Octahedral high voltage LiNi0.5Mn1.5O4 spinel cathode: enhanced capacity retention of hybrid aqueous capacitors with nitrogen doped graphene

2015 ◽  
Vol 3 (23) ◽  
pp. 12386-12395 ◽  
Author(s):  
R. Aswathy ◽  
T. Kesavan ◽  
K. T. Kumaran ◽  
P. Ragupathy
Keyword(s):  
High Voltage ◽  
Capacity Retention ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Good Contact ◽  
Spinel Cathode

A new hybrid aqueous supercapacitor (HSC) has been constructed using electrospun octahedral LiNi0.5Mn1.5O4 as the cathode and nitrogen doped graphene as the anode. HSC exhibits remarkable capacity retention upon cycling due to the presence of (111) planes on the surface of facets offering good contact between the electrodes and electrolyte.

A high voltage cathode of Na2+2xFe2−x(SO4)3 intensively protected by nitrogen-doped graphene with improved electrochemical performance of sodium storage

2018 ◽  
Vol 6 (10) ◽  
pp. 4354-4364 ◽  
Author(s):  
Wei Wang ◽  
Xiaohao Liu ◽  
Qunjie Xu ◽  
Haimei Liu ◽  
Yong-Gang Wang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
High Voltage ◽  
Nitrogen Doped ◽  
Storage Performance ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Sodium Storage

A high voltage alluaudite sulfate Na2+2xFe2−x(SO4)3 composited with nitrogen-doped graphene and the sodium storage performance is remarkably improved.

High-voltage aqueous symmetric supercapacitor based on 3D bicontinuous, highly-wrinkled, N-doped porous graphene-like ultrathin carbon sheets

2022 ◽  
Author(s):  
Boran Tao ◽  
Na Zhang ◽  
Tian Ye ◽  
Pengfei Gao ◽  
Hongda Li ◽  
...  
Keyword(s):  
High Voltage ◽  
Mantis Shrimp ◽  
Nitrogen Doped ◽  
Porous Graphene ◽  
Shrimp Shell ◽  
Symmetric Supercapacitor ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Carbon Sheet

In this study, a facile pyrolysis is utilized to convert mantis shrimp shell into 3D bicontinuous porous, highly wrinkled, nitrogen doped, graphene-like ultrathin carbon sheet (3D BWGC). 3D BWGC achieves...

scholarly journals Supercapacitive Performance of N-Doped Graphene/Mn3O4/Fe3O4 as an Electrode Material

2019 ◽  
Vol 9 (6) ◽  
pp. 1040 ◽  
Author(s):  
Beng Chong ◽  
Nur Azman ◽  
Muhammad Mohd Abdah ◽  
Yusran Sulaiman
Keyword(s):  
Charge Transfer ◽  
X Ray Diffraction ◽  
Capacity Retention ◽  
Supercapacitive Performance ◽  
X Ray ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Transfer Behavior ◽  
A Current

Nitrogen-doped graphene (NDG) and mixed metal oxides have been attracting much attention as the combination of these materials resulted in enhanced electrochemical properties. In this study, a composite of nitrogen-doped graphene/manganese oxide/iron oxide (NDG/Mn3O4/Fe3O4) for a supercapacitor was prepared through the hydrothermal method, followed by freeze-drying. Field emission scanning electron microscopy (FESEM) images revealed that the NDG/Mn3O4/Fe3O4 composite displayed wrinkled-like sheets morphology with Mn3O4 and Fe3O4 particles attached on the surface of NDG. The presence of NDG, Mn3O4, and Fe3O4 was characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The electrochemical studies revealed that the NDG/Mn3O4/Fe3O4 composite exhibited the highest specific capacitance (158.46 F/g) compared to NDG/Fe3O4 (130.41 F/g), NDG/Mn3O4 (147.55 F/g), and NDG (74.35 F/g) in 1 M Na2SO4 at a scan rate of 50 mV/s due to the synergistic effect between bimetallic oxides, which provide richer redox reaction and high conductivity. The galvanostatic charge discharge (GCD) result demonstrated that, at a current density of 0.5 A/g, the discharging time of NDG/Mn3O4/Fe3O4 is the longest compared to NDG/Mn3O4 and NDG/Fe3O4, indicating that it had the largest charge storage capacity. NDG/Mn3O4/Fe3O4 also exhibited the smallest resistance of charge transfer (Rct) value (1.35 Ω), showing its excellent charge transfer behavior at the interface region and good cyclic stability by manifesting a capacity retention of 100.4%, even after 5000 cycles.

scholarly journals Nitrogen-Doped Graphene Iron-Based Particle Electrode Outperforms Activated Carbon in Three-Dimensional Electrochemical Water Treatment Systems

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3121
Author(s):  
Hosna Ghanbarlou ◽  
Nikoline Loklindt Pedersen ◽  
Morten Enggrob Simonsen ◽  
Jens Muff
Keyword(s):  
Activated Carbon ◽  
Three Dimensional ◽  
Cell Voltage ◽  
Reduction Reaction ◽  
Process Data ◽  
Nitrogen Doped ◽  
Pesticide Removal ◽  
Optimal Value ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

The synergy between electrochemical oxidation and adsorption on particle electrodes was investigated in three-dimensional (3D) systems for p-nitrosodimethylaniline (RNO) decolorization and pesticide removal. A comparison was made between granular activated carbon (GAC) and a novel synthesized nitrogen-doped graphene-based particle electrode (NCPE). Experiments on RNO decolorization show that the synergy parameter of the 3D-NCPE system was improved 3000 times compared to the studied 3D-GAC system. This was due to the specific nanostructure and composition of the NCPE material. Nitrogen-doped graphene triggered an oxygen reduction reaction, producing hydrogen peroxide that simultaneously catalyzed on iron sites of the NCPEs to hydroxyl radicals following the electro-Fenton (EF) process. Data showed that in the experimental setup used for the study, the applied cell voltage required for the optimal value of the synergy parameter could be lowered to 5V in the 3D-NCPEs process, which is significantly better than the 15–20 V needed for synergy to be found in the 3D-GAC process. Compared to previous studies with 3D-GAC, the removal of pesticides 2,6 dichlorobenzamide (BAM), 2-methyl-4-chlorophenoxyaceticacid (MCPA), and methylchlorophenoxypropionic acid (MCPP) was also enhanced in the 3D-NCPE system.

scholarly journals CoMn phosphide encapsulated in nitrogen-doped graphene for electrocatalytic hydrogen evolution over a broad pH range

2021 ◽  
Author(s):  
Jingjing Liu ◽  
Wenyao Li ◽  
Zhe Cui ◽  
Jiaojiao Li ◽  
Fang Yang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Core Shell ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Ph Range ◽  
Excellent Stability

A core–shell CoMn-P@NG heterostructure electrode demonstrated impressive performance of hydrogen evolution over a broad pH range and maintained excellent stability.

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