Current and potential oscillations during the electro-oxidation of bromide ions

Bell, Jeffrey G.; Wang, Jichang

doi:10.1016/j.jelechem.2015.07.016

Cited by 18 publications

(13 citation statements)

References 32 publications

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“…The second oxidation is accounted to the oxidation of these tribromide species to bromine, which was in accordance with previous reports. [57][58][59][60] The electrochemical bromination is assumed to occur via the formation of the reactive bromonium ion intermediates which then undergo nucleophilic ring opening by the free bromide anions resulting in the desired products. The reaction is complemented by the cathodic reduction of water to generate hydrogen gas.…”

Section: Resultsmentioning

confidence: 99%

Selective Electrochemical Dibromination of Terpenes and Naturally Derived Olefins

et al. 2022

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A simple electrochemical protocol is established for the selective alkene dibromination of naturally derived olefins, such as terpenes. The use of hazardous Br 2 or its analogues have been elegantly avoided by employing readily available, inexpensive, and harmless sodium bromide with a dual role as reagent and supporting electrolyte in combination with sustainable carbon-based electrodes. This electrochemical protocol provides the desired products with good to excellent yields up to 82 % with 10 examples. Scalability has been proved by a 5fold scale-up. Notably, higher yields and selectivity were achieved in comparison to conventional bromination by Br 2 and DMSO/HBr system and the dibrominated compound was eligible for further functionalization, such as cyanation according to the Kolbe nitrile synthesis protocol.

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Section: Resultsmentioning

confidence: 99%

Selective Electrochemical Dibromination of Terpenes and Naturally Derived Olefins

et al. 2022

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“…The Br2 shows two wavelength peaks one at 287nm and one at 386nm. These peaks have been reported before by a few authors (see e.g Bell [85] ). In his study, Bell reported the wavelengths at 285nm and 390nm.…”

Section: Uv Vis Analysis Of Charge Experiments For Bromide Oxidationsupporting

confidence: 85%

Energy Storage Technologies for Off-grid Houses

Pulido¹,

Fernando²

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“…From the features, we can conclude that HER oscillation is an ERDC type. [29][30][31] Furthermore, I-E curves measured at fast scan rates met the criterion for the type that was suggested by Li et al, 31 i.e., crossing curves were obtained when the potential was scanned at 0.5 V s ¹1 or faster, as shown in Fig. 8.…”

Section: Mechanism Of Her Oscillationmentioning

confidence: 53%

“…Other than the typical oscillators, there are five types of oscillators, namely, strictly potentiostatic type, S-shaped NDR (S-NDR) type, 27 coupled N-NDR (CN-NDR) type, 25,26 capacitance mediated positive differential resistance (C-PDR) type, 28,29 and electrochemical reactions and diffusion-convection (ERDC) type. 30,31 Besides, as described above, there is another one: bubble growth and detachment type.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Potential Oscillation during Electrolysis of Water in Acidic Solutions

et al. 2020

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We have previously reported that the hydrogen evolution reaction (HER) in acidic water electrolysis shows a potential oscillation with amplitude of about 1 V. The oscillation, named HER oscillation, is accompanied with a periodic change in the evolution rate of hydrogen bubbles, i.e., hydrogen bubbles evolve more vigorously at low potentials than at high potentials, which has led us to propose a mechanism for HER oscillation (J. Electroanal. Chem., 713, 39 (2014)). In order to obtain a deeper insight into the mechanism of HER oscillation, this present work studies the effect of high pressure (e.g. 0.7 MPa) on the oscillation and current-potential curves. It reveals that any N-shaped negative differential resistance characteristics are not involved in HER oscillation unlike the majority of electrochemical oscillations. It also shows that a solution-stirring effect due to the hydrogen bubble evolution, which causes an enhancement of convection near the electrode surface, plays an essential role in HER oscillation. We thus conclude that the appearance of HER oscillation can be explained by considering that the enhancement occurs only at low potentials at which hydrogen bubbles evolve vigorously.

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Current and potential oscillations during the electro-oxidation of bromide ions

Cited by 18 publications

References 32 publications

Selective Electrochemical Dibromination of Terpenes and Naturally Derived Olefins

Selective Electrochemical Dibromination of Terpenes and Naturally Derived Olefins

Energy Storage Technologies for Off-grid Houses

Mechanism of Potential Oscillation during Electrolysis of Water in Acidic Solutions

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