Topic
Carbon
About: Carbon is a research topic. Over the lifetime, 129882 publications have been published within this topic receiving 2718066 citations. The topic is also known as: element 6 & C.
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TL;DR: In this paper, the authors reported the preparation of micro-mesoporous carbon monolithic xerogels by means of a two-step approach that comprises (1) hydrothermal carbonization of glucose in the presence of graphene oxide (GO) sheets as morphology-directing agents and (2) chemical activation of the resulting hydrated carbon (HTC) with KOH.
65 citations
TL;DR: In this article, an effective and robust non-noble metal oxygen reduction reaction (ORR) catalyst based on N, S co-doped carbon materials with abundant surface active sites was introduced.
Abstract: Developing highly active non-noble metal oxygen reduction reaction (ORR) catalysts is crucial for a variety of renewable energy applications including fuel cells and metal–air batteries. Heteroatom doped carbon materials, known as metal-free catalysts, show potential applications in the ORR, and may be promising replacement candidates for expensive, scarce platinum catalysts. Despite the inspiring progress made, the performance of the current metal-free carbon catalysts is still far from satisfactory for large-scale applications. Herein, we introduce an effective and robust ORR catalyst based on N, S co-doped carbon materials with abundant surface active sites. Electrochemical results indicate that the incorporation of sulfur into nitrogen-doped carbon (S-NCx) can dramatically improve the stability of the catalyst by improving the selectivity of O2 electro-reduction to H2O. Density functional theory calculations reveal that sulfur doping lowers the energy barrier of O2(ads) hydrogenation to form OOH(ads), thus leading to enhanced intrinsic activity. In particular, the correlation between ORR activity and nitrogen and sulfur species in these materials is studied in-depth, and it is found the ORR performance of S-NCx catalysts is significantly affected by pyridinic N and C–S–C contents.
65 citations
TL;DR: In this paper, the magnetic properties of iron carbide nanoparticles embedded in a carbon matrix were investigated using pyrolysis of organic precursors using thermal assisted chemical vapour deposition method.
Abstract: Here we report on the magnetic properties of iron carbide nanoparticles embedded in a carbon matrix. The granular distribution of nanoparticles in an inert matrix, of potential use in various application, were prepared by pyrolysis of organic precursors using thermal assisted chemical vapour deposition method. By varying the precursor concentration and preparation temperature, compositions with varying iron concentration and nanoparticle sizes were made. Powder X-ray diffraction, Transmission Electron Microscopy and MAossbauer spectroscopy studies revealed, the nanocrystalline iron carbide (Fe3C) presence in the partially-graphitized matrix. The dependence of magnetic properties on the particle size and temperature (10 K
65 citations
TL;DR: In this paper, the heat of fusion, heat of transition, specific heat, molecular refraction calculated by means of the Lorentz-Lorenz equation, boiling point under reduced pressure and heat of evaporation and viscosity are given for a number of normal and branched alkanes and a cyclane, all having more than 20 carbon atoms.
Abstract: The heat of fusion, heat of transition, specific heat, molecular refraction calculated by means of the Lorentz-Lorenz equation, boiling point under reduced pressure, heat of evaporation and viscosity are given for a number of normal and branched alkanes and a cyclane, all having more than 20 carbon atoms.
The crystallographic properties of n-heneicosane and n-tetracosane at different temperatures are discussed.
65 citations
65 citations