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

Mizera, Jan; Spiridis, N.; Socha, Robert P.; Zimowska, Małgorzata; Grabowski, R.; Samson, K.; Korecki, J.

doi:10.3390/catal2010038

Cited by 6 publications

(3 citation statements)

References 37 publications

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“…56 Note that only sample R3 showed a small peak at 288.4 eV, which is attributed to CO. 56 O 1s spectra of Ti-O were recorded for all samples at 530 eV, 59 except for the sample R3, where two humps were observed at 531.6 and 533 eV, which are related to CO and C-OH of GO, respectively. 60,61 This comes in agreement with Raman analysis, since the sample R3 showed the highest intensity of D and G bands.…”

Section: ■ Results and Discussionmentioning

confidence: 92%

In Situ Formation of Graphene Stabilizes Zero-Valent Copper Nanoparticles and Significantly Enhances the Efficiency of Photocatalytic Water Splitting

Hasan

Tolba

Allam

2018

ACS Sustainable Chem. Eng.

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There is a growing need for new techniques to synthesize metallic copper nanoparticles due to their remarkable use in many advanced technologies. Herein, a novel method to synthesize stable and nonagglomerated zero-valent copper nanoparticles (ZVCNPs) via the in situ formation of reduced graphene oxide (rGO) during the electrospinning process in the presence of polyvinylpyrrolidone as a carbon source is presented. X-ray diffraction, Raman spectroscopy, electron paramagnetic resonance, transmission electron microscopy, and X-ray photoelectron spectroscopy techniques were used to investigate the morphology, structure, and composition of the fabricated materials. The synthesized ZVCNPs were coupled with TiO2 nanofibers and rGO to form an efficient photoactive material to photocatalytically produce hydrogen via water splitting, resulting in 344% increase in the hydrogen yield compared to that of TiO2 nanofibers. The density functional theory (DFT) calculations showed that the ZVCNPs enhance the charge transfer and lower the energy needed for photocatalytic water splitting. This study suggests a novel method for metallic copper stabilization and illustrates the effect of metallic copper as a catalyst for the in situ formation of rGO.

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Section: ■ Results and Discussionmentioning

confidence: 92%

In Situ Formation of Graphene Stabilizes Zero-Valent Copper Nanoparticles and Significantly Enhances the Efficiency of Photocatalytic Water Splitting

Hasan

Tolba

Allam

2018

ACS Sustainable Chem. Eng.

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“…The O 1s spectra show a peak at 529.7 eV for both samples. However, for the TiO 2 –CuO nanofibers composite, the O 1s peak broadens and two new humps were observed at 531 eV and 528.5 eV, which can be ascribed to Ti 3+ , 25 and oxygen in a defected structure, 26 respectively. Fig.…”

Section: Resultsmentioning

confidence: 98%

Unbiased spontaneous solar hydrogen production using stable TiO₂–CuO composite nanofiber photocatalysts

Hasan

Allam

2018

RSC Adv.

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“…The use of water seems to produce gold active sites well stabilized by the ionic liquid dispersed on the support. In the second paper, by Grabowski and coworkers [8], the influence of dopant metals, Cu, Fe and Ni, on the catalytic properties of promoted gold/titania catalysts was addressed.…”

Section: The Present Issuementioning

confidence: 99%

New Frontiers in Gold Catalyzed Reactions

Liotta

2012

Catalysts

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BackgroundFor many years, gold has been regarded as a poor catalyst due to its chemical inertness towards reactive molecules such as oxygen and hydrogen. The interest in using gold in catalysis has increased during the last 20 years, since Haruta reported the surprisingly high activity in CO oxidation at low temperature for small (3-5 nm) gold particles supported on various oxides.Since then, gold nanostructured catalysts have attracted, rapidly growing attention, due to their potential applicability in various reactions of industrial and environment interest. The catalytic applications of gold have been, indeed, explored in several processes, such as NO removal, catalytic combustion of Volatile Organic Compound (VOC), hydrotreatment and chemical processing, and purification of hydrogen for fuel cell applications. Moreover, gold catalysts are, nowadays, employed as air-cleaning devices, for respiratory protection (gas masks), as sensors to detect individual poisonous or flammable gases, as well as deodorizers. Gold catalysts with low-temperature activity towards CO and hydrocarbons oxidation are suitable also for vehicles exhaust gas treatment, especially during the cold start period. Accordingly, at the end of 2007 the company Nanostellar announced the development of a diesel exhaust catalyst using a first catalytic component based on gold alloyed with palladium as the active component for CO oxidation. Nevertheless, despite the extensive recent efforts addressing the extraordinary catalytic behavior of gold nanoparticles, the attainment of the best performing supported gold catalyst is still a challenge and the origin of the structure sensitivity of Au catalytic activity is yet to be completely unravelled. The main reason for this is ascribed to the multiplicity of factors influencing the catalytic activity, including the size of the Au clusters, the oxidation state of gold, the nature of the support material, the Au-support interface, and the preparation method. The catalytic performances of gold nanoparticles have been correlated, in turn, with electronic (quantum size effect, oxidation state), structural and support (defects, perimeter interface) effects, but a OPEN ACCESS

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

Cited by 6 publications

References 37 publications

In Situ Formation of Graphene Stabilizes Zero-Valent Copper Nanoparticles and Significantly Enhances the Efficiency of Photocatalytic Water Splitting

In Situ Formation of Graphene Stabilizes Zero-Valent Copper Nanoparticles and Significantly Enhances the Efficiency of Photocatalytic Water Splitting

Unbiased spontaneous solar hydrogen production using stable TiO₂–CuO composite nanofiber photocatalysts

New Frontiers in Gold Catalyzed Reactions

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

Cited by 6 publications

References 37 publications

In Situ Formation of Graphene Stabilizes Zero-Valent Copper Nanoparticles and Significantly Enhances the Efficiency of Photocatalytic Water Splitting

In Situ Formation of Graphene Stabilizes Zero-Valent Copper Nanoparticles and Significantly Enhances the Efficiency of Photocatalytic Water Splitting

Unbiased spontaneous solar hydrogen production using stable TiO2–CuO composite nanofiber photocatalysts

New Frontiers in Gold Catalyzed Reactions

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Product

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Unbiased spontaneous solar hydrogen production using stable TiO₂–CuO composite nanofiber photocatalysts