scholarly journals Metal-free catalysis based on nitrogen-doped carbon nanomaterials: a photoelectron spectroscopy point of view

2018 ◽  
Vol 9 ◽  
pp. 2015-2031 ◽  
Author(s):  
Mattia Scardamaglia ◽  
Carla Bittencourt
Keyword(s):  
Carbon Nanotubes ◽  
Surface Science ◽  
Photoelectron Spectroscopy ◽  
Carbon Nanomaterials ◽  
State Of The Art ◽  
Point Of View ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon ◽  
Scientific Questions

In this review, we discuss the use of doped carbon nanomaterials in catalysis, a subject that is currently intensively studied. The availability of carbon nanotubes since the 1990’s and of graphene ten years later prompted the development of novel nanotechnologies. We review this topic linking fundamental surface science to the field of catalysis giving a timely picture of the state of the art. The main scientific questions that material scientists have addressed in the last decades are described, in particular the enduring debate on the role of the different nitrogen functionalities in the catalytic activity of nitrogen-doped carbon nanotubes and graphene.

scholarly journals Hydrothermal Activation of Porous Nitrogen-Doped Carbon Materials for Electrochemical Capacitors and Sodium-Ion Batteries

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2163 ◽  
Author(s):  
Yuliya V. Fedoseeva ◽  
Egor V. Lobiak ◽  
Elena V. Shlyakhova ◽  
Konstantin A. Kovalenko ◽  
Viktoriia R. Kuznetsova ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Nanomaterials ◽  
Carbon Materials ◽  
Sodium Ion ◽  
Carbon Surface ◽  
Energy Storage And Conversion ◽  
Sodium Ion Batteries ◽  
X Ray ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

Highly porous nitrogen-doped carbon nanomaterials have distinct advantages in energy storage and conversion technologies. In the present work, hydrothermal treatments in water or ammonia solution were used for modification of mesoporous nitrogen-doped graphitic carbon, synthesized by deposition of acetonitrile vapors on the pyrolysis products of calcium tartrate. Morphology, composition, and textural characteristics of the original and activated materials were studied by transmission electron microscopy, X-ray photoelectron spectroscopy, near-edge X-ray absorption fine structure spectroscopy, infrared spectroscopy, and nitrogen gas adsorption method. Both treatments resulted in a slight increase in specific surface area and volume of micropores and small mesopores due to the etching of carbon surface. Compared to the solely aqueous medium, activation with ammonia led to stronger destruction of the graphitic shells, the formation of larger micropores (1.4 nm vs. 0.6 nm), a higher concentration of carbonyl groups, and the addition of nitrogen-containing groups. The tests of nitrogen-doped carbon materials as electrodes in 1M H2SO4 electrolyte and sodium-ion batteries showed improvement of electrochemical performance after hydrothermal treatments especially when ammonia was used. The activation method developed in this work is hopeful to open up a new route of designing porous nitrogen-doped carbon materials for electrochemical applications.

scholarly journals Nitrogen-doped carbon nanotubes coated with zinc oxide nanoparticles as sulfur encapsulator for high-performance lithium/sulfur batteries

2018 ◽  
Vol 9 ◽  
pp. 1677-1685 ◽  
Author(s):  
Yan Zhao ◽  
Zhengjun Liu ◽  
Liancheng Sun ◽  
Yongguang Zhang ◽  
Yuting Feng ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Zinc Oxide ◽  
Photoelectron Spectroscopy ◽  
Zinc Oxide Nanoparticles ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Oxide Nanoparticles ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon ◽  
Lithium Sulfur

Nitrogen-doped carbon nanotubes coated with zinc oxide nanoparticles (ZnO@NCNT) were prepared via a sol–gel route as sulfur encapsulator for lithium/sulfur (Li/S) batteries. The electrochemical properties of the S/ZnO@NCNT composite cathode were evaluated in Li/S batteries. It delivered an initial capacity of 1032 mAh·g−1 at a charge/discharge rate of 0.2C and maintained a reversible capacity of 665 mAh·g−1 after 100 cycles. The coulombic efficiency of the cathode remains unchanged above 99%, showing stable cycling performance. X-ray photoelectron spectroscopy analysis confirmed the formation of S–Zn and S–O bonds in the composite. This indicates that an enhanced cycling and rate capability of the S/ZnO@NCNT composite could be ascribed to advantages of the ZnO@NCNT matrix. In the composite, the active ZnO-rich surfaces offer a high sulfur-bonding capability and the NCNT core acts as a conductive framework providing pathways for ion and electron transport. The as-prepared S/ZnO@NCNT composite is a promising cathode material for Li/S batteries.

TiO2 composited with carbon nanofibers or nitrogen-doped carbon nanotubes synthesized using coal fly ash as a catalyst: bisphenol-A photodegradation efficiency evaluation

2018 ◽  
Vol 42 (6) ◽  
pp. 4531-4542 ◽  
Author(s):  
Lerato Hlekelele ◽  
Paul J. Franklyn ◽  
Farai Dziike ◽  
Shane H. Durbach
Keyword(s):  
Carbon Nanotubes ◽  
Fly Ash ◽  
Bisphenol A ◽  
Carbon Nanomaterials ◽  
Coal Fly Ash ◽  
Efficiency Evaluation ◽  
Photocatalytic Efficiency ◽  
Nitrogen Doped ◽  
Photodegradation Efficiency ◽  
Nitrogen Doped Carbon

The photocatalytic efficiency of TiO2 was improved by compositing it with carbon nanomaterials synthesized using a waste material, fly ash.

Nitrogen-doped carbon nanotubes encapsulating Fe/Zn nanoparticles as a persulfate activator for sulfamethoxazole degradation: role of encapsulated bimetallic nanoparticles and nonradical reaction

2020 ◽  
Vol 7 (5) ◽  
pp. 1444-1453 ◽  
Author(s):  
Shang Yanan ◽  
Xu Xing ◽  
Qinyan Yue ◽  
Baoyu Gao ◽  
Yanwei Li
Keyword(s):  
Carbon Nanotubes ◽  
Bimetallic Nanoparticles ◽  
One Pot ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon ◽  
Zn Nanoparticles

In this work, the carbon nanotubes (CNTs) encapsulating Zn and Fe bimetallic nanoparticles (FeZn@NC) were synthesized through a one-pot pyrolytic strategy.

Beneficial role of the nitrogen-doped carbon nanotubes in the synthesis of the active palladium supported catalyst

2019 ◽  
Vol 98 ◽  
pp. 107484
Author(s):  
Ekaterina V. Matus ◽  
Arina N. Suboch ◽  
Alexander S. Lisitsyn ◽  
Dmitry A. Svintsitskiy ◽  
Evgeny Modin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Supported Catalyst ◽  
Nitrogen Doped ◽  
Beneficial Role ◽  
Palladium Supported Catalyst ◽  
Nitrogen Doped Carbon

Pyridine-grafted nitrogen-doped carbon nanotubes achieving efficient electroreduction of CO2 to CO within a wide electrochemical window

2022 ◽  
Author(s):  
Yuning Zhang ◽  
Hao Jiang ◽  
Dongfang Niu ◽  
Manke Ingo ◽  
Chao Yang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Adsorption Capacity ◽  
Electrochemical Reduction ◽  
Carbon Nanomaterials ◽  
Nitrogen Doped ◽  
Electrochemical Window ◽  
Weak Adsorption ◽  
Reduction Of Co2 ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbon nanomaterials for electrochemical reduction of CO2 (CO2ER) to CO have been extensively investigated, evaluated, and applied recently. Nevertheless, their weak adsorption capacity for CO2 usually results in a...

scholarly journals Using nitrogen-doped carbon nanotubes as a catalyst support for selective hydrogenation of cinnamaldehyde

2017 ◽  
Vol 20 (K1) ◽  
pp. 20-27
Author(s):  
Truong Huu Tri ◽  
Nguyen Dinh Lam
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Selective Hydrogenation ◽  
Photoelectron Spectroscopy ◽  
Catalyst Support ◽  
Chemical Vapor ◽  
Active Phase ◽  
Chemical Vapor Deposition Method ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbon nanotubes (N-CNTs) has been applied in different areas for over two last decade thanks to their novel properties. In this work, N-CNTs were produced by using chemical vapor deposition method, this material was used as catalyst support for nanoparticles paladi (Pd) catalyst. The support and catalyst Pd/N-CNTs were characterized by several techniques including Raman spectrum, X-ray photoelectron spectroscopy (XPS), nitrogen adsorption - desorption isotherms (BET), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The catalyst was tested for the selective hydrogenation of cinnamaldehyde (CAL), The result of this study shows that the catalyst Pd/N-CNTs exhibits a high selectivity towards the C=C bond, over 91% of hydrocinnamaldehyde (HCAL) obtained at about 70% of CAL conversion. The obtained results also show that the present nitrogen atoms in the carbon architecture and functional groups of oxygen in the N-CNTs material have altered the surface properties, as enhancing the dispersion and anchoring active phase on the surface of the support.

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