Nitrogen doped multi walled carbon nanotubes produced by CVD-correlating XPS and Raman spectroscopy for the study of nitrogen inclusion

Sharifi, Tiva; Nitze, Florian; Barzegar, Hamid Reza; Tai, Cheuk‐Wai; Mazurkiewicz, Michał; Małolepszy, Artur; Stobiński, Leszek; Wågberg, Thomas

doi:10.1016/j.carbon.2012.03.022

Cited by 278 publications

(154 citation statements)

References 39 publications

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“…The high wave number region in Raman spectra of both samples (Fig. 2b) comprises a D-band and a G-band region and can be fitted by a 4-peak model with peaks at 1,185, 1,339, 1,470 and 1,584 cm À 1 in agreement with previous reports of nitrogendoped carbon nanostructures 26,27 .…”

Section: Resultssupporting

confidence: 89%

Formation of nitrogen-doped graphene nanoscrolls by adsorption of magnetic γ-Fe2O3 nanoparticles

et al. 2013

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Graphene nanoscrolls are Archimedean-type spirals formed by rolling single-layer graphene sheets. Their unique structure makes them conceptually interesting and understanding their formation gives important information on the manipulation and characteristics of various carbon nanostructures. Here we report a 100% efficient process to transform nitrogen-doped reduced graphene oxide sheets into homogeneous nanoscrolls by decoration with magnetic g-Fe 2 O 3 nanoparticles. Through a large number of control experiments, magnetic characterization of the decorated nanoparticles, and ab initio calculations, we conclude that the rolling is initiated by the strong adsorption of maghemite nanoparticles at nitrogen defects in the graphene lattice and their mutual magnetic interaction. The nanoscroll formation is fully reversible and upon removal of the maghemite nanoparticles, the nanoscrolls return to open sheets. Besides supplying information on the rolling mechanism of graphene nanoscrolls, our results also provide important information on the stabilization of iron oxide nanoparticles.

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Section: Resultssupporting

confidence: 89%

Formation of nitrogen-doped graphene nanoscrolls by adsorption of magnetic γ-Fe2O3 nanoparticles

et al. 2013

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“…From Fig. 3c, the pyridine nitrogen atom has been found to be the main form of nitrogen in the asprepared nitrogen-doped graphene sheets [16,37].…”

Section: Microstructural Characterizationmentioning

confidence: 93%

Superhigh capacity and rate capability of high-level nitrogen-doped graphene sheets as anode materials for lithium-ion batteries

Cai

Lian

Zhu

et al. 2013

Electrochimica Acta

115

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“…The N1s spectra of the pyrolyzed NMWNT material is deconvoluted to the three main peaks. The first two peaks located at $400.7 and $398.4 eV are attributed to the graphitic and pyridinic nitrogen, respectively, while the third peak at $402.6 eV corresponds to the protonized imine nitrogen [54][55][56][57]. All spectra require an additional wide component around 406 eV representing various oxides and satellite structures.…”

Section: Investigating the Catalytic Active Sites Of The Nmwnt Catalymentioning

confidence: 99%

Straightforward synthesis of nitrogen-doped carbon nanotubes as highly active bifunctional electrocatalysts for full water splitting

Davodi

Tavakkoli

Lahtinen

et al. 2017

Journal of Catalysis

111

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a b s t r a c tThe success of intermittent renewable energy systems relies on the development of energy storage technologies. Particularly, active and stable water splitting electrocatalysts operating in the same electrolyte are required to enhance the overall efficiency and reduce the costs. Here we report a precise and facile synthesis method to control nitrogen active sites for producing nitrogen doped multi-walled carbon nanotube (NMWNT) with high activity toward both oxygen and hydrogen evolution reactions (OER and HER). The NMWNT shows an extraordinary OER activity, superior to the most active non-metal based OER electrocatalysts. For OER, the NMWNT requires overpotentials of only 320 and 360 mV to deliver current densities of 10 and 50 mA cm À2 in 1.0 M NaOH, respectively. This metal-free electrocatalyst also exhibits a proper performance toward HER with a moderate overpotential of 340 mV to achieve a current density of 10 mA cm À2 in 0.1 M NaOH. This catalyst also shows high stability after long-time water oxidation without notable changes in the structure of the material. It is revealed that the electron-withdrawing pyridinic N moieties in the NMWNTs could serve as the active sites for OER and HER. Our findings open up new avenues for the development of metal-free electrocatalysts for full water splitting.

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Nitrogen doped multi walled carbon nanotubes produced by CVD-correlating XPS and Raman spectroscopy for the study of nitrogen inclusion

Cited by 278 publications

References 39 publications

Formation of nitrogen-doped graphene nanoscrolls by adsorption of magnetic γ-Fe2O3 nanoparticles

Formation of nitrogen-doped graphene nanoscrolls by adsorption of magnetic γ-Fe2O3 nanoparticles

Superhigh capacity and rate capability of high-level nitrogen-doped graphene sheets as anode materials for lithium-ion batteries

Straightforward synthesis of nitrogen-doped carbon nanotubes as highly active bifunctional electrocatalysts for full water splitting

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