Covalent attachment of diphosphine ligands to glassy carbon electrodes via Cu-catalyzed alkyne-azide cycloaddition. Metallation with Ni(ii)

2015 ◽  
Vol 44 (27) ◽  
pp. 12225-12233 ◽  
Author(s):  
Atanu K. Das ◽  
Mark H. Engelhard ◽  
Sheri Lense ◽  
John A. S. Roberts ◽  
R. Morris Bullock
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrode Surface ◽  
Click Reaction ◽  
Covalent Attachment ◽  
Carbon Electrodes ◽  
Diphosphine Ligands ◽  
Carbon Electrode ◽  
Glassy Carbon Electrodes

Covalent tethering of a P2N2 ligand to a planar, azide-terminated glassy carbon electrode surface was accomplished using a CuI-catalyzed “click” reaction, followed by metallation with NiII.

scholarly journals Electrochemical Glucose Oxidation Using Glassy Carbon Electrodes Modified with Au-Ag Nanoparticles: Influence of Ag Content

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Nancy Gabriela García-Morales ◽  
Luis Alfonso García-Cerda ◽  
Bertha Alicia Puente-Urbina ◽  
Leonor María Blanco-Jerez ◽  
René Antaño-López ◽  
...  
Keyword(s):  
Glassy Carbon ◽  
Electrode Surface ◽  
Glucose Oxidation ◽  
Modified Electrodes ◽  
Alkaline Media ◽  
Carbon Electrodes ◽  
X Ray Diffraction ◽  
Simple Method ◽  
Glassy Carbon Electrodes ◽  
Transmission Electron

This paper describes the application of glassy carbon modified electrodes bearing Aux-Agynanoparticles to catalyze the electrochemical oxidation of glucose. In particular, the paper shows the influence of the Ag content on this oxidation process. A simple method was applied to prepare the nanoparticles, which were characterized by transmission electron microscopy, Ultraviolet-Visible spectroscopy, X-ray diffraction spectroscopy, and cyclic voltammetry. These nanoparticles were used to modify glassy carbon electrodes. The effectiveness of these electrodes for electrochemical glucose oxidation was evaluated. The modified glassy carbon electrodes are highly sensitive to glucose oxidation in alkaline media, which could be attributed to the presence of Aux-Agynanoparticles on the electrode surface. The voltammetric results suggest that the glucose oxidation speed is controlled by the glucose diffusion to the electrode surface. These results also show that the catalytic activity of the electrodes depends on the Ag content of the nanoparticles. Best results were obtained for the Au80-Ag20nanoparticles modified electrode. This electrode could be used for Gluconic acid (GA) production.

scholarly journals Effect of Anodic Pretreatment on the Performance of Glassy Carbon Electrode in Acetonitrile and Electrooxidation of Para-substituted Phenols in Acetonitrile on Platinum and Glassy Carbon Electrode

2019 ◽  
Vol 65 (1) ◽  
pp. 133-138 ◽  
Author(s):  
László Kiss ◽  
Sándor Kunsági-Máté
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrode Surface ◽  
Platinum Electrode ◽  
Anodic Peak ◽  
Carbon Electrode ◽  
Substituted Phenols ◽  
Cyclic Voltammetric ◽  
Pretreatment Time

In the first part of the work electropolymerisation of phenol was studied at glassy carbon electrode. Rapid fouling of its surface indicated the formation of coherent poly(phenyleneoxide) layer which was demonstrated by the repeated cyclic voltammetric scans. Effect of anodic pretreatment potential in acetonitrile solvent was also investigated and the results showed that at potentials higher than 2 V glassy carbon electrode becomes deactivated. Preanodisation of glassy carbon electrode at 3 V in acetonitrile resulted in diminished anodic peak currents by phenols. It was due to the partial deactivation of electrode surface and its extent increased with the pretreatment time. The electrooxidation of para-substituted phenols (p-Cl-phenol, p-NO2-phenol, p-tertbutylphenol, p-methoxyphenol) in acetonitrile resulted in no fouling layer on platinum electrode and the peak currents were significantly higher than in the first scan of unsubstituted phenol in the same concentration. Glassy carbon deactivated continuously by repeating the scans due to the solvent and bonding of products on the surface.

Simultaneous detection of hydroquinone and catechol with decreasing pH at a bare glassy carbon electrode surface

2019 ◽  
Vol 11 (5) ◽  
pp. 604-609 ◽  
Author(s):  
Jianhua Fan ◽  
Junjie Pang ◽  
Yue Zhang ◽  
Lijuan Zhang ◽  
Wenwen Xu ◽  
...  
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrode Surface ◽  
Simultaneous Detection ◽  
Carbon Electrode ◽  
Bare Glassy Carbon Electrode ◽  
Decreasing Ph

Hydroquinone (HQ) and catechol (CC) are two isomers, which often coexist and interfere with each other during their identification in samples.

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