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- Guide New and Future Developments in Catalysis: Hybrid Materials, Composites, and Organocatalysts?
- Guide New and Future Developments in Catalysis: Hybrid Materials, Composites, and Organocatalysts.
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Save to Zotero. Keywords HPLC adsorption antibacterial antioxidant biodiesel catalyst chitosan eugenol hydrothermal immobilization kinetics magnetite methylene blue molecular docking nanocomposite photocatalyst silica silver nanoparticles synthesis transesterification zeolite. Abstract We report the different way to explain the nature of water molecule H 2 O adsorption on the platinum Pt surfaces with low Miller index, i. Here, we perform periodic density functional theory DFT calculations to analyze the correlation between water-surface bonding strength and the observed charge transfer occurring in the systems.
Resume : This paper firstly presents the possibility of direct and continuous weaving the piezoelectric PVDF-TrFE nanofiber on metal-wire for energy harvesting by electrospinning. In this experiment, we try to make highly efficient flexible piezoelectric nanofiber with both an improved energy density and stability and a self-electrode contained nanofiber direct applicable for electronic devices. The other conditions such as needle to substrate metal wire distance and needle size were fixed. The metal wire was continuously rotated and moved in axial direction for uniformly depositing PVDF-TrFE nanofiber during electrospinning.
Resume : Recent attention has been increasingly received to prepare anti-corrosive coatings with superhydrophobicity which can significantly suppress the exposure of corrosive species to metal substrates. Increasing of PiBuPOSSMA content can significantly increase the roughness of the resulting coatings, leading to an increase of apparent water contact angles from The characterizations and photocatalytic test results suggest that the surface s-triazine dyes on SSCN present synergistic effect with the intimately contacted MoS2 layer, allowing for strong light-harvesting capability with effective generation of photo-electrons which transport to the MoS2 layer for H2 evolution.
Our studies provide a new way of future development of low-cost noble-metal-free photocatalysts for efficient solar-driven hydrogen production. Resume : Calcium indate CaIn2O4 is an important wideband gap 3. When self-dried at room temperature, the gel was burnt with camphor a fuel in air to yield a hybrid phase.
At to Hz frequency, the ac conductivity picks-up suddenly by nearly three orders of magnitude, e. Upon exciting at a nm wavelength from a xenon lamp, two broad emission bands appear at nm and nm as intense blue and red lights. Resume : Ever-increasing energy crisis and environmental concerns associated with excessive fossil fuel combustion have aroused intensive search for clean and sustainable alternative energy sources.
Highly efficient and cost-effective electrocatalysts for the oxygen evolution reaction OER are of paramount importance for renewable energy conversion and storage. Moreover, such electrocatalyst possessed excellent electrochemical durability and structural stability. The present work provides a general strategy for the rational design and synthesis of multi-functional hierarchical catalyst systems, which is expected to exhibit superior performance in a wide range of catalysis, especially in water electrolysis. Resume : Currently, efficient transform of economical hydrocarbons to corresponding high value-added oxygenates through aerobic oxidations is receiving increasing attention on account of its great importance in fine chemical industry.
It is expected that the present nanocomposite would provide a promising stable and efficient catalyst system for the oxidation of other alkylaromatics. Resume : With the popularization of portable mobile devices and higher requirement of energy storage devices, the development of high-power energy storage device, especially super capacitor aroused people high attentions.
A series of characterizations showed that Co-Ni hydroxide nanosheets were longitudinally grown on the surface of GP substrate, thus forming a hybrid three-dimensional nanostructure. Furthermore, as-assembled Co0. Resume : The performance and degradation of polymer electrolyte fuel cells and electrolysers depends on the nanostructure of its components. The quantitative investigation of the nanostructure of fuel cell electrodes, especially the analysis of the correct dimensions of the ionomer component has proven to be exceptionally difficult.
Electron beam-based techniques provide a low contrast between ionomer and carbon components and lead to significant shrinkage. Atomic force microscopy AFM can work in humid environment and at elevated temperatures, close to operational conditions. In this contribution, the analysis of cross-sections of Nafion- and Aquivion—based fuel cell electrodes will be presented. A thickness distribution of the ionomer films ranging from roughly 4 to 20 nm was retrieved.
After operation, significant thinning of the ionomer films depending on location within the membrane-electrode-assembly and preparation was found. Differences of the swelling behavior of the ionomer films prior and after operation were used as a measure for ionomer degradation. A dependence of macroscopic cell degradation rate on initial electrode ionomer film thickness was observed. For further determination of the properties model layers were examined.
Significant differences in conductivity for films below 10 nm thickness were detected. Resume : Alkaline water electrolysis AWE is one of the easiest methods for high-purity hydrogen production. Membrane has played a key role in AWE, by providing highly conductive passage of hydroxide ions. As a key component of AWE, Porous composite membrane with good hydroxide ion conductivity, mechanical properties, and thermal and chemical stability are desirable, and many efforts have been concentrated on developing new AWE materials.
Porous composite membrane material is generally composed of polymer matrix and inorganic particles. However, the role of hydroxyl group of inorganic materials and the effect of interaction between polymer matrix and inorganic particles on the membrane characteristics has not been studied yet. In this study, we studied the correlation between characteristics of inorganic particles and the performance of the composite membrane.
The concentration of hydroxyl group on the inorganic particle was strongly related to an increase in conductivity, wettability, and mechanical properties. The inorganic particle with high hydroxyl group was developed and showed the enhanced performance such as ionic resistance, BP pressure, wettability and mechanical properties. Resume : For constructing bio-inspired functional films with various superhydrophobic functions including self-cleaning, anti-corrosion, anti-bioadhesion, and oil-water separation, hydrophobic nanomaterials have been widely used as crucial structural components.
In general, hydrophobic nanomaterials, however, cannot form strong chemical bond networks in organic-inorganic hybrid composite films because of the absence of chemically compatible binding components. Here, we present bio-inspired design and synthesis of multifunctional hybrid nanomaterials with tunable functionalities of covalent cross-linking and hydrophobicity for constructing three-dimensionally interconnected superhydrophobic composite films via a facile solution-based fabrication at room temperature.
The multifunctional hybrid nanomaterials allow the systematic control of functionalities of composite films, as well as the stable formation of covalently linked superhydrophobic composite films with excellent flexibility a bending radius of 6.
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The presented strategy can be a versatile and effective route to generating other advanced functional films with covalently interconnected composite networks. Resume : Since ten years we have used of original rigid poly-functional phosphonic acids to design new metallophosphonate hybrid materials. The tetrahedral geometry of the phosphonic acid and the large number of coordination mode of this group, compare to the one of the carboxylic acid, contribute to produce materials with a great number of original topologies and properties.
Our synthetic strategy consists to understand the influence of some pertinent parameters like pH, time, temperature, number and type of reactive functions, shape of the building block on the dimensionality of the final materials 1D, 2D or 3D network. For organic precursors possessing both a phosphonic and carboxylic acid function, we clearly observed a chemoselectivity influenced by the pH media during the synthesis of the hybrid materials.
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Moreover, a series of materials obtained from these building blocks produced materials exhibiting distinct capacity to release silver ions and were assessed for their bactericidal action. We will describe the link between the structure and properties of these materials completed by our last results obtained following this strategy to obtain non-centrosymetric materials. Resume : Exploration of low-cost and efficient catalysts for hydrogen evolution reaction HER is of great importance for sustainable hydrogen economy.
As one of the most promising alternative candidates for replacement of commercial noble metal catalyst, i. However, designing facile and efficient TMD-based electrocatalysts with abundant active sites and great long-term stability for HER still remains challenge. Herein, we report a general and facile method, by combining chemical vapor transport CVT and chemical Lithium-intercalated method, for preparation of water-dispersed, ultrasmall-sized, single-layer TMD nanodots with high-density active edge sites and clean surface, including MoS2, WS2, MoSe2, Mo0. Impressively, the obtained MoSSe nanodots achieve a low overpotential of mV at current density of 10 mA cm-2, a Tafel slope of 40 mV dec-1 and excellent long-term durability.
The experimental and theoretical results suggest that the excellent catalytic activity of MoSSe nanodots is attributed to the high-density active edge sites, high-percentage metallic 1T phase, alloying effect and basal-plane Se-vacancy. Resume : In order to produce a polymer-inorganic composite film in which a high-dielectric inorganic filler is well dispersed, a high dielectric polymer-composite nanofiber was prepared by electrospinning, followed by hot-pressing method.
New and Future Developments in Catalysis | ScienceDirect
Polyimide and BaTiO3 were used as a polymer matrix and an inorganic filler, respectively. The effects of polyamic acid as a polyimide precursor solution concentration and the content of dispersed BaTiO3 nanoparticle on the nanofiber production were investigated by scanning electron microscope.
By forming nanofibers through electrospinning, dielectric composite films with very high dispersibility could be produced. As a result, it was possible to produce a composite film having a remarkably low dielectric loss value while maintaining a high dielectric property. The dielectric permittivity of the as-fabricated nanocomposites significantly improved with the increase of BaTiO3 fraction.
Resume : In the 4th industrial revolution, smart devices, artificial intelligence equipment, and self-driving cars are emerging as new industrial fields. The heat dissipation and electromagnetic wave problems of the highly integrated electric circuits in the advanced electric devices are rising, resulting in deterioration of performance, lifetime and efficiency of the equipment.
Carbon-based materials, which are widely used as dissipating of heat materials, have excellent thermal conductivity, but also have high electrical conductivity, making them unsuitable as heat protecting and insulating materials. In recent years, hexagonal boron nitride h-BN is an emerging material with excellent mechanical and chemical properties. However, h-BN normally has an anisotropic thermal conductivity in horizontal direction and low thermal transfer efficiency due to the high resistance at the particle surface boundary, and expensive material cost, which is not suitable for thermally conductive and electrically non-conductive material in devices.
Herein, we report a thermally conductive and electrically insulating cylindrical pillar using glass fiber.
A thermal conductivity and an electrical insulating were successfully achieved through powder resistance measurement and LFA test. Especially excellent thermal transfer properties in vertical direction of cylindrical pillar can find commercially applications in a range of electric advanced devices. Resume : The synthesis of highly efficient electrocatalysts for water splitting has played an important role in developing eco-friendly energy sources. LDHs serves as a catalyst to lower energy consumption in water splitting. Conventional methods for synthesizing these catalysts need a lot of time and harsh reaction conditions.
Here, we introduce a simple synthetic method of ZnCo LDHs with a shorter reaction time under a mild condition. Add the Co precursor to the as-synthesized ZnO and stirring it while heating. Using transmission electron microscopy TEM and scanning electron microscopy SEM , the synthesized materials were confirmed to have a sheet structure of several tens of nanometers and a few hundreds of nanometers in size.
The onset-potential of the OER reaction is 1. In addition, as the proportion of initially added Co increases, the onset-potential decreases because of the replacement of Co and Zn. The graph of the stability of the catalyst is stable even though the polymer does not enter during the reaction. They can be applied to the photocatalyst and the catalyst of H2O2 production.