Herein, we synthesized uniform pomegranate-like microclusters (MCs) via carbonization of a Prussian blue analogue; the MCs consist of homogeneously inlaid ultrafine Co nanoparticles in nitrogen-doped carbon subunits (Co-NPC). The hierarchical pore structure and high conductivity of the Co-NPC-MCs can immobilize sulfur species, …
Ultrafine RuP 2 particles embedded in nitrogen-doped carbon has been obtained.. Uniform RuP 2 with the size of about 3 nm are well dispersed on the surface of the NC.. The coordination between EDTA and Ru may be the key for this structure. • RuP 2 @NC demonstrates the obviously enhanced electrocatalytic activity for HER.
The ultrafine NbN nanoparticles and nitrogen-doped carbons guarantee efficient polysulfides trapping and fast redox reaction kinetics even with a high sulfur content of 75 wt%. In addition, porous carbon nanosheets and NbN nanoparticles provide more active sites for Li 2 S nucleation and serve as a second host for the reuse of sulfur.
Co 3 O 4 embedded in nitrogen-doped graphene (Co 3 O 4 /N-G-750) is prepared by a two-step synthetic method: polyol microwave heating method and vacuum tube calcination method. The diameter from 2 nm to 4 nm of the Co 3 O 4 particles can be easily controlled on a nitrogen-doped graphene surface by adjusting the experimental …
Herein, ultrafine Co–Mo 2 C nanocrystals confined in nitrogen-doped carbon nanosheets (Co–Mo 2 C/NCS) are meticulously designed and serve as a functional interlayer. Density functional theory (DFT) calculations confirm that the conductivity and adsorption ability of Co–Mo 2 C is enhanced, owing to the modulated electronic structure by the ...
To improve atomic utilization of metal–organic framework for biodiesel production from microalgal lipids with high acid value, ultrafine ZIF-67 was proposed to release metal atoms normally encapsulated in the framework to form coordinatively unsaturated cobalt-nitrogen active sites Co-N x (x < 4) on crystal surfaces. With …
The evenly distributed ultrafine nanocrystals favor the exposure of active sites. PNCDs as the support facilitate charge transfer and protect the nanocrystals from aggregation during the HER process. Moreover, the strong coupling interactions between MC and M 2 C provide beneficial sites for both water dissociation and hydrogen …
The temperature rate was controlled at 5 °C/min. To prepare ultrafine nitrogen-doped CNFs adsorbents, the CNFs were further heat-treated with NH 3 at the desired temperature (850 ~ 1050 °C) for 30 min, the gas ratio of NH 3 /N 2 was controlled at 30 vol% and the total flow was set at 200 mL/min. The resultant products were denoted …
Solar-driven reduction of dinitrogen (N 2) to ammonia (NH 3) is severely hampered by the kinetically complex and energetically challenging multielectron reaction.Oxygen vacancies (OVs) with abundant localized electrons on the surface of bismuth oxybromide-based semiconductors are demonstrated to have the ability to capture and activate N 2, …
3. Double Position-Limiting Technology Makes Operation More Stable. In the CLUM series ultrafine vertical roller mill, the contact point between roller shell and millstone liner plate adopts electronic limiting technology and mechanical limiting protection technology, which can avoid the destructive impact (e.g. the grinding roller directly smashing the millstone) …
Mai and Zhang et al. fabricated ultrafine metal oxide dots (3–6 nm) embedded in nitrogen-enriched 3D carbon nanofiber networks via self-assembling of metal-polysaccharide frameworks and subsequent annealing, which showed superior electrochemical performance for lithium/sodium storage owing to the ultrasmall particle …
Although long-term exposure to traffic-related air pollutants such as nitrogen dioxide has been linked to cardiovascular disease (CVD) mortality, little is known about the association between ultrafine particles (UFPs), defined as particles less than or equal to 0.1 μm in diameter, and incidence of major CVD events.
Nitrogen-doped mesoporous carbon nanosphere (NMCS) with tunable sizes and uniform mesoporosity was synthesized by a facile soft-templating method. During the synthesis, F127 (PEO-PPO-PEO triblock copolymer) could be used not only as a soft template to generate the mesostructure but also as a size-control agent to tailor the size of NMCS in …
The ultrafine Pd nanoparticles (PdNPs) supported on N-doped partially reduced graphene oxide (Pd/PNGO) were in-situ synthesized by nitrogen glow discharge plasma using a one-step method without any protective agents and chemical reducing agents. The N-doping and reduction of graphene oxide occurred simultaneously as the …
Electrocatalytic nitrogen reduction reaction (NRR) at ambient conditions is a promising route for ammonia (NH3) synthesis but still suffers from low activity and selectivity. Here, ultrafine Sn nanoparticles (NPs) grown on carbon blacks (SnSC/C) have been synthesized through a wet-chemical method using sodium citrate dehydrate as a …
Carbon-supported Ru-based catalysts have shown great potential in the hydrodeoxygenation of biomass-derived chemicals but still suffer from the uneven/unstable metal loading owing to the weak affinity between the metal and the carbon-based support. Herein, novel ultrafine Ru nanoparticles supported on lignin-derived nitrogen-doped …
We constructed land use regression models for annual averages of ultrafine particles and ozone. • Models for ultrafine particles and ozone performed very well for Augsburg, Germany. • Models for PM 10, PM 2.5, soot and nitrogen oxides also performed well. • PNC was moderately correlated with PM 2.5 and ozone, but highly correlated with …
1. Introduction. As a green and sustainable energy carrier, hydrogen has shown great potential in practical applications because of its high energy content, renewability and zero-pollution discharge [1], [2].However, the shortcoming in safe and effective storage and release of hydrogen still prohibits the large-scale applications …
Nitrogen-rich covalent organic frameworks (COFs) with a high content of nitrogen and an inherent porous skeleton are considered as a remarkable support for encapsulating active metal nanoparticles (MNPs). ... The M–N coordination reduction strategy for encapsulating ultrafine MNPs into the pores of COFs opens a valuable pathway for …
SCM Ultrafine Grinding Mill is a new superfine powder (325-2500 mesh) production equipment developed through accumulating years of experience. Агуулга руу алгасах …
Photocatalytic O 2 activation to generate reactive oxygen species is crucially important for purifying organic pollutants, yet remains a challenge due to poor adsorption of O 2 and low efficiency of electron transfer. Herein, we demonstrate that ultrafine MoO x clusters anchored on graphitic carbon nitride (g-C 3 N 4) with dual nitrogen/oxygen …
Confinement of ultrafine Co3O4 NPs in nitrogen-doped graphene-supported macroscopic microspheres were fabricated.. Ultrafine Co3O4 allowed a higher density of active sites to be exposed. • Oxygen vacancy and confined structure induced the interfacial mass/electron transfer.. Co3O4@N-rGO achieved ultra-fast SMX degradation.
LUM Ultrafine Vertical Grinding Mill is independently designed by SBM on the basis of years of experience in grinding mill production. Агуулга руу алгасах ... Европын трапецын …
In this study, a new catalyst, a porous 3D superstructure of nitrogen-doped carbon decorated with ultrafine cobalt nanodots (Co@NCSS), was prepared from the self-assembly of polyimide nanoparticles. The addition of cobalt atoms regulated the self-assembly behavior of polyimide and changed the microstructure and chemical …
The distribution of micropores and ultrafine pores facilitates effective connection and ion transport at the electrode–electrolyte interface, leading to an increase in the number of active sites in carbon materials and ultimately improving their specific capacitance. Nitrogen-containing groups also provided additional pseudocapacitance.
Ultrafine PtCu nanoparticles supported on NrGO were developed via wet-reflux strategy. • The as-prepared PtCu/NrGO possesses a uniform dispersion of PtCu nanoparticles with minimal aggregation. • The hybrid architecture of PtCu with NrGO provides extended surface area, active reaction centres and electron transfer sites. •
Ultrafine MoP Nanoparticle Splotched Nitrogen‐Doped Carbon Nanosheets Enabling High‐Performance 3D‐Printed Potassium‐Ion Hybrid Capacitors - Zong - 2021 - …