As a hot topic in recent years, hierarchically porous structured materials have received plenty of attentions and lots of work has been done on their synthesis. For their outstanding properties, hierarchically porous ...
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As a hot topic in recent years, hierarchically porous structured materials have received plenty of attentions and lots of work has been done on their synthesis. For their outstanding properties, hierarchically porous structured materials have attractively potential applications in catalysis, controlled release, biomedicine, separation science and energy. We have synthesized several micro-meso-macro hierarchically porous structured materials through different methods. Except for some general characteristics of porous structured materials, these materials possess some common superiorities, and the highlight is that they have highly interconnected network of well-defined macropores with uniform mesoporosity and zeolitic micro-channels which can lead to highly active sites, larger external surface areas and fast diffusion of species. We applied these hierarchically porous structured materials to catalysis by encapsulating active species into macropores, such as enzymes,metallic oxide nanoparticles and metallic ion, which exhibite high catalytic activity, long-term stability, and excellent recycling behaviour. Hierarchically porous structured materials applied to catalysis are obviously more attractive and promising than tradition catalysts. What's more, other advanced properties can be exploited in the design of magnetic devices, sensors, and biofuel cell etc. which are based on hierarchically porous structured materials.
A direct electroless copper （Cu） coating on tungsten powders method requiring no surface treatment or stabilizing agent and using glyoxylic acid （C2H203） as a reducing agent was reported. The effects of copper sul...
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A direct electroless copper （Cu） coating on tungsten powders method requiring no surface treatment or stabilizing agent and using glyoxylic acid （C2H203） as a reducing agent was reported. The effects of copper sulfate concentration and the pH of the plating solution on the properties of the prepared W@Cu composite powders were assessed. The content of Cu in the composite powders was controlled by adjusting the concentration of copper sulfate in the electroless plating solution. A uniform, dense, and consistent Cu coating was obtained under the established optimum conditions （flow rate of C2H203 = 5.01 mL/min, solution pH = 12.25 and reaction temperature 45.35℃） by using central composite design method. In addition, the crystalline Cu coating was evenly dispersed within the W@Cu composite powders and Cu element in the coating existed as Cu~. The formation mechanism for the W@Cu composite powders by electroless plating in the absence of surface treatment and stabilizing agent was also proposed.
The (Mg0.8Zn0.2)TiO3(MZT) as the foundation is mainly studied to join high dielectric material Ba4Nd28/3Ti18O54·zBi2O3(BNT) to preparation microwave dielectric ceramic 0.7(Mg0.8Zn0.2)TiO3·0.3{Ba4Nd28/3Ti18O5...
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Nest-like and multilayered-disk-like Bi2WO6 photocatalysts were synthesized through a hydrothermal strategy using thiourea and acetic acid as complexing agents. The nest-like Bi2WO6 showed excellent visible-light-driv...
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Nest-like and multilayered-disk-like Bi2WO6 photocatalysts were synthesized through a hydrothermal strategy using thiourea and acetic acid as complexing agents. The nest-like Bi2WO6 showed excellent visible-light-driven photocatalytic performance, and it could decompose rhodamine B（RhB） within 100 minutes. This excellent performance resulted from its special microstructure and the relatively large surface area.
FePt nanoparticles (NPs)/reduced graphene oxide (rG-O) composites have been synthesized using a one-pot strategy without surfactants. Monodisperse FePt NPs were homogenously loaded onto rG-O sheets. By controlling the...
FePt nanoparticles (NPs)/reduced graphene oxide (rG-O) composites have been synthesized using a one-pot strategy without surfactants. Monodisperse FePt NPs were homogenously loaded onto rG-O sheets. By controlling the concentration of dispersed graphene oxide (GO), uniform FePt flower-like nanoclusters can be obtained. FePt/rG-O composites exhibited exceptionally high electrocatalytic performance in the activity and durability for the oxygen reduction reaction (ORR), much superior to that of the commercial Pt/C (60%). The straightforward synthesis of FePt/rG-O composites provides a low-cost and high performance catalyst for the ORR, which is also a promising strategy for the synthesis of various Pt-based bimetallic alloy/rG-O composites for potential uses in catalysis and energy fields.
Monolayer chemically converted graphene （CCG） nanosheets can be homogeneously self-assembled onto silicon wafer modified by 3-aminopr- opyl triethoxysilane （APTES） to form very thin graphene film. The CCG film was...
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Monolayer chemically converted graphene （CCG） nanosheets can be homogeneously self-assembled onto silicon wafer modified by 3-aminopr- opyl triethoxysilane （APTES） to form very thin graphene film. The CCG film was characterized by FT-IR, XRD, SEM, TEM and AFM. Results show that CCG sheets formed monolayer film after assembled onto silicon wafer and there is a very tight chemical bond between sheets and wafer. Furthermore, the electrical measurements revealed that the monolayer graphene film has an excellent electrical conductivity.
In order to utilize the exhaust heat of internal combustion engine effectively and enhanceits fuel economy, a test bench used in Automobile Exhaust Thermoelectric Generator (AETEG) isdesigned in this paper, the main c...
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