Electrodeposition of reduced graphene oxide onto gold electrodes: creating thin electrochemically active and optically transparent overlayers

2019 ◽  
Vol 319 ◽  
pp. 649-656 ◽  
Author(s):  
Yan Li ◽  
Isaac Martens ◽  
Karen C. Cheung ◽  
Dan Bizzotto
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Gold Electrodes ◽  
Reduced Graphene ◽  
Electrochemically Active ◽  
Optically Transparent

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.

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 “Click” Chemistry on Gold Electrodes Modified with Reduced Graphene Oxide by Electrophoretic Deposition

Surfaces ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 193-204 ◽  
Author(s):  
Vladyslav Mishyn ◽  
Patrik Aspermair ◽  
Yann Leroux ◽  
Henri Happy ◽  
Wolfgang Knoll ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Click Chemistry ◽  
Reduced Graphene Oxide ◽  
Electrophoretic Deposition ◽  
Potassium Ferrocyanide ◽  
Gold Electrodes ◽  
Redox Mediators ◽  
Sensing Platforms ◽  
Reduced Graphene ◽  
Vapor Treatment

The coating of electrical interfaces with reduced graphene oxide (rGO) films and their subsequent chemical modification are essential steps in the fabrication of graphene-based sensing platforms. In this work, electrophoretic deposition (EPD) of graphene oxide at 2.5 V for 300 s followed by vapor treatment were employed to coat gold electrodes uniformly with rGO. These interfaces showed excellent electron transfer characteristics for redox mediators such as ferrocene methanol and potassium ferrocyanide. Functional groups were integrated onto the Au/rGO electrodes by the electro-reduction of an aryldiazonium salt, 4-((triisopropylsilyl)ethylenyl)benzenediazonium tetrafluoroborate (TIPS-Eth-ArN) in our case. Chemical deprotection of the triisopropylsilyl function resulted in propargyl-terminated Au/rGO electrodes to which azidomethylferrocene was chemically linked using the Cu(I) catalyzed “click” chemistry.

Capacitance enhancement by electrochemically active benzene derivatives for graphene-based supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (102) ◽  
pp. 84113-84118 ◽  
Author(s):  
Zhen-Kun Wu ◽  
Ziyin Lin ◽  
Liyi Li ◽  
Bo Song ◽  
Chia-Chi Tuan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Benzene Derivatives ◽  
Aromatic Molecules ◽  
Reduced Graphene ◽  
Electrochemically Active

Various aromatic molecules have been reported to improve the performance of reduced graphene oxide (rGO)-based supercapacitors.

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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