Enhanced capacitance properties of nitrogen doped reduced graphene oxide obtained by simultaneous reduction and nitrogen doping

FlatChem ◽  
2018 ◽  
Vol 11 ◽  
pp. 24-31 ◽  
Author(s):  
P. Bharathidasan ◽  
Mustapha Balarabe Idris ◽  
Dong-Won Kim ◽  
S.R. Sivakkumar ◽  
S. Devaraj
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Nitrogen Doping ◽  
Simultaneous Reduction ◽  
Nitrogen Doped ◽  
Reduced Graphene

scholarly journals Effect of Nitrogen Doping on the Optical Bandgap and Electrical Conductivity of Nitrogen-Doped Reduced Graphene Oxide

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6424
Author(s):  
Gunawan Witjaksono ◽  
Muhammad Junaid ◽  
Mohd Haris Khir ◽  
Zaka Ullah ◽  
Nelson Tansu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Nitrogen Doping ◽  
Spectroscopic Analysis ◽  
Hall Effect Measurement ◽  
Optical Bandgap ◽  
Suitable Material ◽  
Nitrogen Doped ◽  
Reduced Graphene

Graphene as a material for optoelectronic design applications has been significantly restricted owing to zero bandgap and non-compatible handling procedures compared with regular microelectronic ones. In this work, nitrogen-doped reduced graphene oxide (N-rGO) with tunable optical bandgap and enhanced electrical conductivity was synthesized via a microwave-assisted hydrothermal method. The properties of the synthesized N-rGO were determined using XPS, FTIR and Raman spectroscopy, UV/vis, as well as FESEM techniques. The UV/vis spectroscopic analysis confirmed the narrowness of the optical bandgap from 3.4 to 3.1, 2.5, and 2.2 eV in N-rGO samples, where N-rGO samples were synthesized with a nitrogen doping concentration of 2.80, 4.53, and 5.51 at.%. Besides, an enhanced n-type electrical conductivity in N-rGO was observed in Hall effect measurement. The observed tunable optoelectrical characteristics of N-rGO make it a suitable material for developing future optoelectronic devices at the nanoscale.

Oxygen-deficient and nitrogen-doped MnO2 nanowire-reduced graphene oxide–cellulose nanofibril aerogel electrodes for high-performance asymmetric supercapacitors

2018 ◽  
Vol 6 (47) ◽  
pp. 24407-24417 ◽  
Author(s):  
Qifeng Zheng ◽  
Ruosen Xie ◽  
Liming Fang ◽  
Zhiyong Cai ◽  
Zhenqiang Ma ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Density ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Nitrogen Doping ◽  
Oxygen Vacancies ◽  
Cellulose Nanofibril ◽  
Asymmetric Supercapacitors ◽  
Nitrogen Doped ◽  
Reduced Graphene

Oxygen vacancies and nitrogen doping dramatically enhance the conductivity and capacitive performance of the MnO2 and MoO3 nanowires, leading to superb energy density and cycling stability of the asymmetric supercapacitors.

Hexamethylenetetramine mediated simultaneous nitrogen doping and reduction of graphene oxide for a metal-free SERS substrate

RSC Advances ◽  
2014 ◽  
Vol 4 (83) ◽  
pp. 44146-44150 ◽  
Author(s):  
Barun Kumar Barman ◽  
Karuna Kar Nanda
Keyword(s):  
Graphene Oxide ◽  
Hydrothermal Synthesis ◽  
Metal Ions ◽  
Reduced Graphene Oxide ◽  
Ag Nanoparticles ◽  
Nitrogen Doping ◽  
Sers Substrate ◽  
Nitrogen Doped ◽  
Metal Free ◽  
Reduced Graphene

We report the hydrothermal synthesis of nitrogen doped reduced graphene oxide (N-rGO) and Ag nanoparticles (NPs) decorated N-rGO from graphene oxide (GO), metal ions and hexamethylenetetramine.

scholarly journals Reduced Graphene Oxide-Supported Pt-Based Catalysts for PEM Fuel Cells with Enhanced Activity and Stability

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 256
Author(s):  
Irina V. Pushkareva ◽  
Artem S. Pushkarev ◽  
Valery N. Kalinichenko ◽  
Ratibor G. Chumakov ◽  
Maksim A. Soloviev ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Surface Area ◽  
Pem Fuel Cells ◽  
Polyol Process ◽  
Proton Exchange ◽  
Active Surface Area ◽  
Electrochemical Performances ◽  
Simultaneous Reduction ◽  
Reduced Graphene

Platinum (Pt)-based electrocatalysts supported by reduced graphene oxide (RGO) were synthesized using two different methods, namely: (i) a conventional two-step polyol process using RGO as the substrate, and (ii) a modified polyol process implicating the simultaneous reduction of a Pt nanoparticle precursor and graphene oxide (GO). The structure, morphology, and electrochemical performances of the obtained Pt/RGO catalysts were studied and compared with a reference Pt/carbon black Vulcan XC-72 (C) sample. It was shown that the Pt/RGO obtained by the optimized simultaneous reduction process had higher Pt utilization and electrochemically active surface area (EASA) values, and a better performance stability. The use of this catalyst at the cathode of a proton exchange membrane fuel cell (PEMFC) led to an increase in its maximum power density of up to 17%, and significantly enhanced its performance especially at high current densities. It is possible to conclude that the optimized synthesis procedure allows for a more uniform distribution of the Pt nanoparticles and ensures better binding of the particles to the surface of the support. The advantages of Pt/RGO synthesized in this way over conventional Pt/C are the high electrical conductivity and specific surface area provided by RGO, as well as a reduction in the percolation limit of the components of the electrocatalytic layer due to the high aspect ratio of RGO.

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