scholarly journals The effect of doping temperature on the nitrogen-bonding configuration of nitrogen-doped graphene by hydrothermal treatment

RSC Advances ◽  
2017 ◽  
Vol 7 (34) ◽  
pp. 20738-20741 ◽  
Author(s):  
Jun-ho Song ◽  
Chang-Min Kim ◽  
Euntae Yang ◽  
Moon-Ho Ham ◽  
In S. Kim
Keyword(s):  
Hydrothermal Treatment ◽  
Temperature Increase ◽  
Nitrogen Doped ◽  
As Doping ◽  
Bonding Configuration ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Pyridinic N ◽  
Effect Of Doping

As doping temperature increase, each type of nitrogen-bonding show the different tendencies. The pyrrolic-N has a high proportion, but a low relative with temperature. Despite smaller contents, the pyridinic-N play a prominent part.

scholarly journals The Synergistic Effect of Pyridinic Nitrogen and Graphitic Nitrogen of Nitrogen-Doped Graphene Quantum Dots for Enhanced TiO2 Nanocomposites’ Photocatalytic Performance

Catalysts ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 438 ◽  
Author(s):  
Fei Li ◽  
Ming Li ◽  
Yi Luo ◽  
Ming Li ◽  
Xinyu Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Performance ◽  
Uv Light ◽  
Graphene Quantum Dots ◽  
Hydrothermal Route ◽  
Ammonia Water ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Pyridinic N

In this study, nitrogen-doped graphene quantum dots (N-GQDs) and a TiO2 nanocomposite were synthesized using a simple hydrothermal route. Ammonia water was used as a nitrogen source to prepare the N-GQDs. When optically characterized by UV-vis, N-GQDs reveal stronger absorption peaks in the range of ultraviolet (UV) light than graphene quantum dots (GQDs). In comparison with GQDs/TiO2 and pure TiO2, the N-GQDs/TiO2 have significantly improved photocatalytic performance. In particular, it was found that, when the added amount of ammonia water was 50 mL, the content of pyridinic N and graphitic N were as high as 22.47% and 31.44%, respectively. Most important, the photocatalytic activity of N-GQDs/TiO2-50 was about 95% after 12 min. The results illustrated that pyridinic N and graphitic N play a significant role in photocatalytic performance.

Fabrication and Electrochemical Performance of Nitrogen-Doped Graphene Synthesized by Hydrothermal Method

2014 ◽  
Vol 804 ◽  
pp. 35-38
Author(s):  
Sen Liang ◽  
Min Luo ◽  
Yuan Yun Dou ◽  
Lei Guo ◽  
Bin Liang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Electrical Measurements ◽  
X Ray ◽  
Nitrogen Doped ◽  
Reduced Graphene ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Nitrogen Substitution ◽  
Pyridinic N

In this study, nitrogen doped graphene (NG) was prepared by using hydrothermal treatment of graphene oxide (GO) and ethylene diamine (EDA). The surface chemistry of the reduced graphene oxide (rGO) and the NG was investigated by the X-ray photoelectron spectroscopy (XPS). The results revealed that there were four kinds of nitrogen substitution: pyrollic N, pyridinic N, graphitic N and C-NH2. Further, the electrical measurements illustrated that the NG had superior capacitive performance than that of the rGO. Specifically, the maximum specific capacitance of NG was 200.6 F/g due to the double-layer capacitive and pseudocapacitive effect from the nitrogen-doped graphene. In addition, the present studies showed that the EDA was not only choose as nitrogen doping source but also played a key role in reduction.

Role of Pyridinic-N for Nitrogen-doped graphene quantum dots in oxygen reaction reduction

2017 ◽  
Vol 508 ◽  
pp. 154-158 ◽  
Author(s):  
Lang Sun ◽  
Yi Luo ◽  
Ming Li ◽  
Guanghui Hu ◽  
Yongjie Xu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Pyridinic N ◽  
Oxygen Reaction

Cycloaddition between nitrogen-doped graphene (6π-component) and benzene (4π-component): a theoretical approach using density functional theory with vdW-DF correction.

2021 ◽  
Author(s):  
Eduardo Rangel ◽  
José Alfredo Pescador Pescador Rojas ◽  
Victor A. Cardozo-Mata ◽  
Arturo Hernández-Hernández ◽  
Emmanuel Vallejo ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Theoretical Approach ◽  
Density Functional ◽  
Functional Theory ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Pyridinic N

The interaction between nitrogen-doped graphene defects (N3V1, N4V2 pyridinic, N3V1, N3V3 pyrrolic) and benzene have been investigated by applying density functional theory (DFT), together with the vdW–DF correction. We discovered...

scholarly journals Bipolar nitrogen-doped graphene frameworks as high-performance cathodes for lithium ion batteries

2017 ◽  
Vol 5 (4) ◽  
pp. 1588-1594 ◽  
Author(s):  
Yanshan Huang ◽  
Dongqing Wu ◽  
Arezoo Dianat ◽  
Manferd Bobeth ◽  
Tao Huang ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
High Performance ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Cycle Stability ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Pyridinic N

As cathode materials in lithium ion batteries, nitrogen-doped graphene frameworks (N-GFs) manifest excellent specific capacity and cycle stability, owing to the fast surface faradaic reactions of pyridinic N and pyridinic N-oxide with both p- and n-doped states.

scholarly journals Achieving Selective and Efficient Electrocatalytic Activity for CO2 Reduction on N-Doped Graphene

2021 ◽  
Vol 9 ◽  
Author(s):  
Xiaoxu Sun
Keyword(s):  
Free Energy ◽  
Density Functional ◽  
High Efficiency ◽  
Catalytic Mechanism ◽  
Ph Value ◽  
Great Promise ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Pyridinic N

The CO2 electrochemical reduction reaction (CO2RR) has been a promising conversion method for CO2 utilization. Currently, the lack of electrocatalysts with favorable stability and high efficiency hindered the development of CO2RR. Nitrogen-doped graphene nanocarbons have great promise in replacing metal catalysts for catalyzing CO2RR. By using the density functional theory (DFT) method, the catalytic mechanism and activity of CO2RR on 11 types of nitrogen-doped graphene have been explored. The free energy analysis reveals that the zigzag pyridinic N- and zigzag graphitic N-doped graphene possess outstanding catalytic activity and selectivity for HCOOH production with an energy barrier of 0.38 and 0.39 eV, respectively. CO is a competitive product since its free energy lies only about 0.20 eV above HCOOH. The minor product is CH3OH and CH4 for the zigzag pyridinic N-doped graphene and HCHO for zigzag graphitic N-doped graphene, respectively. However, for Z-pyN, CO2RR is passivated by too strong HER. Meanwhile, by modifying the pH value of the electrolyte, Z-GN could be selected as a promising nonmetal electrocatalyst for CO2RR in generating HCOOH.

Hydrothermal synthesis of nitrogen-doped graphene hydrogels using amino acids with different acidities as doping agents

2014 ◽  
Vol 2 (22) ◽  
pp. 8352-8361 ◽  
Author(s):  
Tao Wang ◽  
Luxiang Wang ◽  
Dongling Wu ◽  
Wei Xia ◽  
Hongyang Zhao ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Hydrothermal Synthesis ◽  
Electrochemical Performance ◽  
Nitrogen Doped ◽  
As Doping ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

Nitrogen-doped graphene hydrogels were synthesized using amino acids as doping agents. The acidity of the amino acid affects the morphology and ultimately the electrochemical performance of the material.

Flexible nitrogen-doped graphene/carbon nanotube/Co3O4 paper and its oxygen reduction activity

Nanoscale ◽  
2014 ◽  
Vol 6 (13) ◽  
pp. 7534-7541 ◽  
Author(s):  
Shan-Shan Li ◽  
Huai-Ping Cong ◽  
Ping Wang ◽  
Shu-Hong Yu
Keyword(s):  
Carbon Nanotube ◽  
Oxygen Reduction ◽  
Hydrothermal Treatment ◽  
Self Assembly ◽  
Large Scale ◽  
Assembly Process ◽  
Nitrogen Doped ◽  
Reduction Activity ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

A new kind of flexible, nitrogen-doped graphene/carbon nanotube/Co3O4 paper has been fabricated in large scale by a facile strategy that combines a self-assembly process with hydrothermal treatment, which shows potential as a promising oxygen reduction electrocatalyst.

scholarly journals Pyridinic and graphitic nitrogen-rich graphene for high-performance supercapacitors and metal-free bifunctional electrocatalysts for ORR and OER

RSC Advances ◽  
2017 ◽  
Vol 7 (29) ◽  
pp. 17950-17958 ◽  
Author(s):  
Shaikh Nayeem Faisal ◽  
Enamul Haque ◽  
Nikan Noorbehesht ◽  
Weimin Zhang ◽  
Andrew T. Harris ◽  
...  
Keyword(s):  
High Performance ◽  
Facile Synthesis ◽  
Nitrogen Doped ◽  
Metal Free ◽  
Bifunctional Electrocatalysts ◽  
Capacitance Performance ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Synthesized Materials ◽  
Pyridinic N

A facile synthesis of nitrogen-doped graphene with high atomic percentages of pyridinic N and graphitic N is reported. The synthesized materials show superior capacitance performance and metal-free bifunctional electrocatalysis of ORR and OER.

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