Showing papers on "Cyclic voltammetry published in 1969"

Electrochemical Oxidation of Aliphatic Sulfides under Nonaqueous Conditions

Abstract: The anodic oxidation of aliphatic sulfides has been investigated, using cyclic voltammetry and controlled potential electrolysis. Reactions of dimethyl sulfide in acetonitrile have been studied in detail, considering the effects of variation of water content and of type of supporting electrolyte. With as much as 1% water in , dimethyl sulfide is completely oxidized to dimethyl sulfone. In anhydrous , the products are and . It is suggested that the electrochemical reaction involves formation of protons and , which condenses with to form . When perchlorate is present as supporting electrolyte, it is involved in a slow chemical reaction which produces Cl−, , and . The reaction of benzyl methyl sulfide is very similar, leading to benzaldehyde and .

The hydroquinone–quinone redox behaviour in acetonitrile

Abstract: Cyclic voltammetry reveals the occurence of five different electrode processes during the cyclic oxidation–reduction of the hydroquinone–quinone system in acetonitrile.

Cyclic Voltammetry of Mixed Metal Electrodes

Abstract: Repetitive potentiostatic triangular voltage sweeps cause a significant change in the surface structure and catalytic activity of mixed metal fuel cell electrodes. For the particular case of a platinum‐rhodium black electrode, each successive cycle causes a decrease in the platinum oxidation and reduction peaks with a proportionate increase in the rhodium oxidation and reduction peaks. The complete elimination of the platinum peaks is related to the resistance of an electrode to CO poisoning. A possible mechanism of the above behavior along with data on other mixed metal electrodes is presented.

A tripositive organic ion: anodic pyridination of tris-p-methoxyphenylethylene

Abstract: Anodic oxidation of tris-(p-methoxyphenyl)-ethylene in the presence of pyridine results in the intermediate formation of the monopyridinium salt of a trication, which undergoes quasi-reversible reduction under cyclic voltammetry conditions.

Electrochemical Characterization of Mass Transport at Microelectrode Arrays

Abstract: Electrodes with dimensions in the micro- and nano-meter scale can be used as analytical probes in confi ned places such as cells and organelles. Arrays of microelectrodes, particularly disk-shaped electrodes, are now a platform to fabricate electrochemical sensors and multisensors. A useful characteristic of such arrays is that enhancement of the current signal is due to the fact that radial diffusion becomes important as the disk radius gets smaller and steady state currents are attainable in a relatively short time. Because there is no general analytical solution for the current response at MEAs, previous characterization of any micro electrode array at hand is still required. This paper discusses the electrochemical characterization of the mass transport of a reversible electrochemical probe at a commercially available micro-disk electrode array by two commonly used tools for electro analysis, namely: cyclic voltammetry and chronoamperometry. The questions to be addressed are whether clear radial diffusion control can be effectively achieved and the time required for the electrode system to reach steady state. For chronoamperometric experiments, the current response almost achieves steady state in the time range between 0.49 s and 1 s. This is precisely the time bracket in which analytical measurements should be made in order to achieve high sensitivity.