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Atomic cobalt on nitrogen-doped graphene for …

Here we report an electrocatalyst for hydrogen generation based on very small amounts of cobalt dispersed as individual atoms on nitrogen-doped graphene. This catalyst is robust and highly active in aqueous media with very low overpotentials (30 mV).

Atomic cobalt on nitrogen-doped graphene for …

The Fluorescent Quenching Mechanism of N and S Co …

The fluorescence intensity of N, S co-doped graphene quantum dots (N, S-GQDs) can be quenched by Fe3+ and Hg2+. Density functional theory (DFT) simulation and experimental studies indicate that the fluorescence quenching mechanisms for Fe3+ and Hg2+ detection are mainly attributed to the inner filter effect (IFE) and dynamic quenching process, respectively.

The Fluorescent Quenching Mechanism of N and S Co …

S, N Dual-Doped Graphene-like Carbon Nanosheets …

2017-1-11 · The S, N dual-doped graphene-like carbon nanosheets show enhanced activity toward ORR as compared with mono-doped counterparts, and excellent durability in contrast to the conventional Pt/C electrocatalyst in both alkaline and acidic media. A high content of graphitic-N and pyridinic-N is necessary for ORR electrocatalysis in the graphene-like ...

S, N Co-Doped Graphene Quantum Dots Decorated C …

2020-1-27 · Sulfur and nitrogen co-doped graphene quantum dots (SNGQDs) were synthesized using a hydrothermal method. The doping of S, N atoms and chemical bonding in SNGQDs has been investigated by XPS measur...

In situ formation of molecular Ni-Fe active sites on ...

Molecularly well-defined Ni sites at heterogeneous interfaces were derived from the incorporation of Ni2+ ions into heteroatom-doped graphene. The molecular Ni sites on graphene were redox-active. However, they showed poor activity toward oxygen evolution reaction (OER) in KOH aqueous solution. We demonstrated for the first time that the presence of Fe3+ ions in the solution could bond at the ...

Preparation of a Nitrogen-Doped Reduced Graphene …

As one of the key factors that limit the development of vanadium redox flow battery (VRFB), the positive redox couple of VO 2+ /VO 2 + plays an important role on the overall performance of VRFB. To improve the kinetics of a positive reaction, a new designed nitrogen-doped reduced graphene oxide-modified graphite felt (N-rGO/GF) electrode was prepared by coupling the methods of freeze-drying ...

Nitrogen-doped nanoporous graphene induced by a …

Rare earth separation is still a major challenge in membrane science. Nitrogen-doped nanoporous graphene (NDNG) is a promising material for membrane separation, but it has not yet been tested for rare earth separation, and it is limited by multi-complex synthesis.

Sulfur-doped graphene | S-Doped graphene | Sigma …

Sulfur-doped graphene; Synonym: S-Doped graphene; find Sigma-Aldrich-900528 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich.

Nitrogen-doped nanoporous graphene induced by a …

(PDF) Synthesis of N, F and S Co-Doped Graphene …

Synthesis of N, F and S Co-Doped Graphene Quantum Dots. May 2015; Nanoscale 7(27) DOI: 10.1039/C5NR02427G. Authors: Vijayamohanan K Pillai. ... substitutionally co-doped with N, F and S…

Nitrogen doped graphene quantum dots as a …

2019-2-1 · A highly selective fluorescent probe for Hg2+ is reported. It consists of nitrogen doped graphene quantum dots (NGQDs) that are nearly spherical in shape, have an average diameter of 2.7 nm and excitation-independent emission. The blue fluorescence of the NGQDs (with maximum excitation/emission at 378/447 nm) is quenched by Hg2+ due to both dynamic and static quenching.

Visualizing Individual Nitrogen Dopants in Monolayer …

Fig. 1. Raman, XPS, and STM spectra of N-doped graphene. (A) Raman spectra taken at pristine and N-doped (four different doping levels) graphene on a SiO 2 /Si substrate (20-μm laser spot) showing systematic changes in the spectra as a function of doping.A.U., arbitrary units. (B) NEXAFS (total electron yield) of pristine and N-doped graphene on copper foil at the N K-edge.

Piezoelectric sensor based on graphene-doped PVDF ...

The structural design of the self-powered PES based on GR-doped PVDF nanofibers is shown in Figure 1a.The cross section of the self-powered PES shows three parts, namely the GR-doped PVDF piezoelectric layer in the center, the electrode layer of Ti 3 C 2 MXene and Ag NWs on both sides, and the PDMS protective layer on the outermost sides. Each PVDF fiber contains GR doping.

Visualizing Individual Nitrogen Dopants in Monolayer …

NiCoMnO4 nanoparticles on N-doped graphene: …

1daysbefore · Abstract Low-cost and highly efficient electrocatalysts for oxygen reactions are of high importance for oxygen-related energy storage/conversion devices (e.g. Metal-O 2 batteries or fuel cells). In the present study, we synthesized NiCoMnO 4 nanoparticles anchored on nitrogen-doped graphene nanosheets as highly efficient bifunctional electrocatalysts for the Oxygen Reduction Reaction (ORR) …

Physics - Graphene Doping Reaches New Levels

Graphene is famous for its peculiar electronic properties exemplified by the Dirac point, a region in the material’s band structure where electron behavior resembles that of high-energy particles. An electron carrying charge through graphene in a Dirac-like fashion acts like a single particle that barely interacts with its many peers.

First-principles investigation of carbon dioxide ...

2020-12-8 · We predict the CO 2 gas molecule absorption and sensing performance of transitional MN 4 (M = Sc, Ti, V, Cr, Mn, Co, Ni, Cu, and Zn) doped graphene by a systematic first-principles investigation based on density functional theory. Our results demonstrate that graphene doped with different transition metals, MN 4, produce similar adsorption behaviors and electronic structures of carbon dioxide.

Ultrasensitive gas detection of large-area boron …

The gas-sensing performance of graphene could be remarkably enhanced by incorporating dopants into its lattice based on theoretical calculations. However, to date, experimental progress on boron-doped graphene (BG) is still very scarce. Here, we achieved the controlled growth of large-area, high-crystallinity BG sheets and shed light on their electronic features associated with boron dopants ...

Doped graphene sheets as anode materials with …

The doped graphene shows a high reversible capacity of >1040 mAh g(-1) at a low rate of 50 mA g(-1). More importantly, it can be quickly charged and discharged in a very short time of 1 h to several tens of seconds together with high-rate capability and excellent long-term cyclability. For example, a very high capacity of ∼199 and 235 mAh g ...

Electronic properties of chemically doped graphene

Chemical doping of graphene is the most robust way of modifying graphene's electronic properties. We review here the results obtained so far on the electronic structure and transport properties of chemically doped graphene, focusing on the results obtained with scanning tunneling microscopy/spectroscopy (STM/S), angle-resolved photoemission spectroscopy (ARPES), and magnetoresistance measurements.

Highly Fluorescent Nitrogen-Doped Graphene …

Nitrogen-doped graphene quantum dots (N-GQDs) with strong blue fluorescence and a high quantum yield of 88.9% were synthesized via a facile one-pot hydrothermal treatment with citric acid (CA) and ethylenediamine (EDA) as carbon and nitrogen sources, respectively. The blue fluorescence emission is independent of the excitation wavelengths.