On the electroreduction mechanism of halobenzenes: Detection of intermediates in reduction of monohalobenzenes

1989 ◽  
Vol 54 (4) ◽  
pp. 900-910 ◽  
Author(s):  
Juan Casado ◽  
Iluminada Gallardo
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Behaviour ◽  
Experimental Results ◽  
Disk Electrode ◽  
Rotating Ring Disk Electrode ◽  
Mercury Cathode

Experimental results from electrochemical behaviour of halobenzenes in DMF at a mercury cathode are used to discuss alternative mechanisms of reduction. Intermediates of these mechanisms, such as phenyl anion, phenylmercury radical and phenylmercury cation have been detected at the electrode by using cyclic voltammetry and a rotating ring-disk electrode.

On the electroreduction mechanism of halobenzenes: The special case of 1,2-dibromobenzene

1989 ◽  
Vol 54 (4) ◽  
pp. 911-921 ◽  
Author(s):  
Juan Casado ◽  
Manuel Ortega ◽  
Iluminada Gallardo
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Reduction ◽  
Theoretical Calculations ◽  
Experimental Results ◽  
Disk Electrode ◽  
Stepwise Mechanism ◽  
Rotating Ring Disk Electrode ◽  
Controlled Potential Electrolysis ◽  
Controlled Potential ◽  
Special Case

Reinvestigation of the electrochemical reduction of 1,2-dibromobenzene by polarography, cyclic voltammetry, rotating ring-disk electrode voltammetry and controlled potential electrolysis, as well as theoretical calculations, leads to the proposal of a stepwise mechanism. Experimental results for bromobenzene and 1,3-dibromobenzene are also reported for comparison.

Studies on the Reduction Mechanism of Oxygen on Ag/C Catalysts in Alkaline Solutions

2013 ◽  
Vol 10 (6) ◽  
Author(s):  
Jia-Jun Han ◽  
De-Li Liu ◽  
Lin Geng
Keyword(s):  
Cyclic Voltammetry ◽  
Coordination Polymer ◽  
Oxygen Reduction Reaction ◽  
Reduction Reaction ◽  
Alkaline Solutions ◽  
Test Results ◽  
Reduction Mechanism ◽  
Disk Electrode ◽  
Rotating Ring Disk Electrode ◽  
Crystallite Sizes

Carbon-supported silver (Ag/C) catalysts with different Ag contents are prepared using the Ag (I) coordination polymer, [Ag(C7H6NO2)(C6H12N4)(H2O)]n. The mechanism and activity of the oxygen reduction reaction (ORR) on these Ag/C catalysts are investigated by the cyclic voltammetry and the rotating ring disk electrode (RRDE) in alkaline solutions. The test results indicate that, under the same Ag crystallite sizes, the activities increase with increasing Ag contents from 5 to 20 wt.% and the ORR proceeds by a four-electron pathway on Ag/C catalysts, but with decreasing Ag contents, the ORR is catalyzed via the four-electron pathway and the two-electron pathway simultaneously.

scholarly journals Fabrication of electrochemical biosensors for the determination of phenolic compounds by experimental and computational methods

2018 ◽  
Author(s):  
◽  
Kwanele Winterose Kunene
Keyword(s):  
Electron Microscopy ◽  
Cyclic Voltammetry ◽  
Computational Methods ◽  
Limit Of Detection ◽  
Electrochemical Behaviour ◽  
Zno Nanorods ◽  
Experimental Results ◽  
Bisphenol S ◽  
Experimental Conditions

The polyphenolic compounds of interest, bisphenol A (BPA) and its analogue bisphenol S (BPS) used in the plastic industry to manufacture baby bottles and beverage containers, were used in this study. They are generally used in the manufacture of polycarbonates, epoxy resins and unsaturated polystyrene resins. There is a growing concern in the public and scientific community about these organic compounds due to their endocrine disrupting activity and negative toxic impact on the wildlife. This has encouraged scientists to embark on research to find a sensitive and selective technique that will adequately determine these compounds even in trace amounts. The experimental research strategy adopted in this work was supported by computational methods. This work was conducted in two stages; Firstly, a sensitive EC biosensor was developed using a carbon screen printed electrode fabricated with the combination of silver doped zinc oxide nanoparticles with multiwalled carbon nanotubes (MWCNTs) and laccase enzyme. The EC behaviour of BPA towards the fabricated biosensor was investigated using cyclic voltammetry and differential pulse voltammetry under optimum experimental conditions. Secondly, a novel and selective PEC sensor was developed for the first time to detect BPS based on the vertically aligned ZnO nanorods (ZnO NRs) with a molecularly imprinted polypyrrole (PPy). Amperometric, cyclic voltammetry and impedance spectroscopy were used for the investigation of the photo induced electrochemical behaviour of BPS. Different characterisation techniques such as ultra-violet visible spectroscopy, fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, photoluminescence, Raman spectroscopy, grazing incidence X-ray diffraction and diffuse reflectance were used to characterize the synthesized nanostructures. Results revealed that the fabricated EC and PEC sensors exhibited good catalytic activity towards the determination of BPA and BPS respectively, in samples extracted from plastic water bottles. For the EC method, a low detection limit of 0.08 μM for BPA in a linear range 0.5 to 2.99 µM was detected. However, in the case of BPS, a highly selective PEC method was attained linearly ranging from 2.5 to 12.5 µM with a much higher limit of detection of 0.7 μM. Experimental results were further supported computationally for a better understanding of the optical properties of ZnO NRs-polypyrrole complex. Computational results were in good agreement with experimental results.

Sign in / Sign up

Export Citation Format

Share Document