Abstract Graphene‐based metal oxides generally show outstanding electrochemical performance due to the superior properties of graphene. However, aggregation active oxide nanoparticles on graphene surface may result in a capacity fading and poor cycle performance. Here, mesostructured graphene‐based SnO 2 composite is prepared through situ growth particles using cetyltrimethylammonium bromide as structure‐directing agent. This novel mesoporous inherits advantages nanosheets materials exhibits...

This work reports a green and facile approach to the synthesis of graphene nanosheets through zinc reduction oxide precursor in alkaline media. Compared chemical GO by using hydrazine or its derivations, present route is operationally easy environmentally friendly. Moreover, degree condition much higher than that either Zn solutions alone, indicating cooperative mechanism, as-prepared exhibits good stability solution. simple method shows promising applications bulk-quantity production...

As advanced electrodes for direct alcohol fuel cells, graphene-Pd and graphene-Pt composites with a trace of SnO(2) have been successfully synthesized by modified electroless plating technique. The surface graphene oxide is first sensitized Sn(2+) ions, subsequently, Pd or Pt nanoparticles are deposited on the oxide. Finally, was reduced to further adding NaBH(4). Compared other carbon-(e.g., Vulcan XC-72R) supported Pt, resultant exhibit better electrocatalytic activity long-term stability...

Advanced anode materials for high power and energy lithium-ion batteries have attracted great interest due to the increasing demand conversion storage devices. Metal oxides (e.g., Fe3O4) usually possess theoretical capacities, but poor electrochemical performances owing their severe volume change electronic conductivity during cycles. In this work, we develop a self-assembly approach synthesis of sandwich-structured graphene-Fe3O4@carbon composite, in which Fe3O4 nanoparticles with carbon...

Solving the polysulfide shuttle problem is one of core challenges for industrialization lithium–sulfur batteries. In this work, a triphasic composite LDH/sulfur/rGO (LDH: layered double hydroxide, rGO: reduced graphene oxide) with crepe cake like structure designed and fabricated as positive electrode material Sulfur nanoparticles are embedded in interlayer space thus well protected physically via three-dimensional wrapping chemically strong interaction LDH nanoflakes lithium polysulfides,...

Abstract Ordered mesoporous rutile and anatase TiO 2 samples are prepared using silica SBA‐15 as template freshly synthesized titanium nitrate chloride solutions precursors. The material formed from the solution is monocrystalline contains minimal amounts of Si with a Si:Ti ratio 0.031(4), whereas comprises nanocrystals higher content 0.18(3). It found that control temperature selection Ti‐containing precursor play important roles in determining crystal phase crystallinity. A possible...

Exceptionally long C60 nanowires, with a length to width aspect ratio as large 3000, are grown from 1,2,4-trimethylbenzene solution of C60. They have been formed possess highly unusual morphology, each nanowire being composed two nanobelts joined along the growth direction give V-shaped cross section. The crystal structure these nanowires is found be orthorhombic, unit cell dimensions = 10.2 A, b 20.5 and c 25.6 A. Structural compositional analyses enable us explain observed geometry an...

Since the discovery of many types mesoporous silicas, such as SBA-15, KIT-6, FDU-12 and SBA-16, porous crystalline transition metal oxides, Cr2O3, Co3O4, In2O3, NiO, CeO2, WO3, Fe2O3 MnO2, have been synthesized using silicas hard templates. Several synthetic methods developed. These new materials high potential applications in catalysis, Li-ion rechargeable batteries gas sensors. This article gives a brief review research crystals oxides last four years.

Mesoporous monocrystalline rutile TiO2 has been fabricated at low temperature using mesoporous silicas SBA-15 and KIT-6 as hard templates. The key step of the synthetic process was introducing titanium nitrate complex into template pores allowing it to dry, dehydrate, decompose, finally, form crystals in pores. It found that reaction concentration HNO3 used precursor had great effects crystallization TiO2. Removal silica templates after investigated. Crystallization cage-containing silicas,...

Porous single crystals of cubic Co3O4, NiO, In2O3 and CeO2 were fabricated using cage-containing SBA-16 FDU-12 as hard templates, characterized by X-ray powder diffraction, high-resolution transmission electron microscopy N2 adsorption/desorption. Unsuccessful synthesis non-cubic metal oxides implies that the symmetries oxide structures have a significant effect on crystal growth inside mesopore networks in these templates. A possible mechanism confined spherical cages is discussed.

Graphene-encapsulated mesoporous metal oxides (e.g. Co3O4, Cr2O3 and NiO) as novel anode materials for lithium-ion batteries were simply synthesized by adjusting the pH of graphene oxide suspensions to set values 5–6 oxides, 7–8 oxide) mixing two in presence reducing agents. These composites this facile method exhibited superior electrochemical performance, including remarkably high capacity, rate capability excellent cycle performance. The improved performance may be attributed dispersion...

Graphene-based metal oxides commonly show outstanding electrochemical performance due to the superior properties of graphene. However, as-formed decorated on graphene prefer disintegrate or aggregate together, and graphene–metal oxide hybrids also randomly themselves, resulting in capacity fading poor cycling stability. Herein, graphene-based are further protected by nanosheets through a stepwise heterocoagulation method, producing layered sandwich structure. Compared normal oxides,...

Two-dimensional (2D) materials, such as graphene, inorganic oxides, and hydroxides, are one of the most extensively studied classes materials due to their unilamellar crystallites or nanosheet structures. In this study, instead using universal exfoliation method bulky crystal precursor, 2D crystals/nanosheets MgAl-layered double hydroxides (LDHs) were synthesized in formamide. We propose that obtained crystals according XRD, TEM, AFM observations. The HRTEM fast Fourier transform images...

Mesoporous single-crystal Co(3)O(4) was obtained using cage-containing mesoporous silicas, FDU-12 and SBA-16, as templates characterised by XRD, HRTEM nitrogen adsorption-desorption while SQUID magnetometry used to probe the magnetic character.

Zeolitic jelly-donuts: Micron-sized cubes of zeolite A having a monocrystalline shell and an amorphous core were synthesized by in situ crystallization sodium aluminosilicate gel uncrosslinked chitosan hydrogel. Formation cubelike core–shell structures involves particle aggregation surface-to-core induced the hydrogel network, provides new model for nucleation growth mechanisms.

Porous carbons such as CMK-3 are commonly used matrices to accommodate metal oxides for the improvement of their electrochemical performance. However, mesostructure may be destroyed gradually with increase oxide content and some particles inevitably formed outside pores CMK-3, leading a gradual decrease in capacity poor cycling Herein, graphene-encapsulated CMK-3-metal (Fe3O4 NiO) synthesized through stepwise heterocoagulation method exhibit improved performances compared uncoated oxides....

Abstract Background Spodoptera frugiperda (JE Smith), or fall armyworm, is one of major migratory agricultural pests with a wide range hosts. The effect different hosts (maize and kidney bean) on the growth reproduction S. were investigated using age-stage, two-sex life table method. Results results showed that could complete its entire cycle both hosts, albeit significantly development reproduction. durations larval pupal prolonged whereas adult lifespan was shortened bean compared to...

Abstract Establishing the relationship between catalytic performance and material structure is crucial for developing design principles highly active catalysts. Herein, a type of perovskite fluoride, NH 4 MnF 3 , which owns strong‐field coordination including fluorine ammonia, in situ grown on carbon nanotubes (CNTs) used as model to study improve intrinsic activity through heteroatom doping strategies. This approach optimizes spin‐dependent orbital interactions alter charge transfer...