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Journal ArticleDOI: 10.1021/ACSCATAL.0C04943

Exploring the Size Effect of Pt Nanoparticles on the Photocatalytic Nonoxidative Coupling of Methane

02 Mar 2021-ACS Catalysis (American Chemical Society)-Vol. 11, Iss: 6, pp 3352-3360
Abstract: The high inertness of the C–H bond makes the photocatalytic methane conversion a significant challenge. The platinum nanoparticle is a promising cocatalyst for CH4 activation, while the study of it...

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Topics: Platinum nanoparticles (56%), Photocatalysis (50%)

6 results found

Open accessJournal ArticleDOI: 10.3389/FCTLS.2021.708319
28 May 2021-
Topics: Photocatalysis (51%)

2 Citations

Journal ArticleDOI: 10.1002/ANIE.202108069
Qi Li1, Yuxing Ouyang1, Hongliang Li2, Liangbing Wang1  +1 moreInstitutions (2)
31 Aug 2021-Angewandte Chemie
Abstract: Abundant and affordable methane is not only high-quality fossil energy, but also the raw material for the synthesis of value-added chemicals. Solar-energy-driven conversion of methane offers a promising approach to directly transform methane to valuable energy sources under mild conditions, but remains as a grand challenge currently. In this Review, recent advancements of photocatalytic conversion of methane are systematically summarized. Insights into the construction of effective semiconductor-based photocatalysts from the perspective of light-absorption units and active centers are proposed and discussed in detail. Moreover, photocatalytic performances of methane conversion over various catalysts are also presented and classified by oxidant systems. Lastly, challenges and future perspectives concerning mechanistic study and practical application of photocatalytic methane oxidation are introduced.

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Topics: Anaerobic oxidation of methane (54%), Energy source (53%), Methane (53%) ... read more

1 Citations

Open accessJournal ArticleDOI: 10.3390/CATAL11111266
21 Oct 2021-Catalysts
Abstract: Over the past few decades, the use of transition metal nanoparticles (NPs) in catalysis has attracted much attention and their use in C–C bond forming reactions constitutes one of their most important applications. A huge variety of metal NPs, which have showed high catalytic activity for C–C bond forming reactions, have been developed up to now. Many kinds of stabilizers, such as inorganic materials, magnetically recoverable materials, porous materials, organic–inorganic composites, carbon materials, polymers, and surfactants have been utilized to develop metal NPs catalysts. This review classified and outlined the categories of metal NPs by the type of support.

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Open accessJournal ArticleDOI: 10.1016/J.COMPOSITESB.2021.109465
Xin Wang1, Xinyu Sun1, Tong Bu1, Qinzhi Wang1  +3 moreInstitutions (1)
Abstract: In recent years, nanozyme-photothermal therapy (NPT) has attracted enormous interests owing to their enhanced therapeutic effects and less adverse effects in the treatment of infectious diseases. However, the development of nanozyme-photothermal agents (NPAs) that can rapidly, efficiently and synergistically combating pathogenic bacteria remains a huge challenge due to the limitation of size effect. Herein, by decorating platinum nanozymes on Zn-based photosensitizer, we report a novel metal-organic framework (MOF)-derived hybrid nanozymes antibacterial strategy for enhanced NPT. This strategy can not only prevent the aggregation of platinum nanozymes and effectively reduce the mass transfer resistance during the kinetic reaction, but also inhibit the photoelectron-hole recombination in the process of photothermal therapy (PTT) and improve the photothermal conversion performance. In the presence of a low concentration of hydrogen peroxide (H2O2), the superior nanocatalytic activity of the MOF-derived hybrid nanozymes can effectively catalyze the release of H2O2 to generate toxic hydroxyl radical (•OH), resulting in the increase of bacterial membrane permeability and thermal sensitivity. Once the near-infrared laser is introduced, the nanozyme-photothermal antibacterial platform can play the role of “nanoknife” to further induce the death of the damaged bacteria by physical cutting. In vitro and vivo in antibacterial assays confirm that the MOF-derived hybrid nanozymes have excellent antibacterial properties, which can serve as an antibacterial candidate with negligible adverse effect. Therefore, this work will open a new avenue for MOF-derived hybrid nanozymes in biomedical application.

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Open accessJournal ArticleDOI: 10.1016/J.APCATB.2021.120919
Zeng Yi1, Zhiyuan Tang2, Xingyang Wu1, Anhua Huang1  +4 moreInstitutions (4)
Abstract: Atomic-scale metals as active center have been widely investigated for efficient photocatalysis. Understanding the specific electronic structure of atomic-scale center is of frofound fundamental importance for superior catalytic performance. Here, we report an atomically dispersed gold on tungsten trioxide (Au1/WO3) catalyst for photocatalytic oxidation of methane toward value-added methanol. The Au1 species reveal a specific tip-enhanced local electrons field which favors the C-H dehydrogenation of methane and thus form methanol (up to 589 µmol g-1 h-1). Both experimental and theoretical results demonstrate such tip-enhanced effect-dependent activity of methane oxidation. The theoretical calculations further reveal a lower adsorption energy of product methanol on Au1, in contrast to Au particles, which suppresses the overoxidation of methanol, and thus promotes its selectivity. Establishing the electric structure-activity may create a platform for designing efficient atomic-scale catalysts for C1 catalysis and green chemistry.

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Topics: Tungsten trioxide (57%), Anaerobic oxidation of methane (55%), Catalysis (54%) ... read more


53 results found

Journal ArticleDOI: 10.1103/PHYSREVLETT.77.3865
Abstract: Generalized gradient approximations (GGA’s) for the exchange-correlation energy improve upon the local spin density (LSD) description of atoms, molecules, and solids. We present a simple derivation of a simple GGA, in which all parameters (other than those in LSD) are fundamental constants. Only general features of the detailed construction underlying the Perdew-Wang 1991 (PW91) GGA are invoked. Improvements over PW91 include an accurate description of the linear response of the uniform electron gas, correct behavior under uniform scaling, and a smoother potential. [S0031-9007(96)01479-2] PACS numbers: 71.15.Mb, 71.45.Gm Kohn-Sham density functional theory [1,2] is widely used for self-consistent-field electronic structure calculations of the ground-state properties of atoms, molecules, and solids. In this theory, only the exchange-correlation energy EXC › EX 1 EC as a functional of the electron spin densities n"srd and n#srd must be approximated. The most popular functionals have a form appropriate for slowly varying densities: the local spin density (LSD) approximation Z d 3 rn e unif

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117,932 Citations

Open accessJournal ArticleDOI: 10.1524/ZKRI.220.5.567.65075
Abstract: CASTEP Computer program / Density functional theory / Pseudopotentials / ab initio study / Plane-wave method / Computational crystallography Abstract. The CASTEP code for first principles electro- nic structure calculations will be described. A brief, non- technical overview will be given and some of the features and capabilities highlighted. Some features which are un- ique to CASTEP will be described and near-future devel- opment plans outlined.

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Topics: CASTEP (62%)

7,988 Citations

Open accessJournal ArticleDOI: 10.1038/S41467-018-07882-8
Maksim Kunitski1, Nicolas Eicke2, Pia Huber1, Jonas Köhler1  +12 moreInstitutions (2)
Abstract: Wave-particle duality is an inherent peculiarity of the quantum world. The double-slit experiment has been frequently used for understanding different aspects of this fundamental concept. The occurrence of interference rests on the lack of which-way information and on the absence of decoherence mechanisms, which could scramble the wave fronts. Here, we report on the observation of two-center interference in the molecular-frame photoelectron momentum distribution upon ionization of the neon dimer by a strong laser field. Postselection of ions, which are measured in coincidence with electrons, allows choosing the symmetry of the residual ion, leading to observation of both, gerade and ungerade, types of interference.

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Topics: Ionization (55%), Neon (54%)

4,138 Citations

Open accessJournal ArticleDOI: 10.1038/S41467-017-02088-W
Abstract: Many studies have shown how pigments and internal nanostructures generate color in nature. External surface structures can also influence appearance, such as by causing multiple scattering of light (structural absorption) to produce a velvety, super black appearance. Here we show that feathers from five species of birds of paradise (Aves: Paradisaeidae) structurally absorb incident light to produce extremely low-reflectance, super black plumages. Directional reflectance of these feathers (0.05-0.31%) approaches that of man-made ultra-absorbent materials. SEM, nano-CT, and ray-tracing simulations show that super black feathers have titled arrays of highly modified barbules, which cause more multiple scattering, resulting in more structural absorption, than normal black feathers. Super black feathers have an extreme directional reflectance bias and appear darkest when viewed from the distal direction. We hypothesize that structurally absorbing, super black plumage evolved through sensory bias to enhance the perceived brilliance of adjacent color patches during courtship display.

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Topics: Super black (58%), Plumage (51%)

3,488 Citations

Journal ArticleDOI: 10.1016/0039-6028(69)90148-4
R. Van Hardeveld1, F. Hartog1Institutions (1)
01 Jun 1969-Surface Science
Abstract: The atoms at the surface of a metal crystal can be differentiated according to the number (j) and arrangement of their nearest neighbours. We have determined how, in (different) crystals with f.c.c., b.c.c. and h.c.p. structures, the total number of surface atoms (Ns) and the proportions of the various types of surface atoms N(C j ) N s depend on the crystallite size. In some cases we have also determined how the number of Bni,j,k,… sites varies with the crystallite size, a Bni,j,k,… site being defined as an ensemble of n surface metal atoms in a certain specified arrangement where the n surface metal atoms have i,j,k etc. nearest neighbours. On the basis of the results we have considered the influence of crystallite size on the sorptive and catalytic behaviour of metal catalysts.

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1,016 Citations