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Carbon dots, as one of carbon-based nanomaterials, with excellent fluorescent properties and low toxicity show great potential in bio-science and bio-technology. Here, we grew mung bean sprouts with different concentration of carbon dots (CDs) and studied the plant growth and photosynthesis. We found CDs show a dose-response effect on the growth of mung bean sprouts, including root elongation, stem...
Non-noble, high-efficient electrodes with excellent durability are desirable for water splitting. Herein, a facile strategy has been proposed to in-situ grow nitrogen-doped carbon dots (NCDs) decorated Ni3S2 on Ni foam (NCDs/Ni3S2/NF) by hydrothermal treatment of Ni foam in water solution of thiourea and NCDs. Interestingly, coral-like NCDs/Ni3S2/NF composites are unprecedentedly prepared without...
Enormous research efforts have been made in the field of design and fabrication of material structure of supercapacitors because of the high complexity in obtaining both high energy and power density. Herein, a hierarchical structure of a Co3O4@ biomass-derived carbon fiber @Co3O4 (@BCF@), which consists of hollow porous carbon fiber as the sandwich layer and Co3O4 particles both as an internal shell...
Fe-N-doped porous carbon derived from petroleum asphalt (NPCA) was prepared via a facile template synthesis method, with urea as nitrogen source while α-Fe2O3 nanoparticles as template and Fe source. The as-prepared NPCA calcined at 900 °C (NPCA-900) exhibits excellent electrocatalytic performance with high diffusion-limiting current density and stability comparable to those of commercial Pt/C catalysts...
Fluorinated 2D porous graphene-based materials, FPGMs, were synthesized by using porous activated graphene material as raw material. The fluorination of PGM was activated through the introduction of meso- and micropores which generated a large number of vacancy, edges and defects. The fluorinated sample FPGM-10 with a F/C ratio of 0.67 was obtained at room temperature. Meanwhile, the temperate fluorination...
Applying bio-imaging in bacterial viability assessment is vital to human health. Nitrogen, phosphorus co-doped carbon dots (NPCDs) with high visible fluorescence and tunable negative charges were synthesized by a feasible hydrothermal reaction. The as-prepared NPCDs possess abundant surface functional groups, excellent photostability and bio-compatibility. Especially, the surface negative charges...
Carbon foam nanowires (CFNWs), which are mixed sp2/sp3 hybridized microporous one-dimensional structures, have received much attention in the past two decades. In the present work, first-principle and molecular dynamics (MD) calculations revealed that the surface states causes the metallicity of CFNWs with small size, which demonstrates a Dirac cone-like dispersion near Γ in the Brillouin zone, while...
Interlayer expanded MoS2 grown on graphene nanoribbon aerogel (GNRA) has been synthesized and used as anode material for high performance lithium and sodium ion batteries (LIBs, SIBs). The edge effect of graphene nanoribbons including the enormous oxygen functional groups and the insertion of edge carbon layers leads to the formation of MoS2 with large interlayer spacing. The expansion boosts the...
Hybrid graphene aerogels (HGA) consisting of graphene oxide (GO) and graphene nanoplatelets (GNP) were prepared and introduced into polyethylene glycol (PEG) via vacuum impregnation, aiming at obtaining composite phase change materials (PCMs) with high thermal conductivity, outstanding shape-stabilization, high energy storage density, commendable thermal repeatability and the ability to light-to-heat...
An in-situ pyrolytic and polymerizable method was investigated to grow carbon nano-fibers/tubes (CNF/CNT) without metal-catalysts. The 3 mol % yttria-stabilized zirconia hollow fiber membranes (3YSZ-HFM) were used as supports for growing the CNF/CNT. The polyethersulfone (PES) and polyvinylpyrrolidone (PVP) were used as polymer binders and carbon sources. The as-grown CNF (formed at 1250 °C/4h) had...
We developed a facile hydrothermal method to fabricate the carbon quantum dots (CQDs)/MoS2 composite as hydrogen evolution reduction (HER) catalyst. After irradiation with visible light for 30 min, the CQDs/MoS2 composite (as CQDs/MoS2-L30) performed improved HER activity, featured by a small overpotential of ∼0.125 V at 10 mA cm−2, a high current density, a small Tafel slope of 45 mV/decade and a...
A series of nitrogen-doped carbon/Ketjenblack (KB) composites is synthesized by pyrolyzing nitrogen-containing ionic liquid (IL) on KB. The obtained composites have a significant effect on the morphology of Li2O2 in nonaqueous Li–air batteries. As the surface catalytic layer, the nitrogen-doped carbon significantly enhances the discharge capacity to >9905 mAh g−1 in artificial dry air, comparable...
Nitrogen-doped porous carbons (NPCs) with high hydrogen sulfide (H2S) adsorption capacity have been prepared through the molten-salt approach, using d-glucose as carbon source, melamine as nitrogen source and eutectic salt (LiCl/KCl) as porogen. The NPCs possess tunable nitrogen content (3.07–24.31 wt.%) and specific surface area (451–1190 m2/g) with the changing of the weight ratio of nitrogen source...
Nanocomposites based on transition metal oxides (Co3O4, etc.) and carbon nanostructures with low-cost, high activity and good stability are promising catalysts toward electrochemical water oxidation, which is desirable but remains challenging. Here, we report the design and synthesis of nanocomposite based on carbon quantum dots (CQDs), SnO2 and Co3O4 (CQDs/SnO2–Co3O4) as the electrocatalyst for highly...
N-doped carbon dots (NCDs) obtained by one-step reflux treatment of C3N4 with ethane diamine possess good water dispersibility, strong visible fluorescence, low toxicity, proton adsorption capacity, and photo-induced electron-accepting/donating abilities. Based on these unique properties, we demonstrate that the obtained NCDs can be used as a good fluorescent probe for cellar imaging without any further...
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