinated edge or corner atoms. [14][15][16] Moreover, it is also widely recognized that the interactions between the Au and the support, including the strain effect, 17 the charge state [18][19][20][21] of the Au atom, and particularly the charge transfer between the Au NPs and the substrates 22 have been regarded to be crucial in determining the performance of the Au NPs.…”

Section: Introductionmentioning

confidence: 99%

An oxidized magnetic Au single atom on doped TiO₂(110) becomes a high performance CO oxidation catalyst due to the charge effect

et al. 2017

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Catalysis using gold nanoparticles supported on oxides has been under extensive investigation for many important application processes. However, how to tune the charge state of a given Au species to perform a specific chemical reaction, e.g. CO oxidation, remains elusive. Here, using first-principles calculations, we show clearly that an intrinsically inert Au anion deposited on oxygen-deficient TiO 2 (110) (Au@TiO 2 (110)) can be tuned and optimized into a highly effective single atom catalyst (SAC), due to the depletion of the d-orbital by substrate doping. Particularly, Ni-and Cu-doped Au@TiO 2 complexes undergo a reconstruction driven by one of the two dissociated O atoms upon CO oxidation. The remaining O atom heals the surface oxygen vacancy and results in a stable bow-shaped surface "O-Au-O" species; thereby the highly oxidized Au single atom now exhibits magnetism and dramatically enhanced activity and stability for O 2 activation and CO oxidation, due to the emergence of high density of states near the Fermi level. Based on further extensive calculations, we establish the "charge selection rule" for O 2 activation and CO oxidation on Au: the positively charged Au SAC is more active than its negatively charged counterpart for O 2 activation, and the more positively charged the Au, the more active it is.

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Section: Introductionmentioning

confidence: 99%

An oxidized magnetic Au single atom on doped TiO₂(110) becomes a high performance CO oxidation catalyst due to the charge effect

et al. 2017

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“…[7][8][9][10] In addition to providing information about the major surface-bound products, the infrared spectra enable us to monitor the oxidation state of the Au particles during the reaction. Previous theoretical 11 and experimental 12,13 studies have shown that the vibrational frequency of surface-bound CO is highly sensitive to the site of adsorption on Au surfaces. The inset in Fig.…”

Section: Hrtem Of 22 Nm Particlesmentioning

confidence: 99%

“…Our studies, which show cycling of the oxidation state of the Au particles during the decomposition of DMMP, have been used in conjunction with previous work to provide a description of the overall mechanism of oxidation. 11,[17][18][19][20][21][22] Details of the mechanism are discussed in detail in the publications listed in this final report. Briefly, we find that the activation of oxygen involves charge transfer from a Au δ+ site residing at the periphery of a Au particle to form an active oxygen species, probably O 2 -.…”

Section: Hrtem Of 22 Nm Particlesmentioning

confidence: 99%

Adsorption and Decomposition of CWA Simulants on Single Crystal and Nanostructured Metal Oxides

Morris¹

2009

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Tech Final Report I. ForewordOur studies are directed at determining the adsorption mechanisms and reaction pathways for the chemical warfare agent simulant (CWA) for GB (Sarin) on metal oxide surfaces and nanoparticles. By learning about how surface structure, nanoparticle size, composition, and surface co-adsorbates affect the overall interfacial chemistry, we are providing insight that can be applied toward the development of effective sorbent materials for protection and decontamination. Our approach couples ultrahigh vacuum (UHV) surface analysis instrumentation with precision simulant dosing capabilities to explore agent reactivity on highly characterized and contaminant-free metal oxide surfaces. Our work during this funding period has focused on studying the uptake and decomposition of the simulant dimethyl methylphosphonate (DMMP) when it impinges on the surface of nanoparticulate systems.

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“…The intrinsic properties of the support, especially its reducibility, can influence the properties of gold nanoparticles such as the size and the electronic state [12,13]. Also these reducible supports generate more oxygen vacancies at the Au-support interface [14,15], which is believed to be the center activating oxygen molecules.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Base Metal (M) Oxidation State in Au-M-O/TiO2 Systems on Their Catalytic Activity in Carbon Monoxide Oxidation

et al. 2011

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Base metal promoted gold/titania catalysts were synthesized, characterized and tested in CO oxidation reaction. Catalysts containing dopant metals in higher oxidation states exhibited higher activity than catalysts containing dopants in reduced states. The activity of fresh catalysts promoted by Cu, Fe and Ni was similar to the unpromoted one, but treatment in reducing and oxidizing atmospheres revealed the supremacy of the copper promoted catalyst. The sequential deposition method proved to be better than the co-deposition-precipitation method. An attempt to explain these differences using XPS, FTIR and H 2 TPR was performed.

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Oxidation state of oxide supported nanometric gold

Cited by 76 publications

References 75 publications

An oxidized magnetic Au single atom on doped TiO₂(110) becomes a high performance CO oxidation catalyst due to the charge effect

An oxidized magnetic Au single atom on doped TiO₂(110) becomes a high performance CO oxidation catalyst due to the charge effect

Adsorption and Decomposition of CWA Simulants on Single Crystal and Nanostructured Metal Oxides

The Influence of Base Metal (M) Oxidation State in Au-M-O/TiO2 Systems on Their Catalytic Activity in Carbon Monoxide Oxidation

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Oxidation state of oxide supported nanometric gold

Cited by 76 publications

References 75 publications

An oxidized magnetic Au single atom on doped TiO2(110) becomes a high performance CO oxidation catalyst due to the charge effect

An oxidized magnetic Au single atom on doped TiO2(110) becomes a high performance CO oxidation catalyst due to the charge effect

Adsorption and Decomposition of CWA Simulants on Single Crystal and Nanostructured Metal Oxides

The Influence of Base Metal (M) Oxidation State in Au-M-O/TiO2 Systems on Their Catalytic Activity in Carbon Monoxide Oxidation

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An oxidized magnetic Au single atom on doped TiO₂(110) becomes a high performance CO oxidation catalyst due to the charge effect

An oxidized magnetic Au single atom on doped TiO₂(110) becomes a high performance CO oxidation catalyst due to the charge effect