Three-dimensional graphene network assisted high performance dye sensitized solar cells

Recent Progress of Metal Carbides Encapsulated in Carbon‐Based Materials for Electrocatalysis of Oxygen Reduction Reaction

Fe3C-C core-shell nanoparticles were fabricated on a large scale by metal-organic chemical vapor deposition at 700 °C with ferric acetylacetonate as the precursor. Analysis results of x-ray diffraction, transmission electron microscope and Raman spectroscope showed that the Fe3C cores with an average diameter of ∼35 nm were capsulated by the graphite-like C layers with the thickness of 2-5 nm. The comparative experiments revealed that considerable Fe3O4-Fe3C core-shell nanoparticles and C nanotubes were generated simultaneously at 600 and 800 °C, respectively. A formation mechanism was proposed for the as-synthesized core-shell nanostructures, based on the temperature-dependent catalytic activity of Fe3C nanoclusters and the coalescence process of Fe3C-C nanoclusters. The Fe3C-C core-shell nanoparticles exhibited a saturation magnetization of 23.6 emu g(-1) and a coercivity of 550 Oe at room temperature.

http://iopscience.iop.org/article/10.1088/0957-4484/26/8/085601/pdf

Synthesis and magnetic properties of Fe3C-C core-shell nanoparticles

Iron carbide (Fe3C) nanoparticles have been successfully synthesized by combining low-temperature combustion synthesis method with carbothermal reduction. A homogeneous precursor powder (Fe2O3 + C) derived from iron nitrate, glycine, and glucose mixed solution was subsequently calcined under nitrogen at 450°C–700°C for 2 h. Effects of glucose on the size and morphology of the precursors as well as the synthesized Fe3C powders were studied in details. The results showed a regular variation in the particle size and morphology of the precursors and Fe3C powders with the increasing molar ratio of glucose to iron nitrate (G/Fe). XRD analysis indicated that the initial transformation of the precursor for (G/Fe = 1) to Fe3C occurred at 500°C. Meanwhile, magnetic properties of the Fe3C have been tested by vibrating sample magnetometer (VSM). The saturation magnetization (Ms) of Fe3C powders synthesized using different G/Fe ratios (G/Fe = 1, 2, 3) was 51.2, 37.0, and 27.1 emu/g, respectively. This made the Fe3C a promising candidate for magnetic materials.

Effect of Glucose on the Synthesis of Iron Carbide Nanoparticles from Combustion Synthesis Precursors

High-quality graphene and amorphous pyrolytic carbon are deposited on Cu and silica, respectively, by atmospheric pressure chemical vapor deposition (APCVD). Growth mechanisms and influences from varied kinetic factors on the two products are analyzed and discussed. The gas-phase reaction is the decisive factor for the growth of pyrolytic carbon on silica because of poor catalytic dehydrogenation of the substrate (the electron structure of silica is the fundamental reason), while the surface reaction plays a determining role in the deposition of graphene on Cu. The formed graphene efficiently separates the substrate and aromatic hydrocarbons (AHs, gaseous products) to avoid the deposition of amorphous carbon on Cu. High H2 concentration acts as a kinetic inhibitor for both products. For the Cu substrate, H2 competes with CH4 to occupy surface active sites because of its high solubility in Cu. Moreover, excess H atoms decrease graphene quality by acting as a core for the formation of sp3 bonded carbon atom...

Growth Mechanism and Influences from Kinetic Factors on Carbon Materials with Cu and Silica Substrates during Atmospheric Pressure Chemical Vapor Deposition

An easy method for the preparation of core–shell structural Fe3C@graphite-like carbon hollow spheres

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An easy method for the preparation of core–shell structural Fe3C@graphite-like carbon hollow spheres