Organic multi-electron redox couple-induced functionalization for enabling ultrahigh rate and cycling performances of supercapacitors

2017 ◽  
Vol 5 (48) ◽  
pp. 25420-25430 ◽  
Author(s):  
Ning An ◽  
Zhongai Hu ◽  
Hongying Wu ◽  
Yuying Yang ◽  
Ziqiang Lei ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Active Material ◽  
Redox Couple ◽  
Graphene Oxide Nanosheets ◽  
Reduced Graphene ◽  
Electrochemically Active ◽  
One Step ◽  
Cycling Performances ◽  
Redox Centers

Danthron (DT) with multi-electron redox centers as a novel organic electrochemically active material for supercapacitors has been decorated on reduced graphene oxide nanosheets (RGNs) via a facile one-step reflux method.

Preparation of PdxAuy bimetallic nanostructures with controllable morphologies supported on reduced graphene oxide nanosheets and wrapped in a polypyrrole layer

RSC Advances ◽  
2015 ◽  
Vol 5 (107) ◽  
pp. 87831-87837 ◽  
Author(s):  
Tongjie Yao ◽  
Quan Zuo ◽  
Hao Wang ◽  
Jie Wu ◽  
Xiao Zhang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Reduced Graphene Oxide ◽  
Graphene Oxide Nanosheets ◽  
Step Method ◽  
Reduced Graphene ◽  
One Step ◽  
Good Catalytic Activity ◽  
Alloy Nanostructures ◽  
Bimetallic Nanostructures

A one-step method to prepare reduced graphene oxide/PdxAuy/polypyrrole composites with good catalytic activity was introduced. The morphologies of alloy nanostructures could turn to be spherical, coral-like and porous cluster-like.

Tiny Basic Nickel Carbonate Arrays/Reduced Graphene Oxide Composite for High-Efficiency Supercapacitor Application

NANO ◽  
2019 ◽  
Vol 14 (04) ◽  
pp. 1950044 ◽  
Author(s):  
Zhengmin Yu ◽  
Xiaoli Su ◽  
Denghu Wei ◽  
Shu-Juan Yao ◽  
Huiyan Ma ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Efficiency ◽  
Active Material ◽  
3D Structure ◽  
Graphene Oxide Nanosheets ◽  
Supercapacitor Application ◽  
Nickel Carbonate ◽  
Reduced Graphene ◽  
Excellent Stability

3D structure composite made of tiny basic nickel carbonate arrays on the surface of reduced graphene oxide nanosheets (G-NiCH) are prepared by the hydrothermal method. The specific surface area of the G-NiCH composites is twice that of single basic nickel carbonate, which is due to the tiny basic nickel carbonate arrays structure wherein each individual nanoneedle is about 20[Formula: see text]nm in length and 2[Formula: see text]nm in width. The G-NiCH electrodes display high-efficiency electrochemical performance with good specific capacitance (1230[Formula: see text]F[Formula: see text]g[Formula: see text]) and excellent stability (100% capacitance retention after 2000 cycles). This is attributed to the synergistic effect that reduced graphene oxide offer fast electron transmission path and basic nickel carbonate act as high effective active material.

Nonaqueous Lithium-Ion Capacitors with High Energy Densities using Trigol-Reduced Graphene Oxide Nanosheets as Cathode-Active Material

ChemSusChem ◽  
2013 ◽  
Vol 6 (12) ◽  
pp. 2240-2244 ◽  
Author(s):  
Vanchiappan Aravindan ◽  
Dattakumar Mhamane ◽  
Wong Chui Ling ◽  
Satishchandra Ogale ◽  
Srinivasan Madhavi
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Active Material ◽  
Lithium Ion ◽  
High Energy ◽  
Graphene Oxide Nanosheets ◽  
Reduced Graphene

scholarly journals A Laser Reduced Graphene Oxide Grid Electrode for the Voltammetric Determination of Carbaryl

2021 ◽  
Author(s):  
Muhammad Saqib ◽  
Elena V. Dorozhko ◽  
Jiri Barek ◽  
Vlastimil Vyskocil ◽  
Elena Korotkova ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Fruit Juices ◽  
Grid Electrode ◽  
Oxidation Current ◽  
Reduced Graphene ◽  
Electrochemically Active ◽  
One Step ◽  
Ph Range

Laser reduced graphene oxide (LRGO) on a PET substrate was prepared in one-step to obtain the LRGO grid electrode for sensitive carbaryl determination. The grid form results in a grid distribution of different electrochemically active zones affecting the electroactive substance diffusion towards to the electrode surface and increasing the electrochemical sensitivity for carbaryl determination. Carbaryl is electrochemically irreversibly oxidized by the secondary amine moiety of the molecule with the loss of one proton and one electron in the pH range from 5 to 7 by LSV on the LRGO grid electrode with a scan rate of 300 mV/s. Some interference of the juice matrix molecules did not significantly affect the LSV oxidation current of carbaryl on the LRGO grid electrode after adsorptive accumulation without applied potential. The LRGO grid electrode can be used for LSV determination of carbaryl in fruit juices in the concentration range from 0.25 to 128 mg/L with LOD of 0.1 mg/L by. The fabrication of the LRGO grid electrode opens up possibilities for further inexpensive monitoring of carbaryl in other fruit juices and fruits.

scholarly journals A Laser Reduced Graphene Oxide Grid Electrode for the Voltammetric Determination of Carbaryl

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 5050
Author(s):  
Muhammad Saqib ◽  
Elena V. Dorozhko ◽  
Jiri Barek ◽  
Vlastimil Vyskocil ◽  
Elena I. Korotkova ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Fruit Juices ◽  
Grid Electrode ◽  
Oxidation Current ◽  
Reduced Graphene ◽  
Electrochemically Active ◽  
One Step ◽  
Ph Range

Laser-reduced graphene oxide (LRGO) on a polyethylene terephthalate (PET) substrate was prepared in one step to obtain the LRGO grid electrode for sensitive carbaryl determination. The grid form results in a grid distribution of different electrochemically active zones affecting the electroactive substance diffusion towards the electrode surface and increasing the electrochemical sensitivity for carbaryl determination. Carbaryl is electrochemically irreversibly oxidized at the secondary amine moiety of the molecule with the loss of one proton and one electron in the pH range from 5 to 7 by linear scan voltammetry (LSV) on the LRGO grid electrode with a scan rate of 300 mV/s. Some interference of the juice matrix molecules does not significantly affect the LSV oxidation current of carbaryl on the LRGO grid electrode after adsorptive accumulation without applied potential. The LRGO grid electrode can be used for LSV determination of carbaryl in fruit juices in the concentration range from 0.25 to 128 mg/L with LOD of 0.1 mg/L. The fabrication of the LRGO grid electrode opens up possibilities for further inexpensive monitoring of carbaryl in other fruit juices and fruits

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