Effect of pyrrolic-N defects on the capacitance and magnetization of nitrogen-doped multiwalled carbon nanotubes

Sánchez-Salas, Roque; Kashina, Svetlana; Galindo, Rosario; Cuentas-Gallegos, Ana Karina; Rayón-López, Nelly; Miranda-Hernández, M.; Fuentes‐Ramírez, Rosalba; López–Urías, Florentino; Muñoz‐Sandoval, Emilio

doi:10.1016/j.carbon.2021.07.033

Cited by 29 publications

(4 citation statements)

References 113 publications

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“…Graphitic N replaces a carbon atom in the carbon layer's hexagonal structure. [34] The percentage of pyridinic, pyrrolic, and graphitic N atoms was 21 %, 38 % and 41 % in Cu-NC 1:1 , 28 %, 44 % and 28 % in Cu-NC 2:1 , 16 %, 40 % and 44 % in Cu-NC 1:2 , and 32 %, 33 % and 35 % in NC respectively as shown in Figure 3b. A relatively uniform distribution of N configurations existed in NC.…”

Section: Resultsmentioning

confidence: 86%

“…Pyridinic‐N is usually found in vacancies and pyrrolic‐N is associated to the incorporation of N atoms into a five‐member heterocyclic ring. Graphitic N replaces a carbon atom in the carbon layer‘s hexagonal structure [34] . The percentage of pyridinic, pyrrolic, and graphitic N atoms was 21 %, 38 % and 41 % in Cu‐NC 1:1 , 28 %, 44 % and 28 % in Cu‐NC 2:1 , 16 %, 40 % and 44 % in Cu‐NC 1:2 , and 32 %, 33 % and 35 % in NC respectively as shown in Figure 3b.…”

Section: Resultsmentioning

confidence: 99%

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A Nitrogen‐Doped Porous Carbon Supported Copper Catalyst from a Scalable One‐Step Method for Efficient Carbon Dioxide Electroreduction

et al. 2022

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In this work, a scalable one-step glucose blowing method has been used to prepare a porous N-doped carbon supported Cu nanoparticles (Cu-NC) composite catalyst for CO 2 electroreduction. This Cu-NC catalyst demonstrates efficient catalytic activity for CO 2 -to-C1 product (CO and formate) conversion, with a high efficiency of 69 % at an overpotential of 590 mV. The excellent catalytic activity is correlated to the structure of this composite and the N-species (pyridinic and graphitic nitrogen) in the carbonaceous matrix that may promote the CO 2 adsorption and subsequent formation of reduction reaction intermediates and products.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

A Nitrogen‐Doped Porous Carbon Supported Copper Catalyst from a Scalable One‐Step Method for Efficient Carbon Dioxide Electroreduction

et al. 2022

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“…Notably, the pyrrole nitrogen configuration accounts for the largest proportion of the three nitrogen configurations in the N 1s deconvoluted spectrum. The hydrogen atoms attached to the carbon atoms near the pyrrole nitrogen defects tend to form electron-rich environments, 27 which tend to attract positively charged materials. N-doped graphene with surface functional groups (−OH, N−H, etc.)…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Efficient Structural Regulation Platform for the Controlled Synthesis of LiFePO₄ Cathodes with Shorter Li-Ion Diffusion Paths

Zheng,

Bei,

Zhou

et al. 2024

Langmuir

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The rate performance of lithium iron phosphate (LiFePO 4 ) is mainly limited by its poor electronic conductivity and slow Li-ion diffusion rate. Graphene-based materials are often compounded with LiFePO 4 (LFP) to improve their rate performance, mainly because of their excellent electrical conductivity. Unlike most past composite work focusing on the conductive network between LFP and graphene, in this work, we further developed the functionality of graphene-based materials as nanoparticle carriers, where the nitrogen-doping strategy endows graphene with properties that make it an efficient structural regulation platform during the solvothermal process. Compared to reduced graphene oxide, not only does the nitrogen-doped sites confer more nucleation growth sites for LFP on the graphene surface during the solvothermal process, but also the localized formation of an EG-enriched microenvironment helps to further inhibit the in situ growth of LFP along [010]. The efficient structural regulation platform assisted the synthesis of (010)-oriented LFP with a smaller particle size, which further shortens the Li-ion diffusion paths. The optimized LFP composite electrode materials exhibit a discharge-specific capacity of 133.1 mA•h/g at 10C, which exceeds/is comparable to that of previously reported LFP compounded with graphene-based materials. This work broadens the functionality of graphene-based carriers and provides new ideas for the controllable synthesis of nanoparticles.

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“…In recent years, the number of publications on XPS studies of nitrogen-doped carbon nanotubes (N-CNTs) has been rapidly increasing due to high prospects for the use of N-CNTs for energy conversion and storage [18][19][20][21][22]. The electrical properties and catalytic activity of N-CNTs significantly depend on the concentration of doping nitrogen and its distribution according to the incorporation type in the N-CNT structure between pyrrole-, graphite-, and pyridine-like nitrogen [23][24][25][26][27]. The method of XPS makes it possible to characterize with high accuracy the type of chemical bonds of doping nitrogen with carbon and to establish the dependence of the N-CNT properties on the type of nitrogen incorporation.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Synchrotron and Laboratory X-ray Sources in Photoelectron Spectroscopy Experiments for the Study of Nitrogen-Doped Carbon Nanotubes

Il’ina,

Khubezhov,

Polyvianova

et al. 2023

QuBS

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The chemical composition and stoichiometry of vertically aligned arrays of nitrogen-doped multi-walled carbon nanotubes (N-CNTs) were studied by photoelectron spectroscopy using laboratory and synchrotron X-ray sources. We performed careful deconvolution of high-resolution core-level spectra to quantify pyridine/pyrrole-like defects in N-CNTs, which are a key factor in the efficiency of the piezoelectric response for this material. It is shown that the XPS method makes it possible to estimate the concentration and type of nitrogen incorporation (qualitatively and quantitatively) in the “N-CNT/Mo electrode” system using both synchrotron and laboratory sources. The obtained results allow us to study the effect of the nickel catalytic layer thickness on the concentration of pyridine/pyrrole-like nitrogen and piezoelectric response in the nanotubes.

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Effect of pyrrolic-N defects on the capacitance and magnetization of nitrogen-doped multiwalled carbon nanotubes

Cited by 29 publications

References 113 publications

A Nitrogen‐Doped Porous Carbon Supported Copper Catalyst from a Scalable One‐Step Method for Efficient Carbon Dioxide Electroreduction

A Nitrogen‐Doped Porous Carbon Supported Copper Catalyst from a Scalable One‐Step Method for Efficient Carbon Dioxide Electroreduction

Efficient Structural Regulation Platform for the Controlled Synthesis of LiFePO₄ Cathodes with Shorter Li-Ion Diffusion Paths

Comparison of Synchrotron and Laboratory X-ray Sources in Photoelectron Spectroscopy Experiments for the Study of Nitrogen-Doped Carbon Nanotubes

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Effect of pyrrolic-N defects on the capacitance and magnetization of nitrogen-doped multiwalled carbon nanotubes

Cited by 29 publications

References 113 publications

A Nitrogen‐Doped Porous Carbon Supported Copper Catalyst from a Scalable One‐Step Method for Efficient Carbon Dioxide Electroreduction

A Nitrogen‐Doped Porous Carbon Supported Copper Catalyst from a Scalable One‐Step Method for Efficient Carbon Dioxide Electroreduction

Efficient Structural Regulation Platform for the Controlled Synthesis of LiFePO4 Cathodes with Shorter Li-Ion Diffusion Paths

Comparison of Synchrotron and Laboratory X-ray Sources in Photoelectron Spectroscopy Experiments for the Study of Nitrogen-Doped Carbon Nanotubes

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Efficient Structural Regulation Platform for the Controlled Synthesis of LiFePO₄ Cathodes with Shorter Li-Ion Diffusion Paths