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Electrochemical Activation (electrochemical + activation)

Distribution by Scientific Domains
Chemistry75%

Selected Abstracts

ChemInform Abstract: Electrochemical Activation of Carbon Dioxide in Ionic Liquid: Synthesis of Cyclic Carbonates at Mild Reaction Conditions.

CHEMINFORM, Issue 20 2002
Hongzhou Yang
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Renewable Ceramic (TiN) Ring Electrode in Stripping Voltammetry.

ELECTROANALYSIS, Issue 16 2009
Determination of Pb(II) Without Removal of Oxygen
Abstract Characteristic features of the process of Pb(II) reduction and oxidation at a renewable ceramic ring electrode (RCRE) were studied by stripping voltammetry. The main constituents of the RCRE are: a specially constructed TiN ring electrode, a silver sheet used as silver counter/quasi-reference electrode and a silicon O-ring are fastened together in a polypropylene body. The renovation of this electrode is carried out through mechanical removal of solid contaminants and electrochemical activation in the electrolyte which fills the RCRE body. The optimal measurement conditions, composition of supporting electrolyte and procedures of the electrode activation were selected. The measurements were carried out from nondeaerated solutions. As shown on selected examples, RCRE exhibits good performance in underpotential deposition stripping voltammetry (UPD-SV) applied for the determination of lead(II) in synthetic solutions with and without surfactants and in certified reference materials. The peak current is proportional to the concentration of lead(II) over the range 2×10,9,1×10,7,mol L,1, with a 3, detection limit of 1×10,9,mol L,1 with an accumulation time of 30,s. The obtained results showed good reproducibility, (RSD=2,5%; n=5) and reliability. [source]

Amperometric Glucose Biosensors Based on Glassy Carbon and SWCNT-Modified Glassy Carbon Electrodes

ELECTROANALYSIS, Issue 1 2008
Irene Carpani
Abstract Different carbonaceous materials, such as single-walled carbon nanotubes (SWCNTs) and glassy carbon submitted to an electrochemical activation at +1.80,V (vs. SCE) for 900,s, have been used with the aim of comparing their performances in the development of enzyme electrodes. Commercial SWCNTs have been pretreated with 2.2,M HNO3 for 20,h prior to use. The utility of activated GC as promising material for amperometric oxidase-based biosensors has been confirmed. With glucose oxidase (GOx) as a model enzyme, glucose was efficiently detected up to 1 mM without the use of a mediator. Both electrodes operated in stirred solutions of 0.1,M phosphate buffer (pH,5.5), containing dissolved oxygen, at a potential of ,0.40,V vs. SCE. Although the performances of the two carbonaceous materials were comparable, the biosensors based on activated GC were characterized by a practically unchanged response 40 days after the fabrication, a better signal to noise ratio, and a little worse sensitivity. In addition, the preparation procedure of such biosensors was more simple, rapid and reproducible. [source]

A comparative electrochemical study of commercial and model aluminium alloy (AA5050)

MATERIALS AND CORROSION/WERKSTOFFE UND KORROSION, Issue 6 2009
P. Premendra
Abstract A comparative electrochemical study of commercially recycled AA5050 and model AA5050, in their as-cast state, is carried out to investigate the effect of recycling and furthermore the effect of trace elements like Pb, Cu, etc on electrochemical activation and filiform corrosion (FFC) susceptibility. A systematic combination of surface analytical techniques like scanning Kelvin probe force microscopy (SKPFM), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) is used to study the composition and electrochemical behaviour of second phase particles. These results, together with localized breakdown measurements using the electrochemical micro-cell, elucidate the effect of recycling and the role played by trace elements in influencing the electrochemical behaviour of the alloy. [source]