Showing papers on "Cyclic voltammetry published in 1974"
TL;DR: In this article, the electrochemical behavior of RuO2 film electrodes, prepared by the thermal decomposition of Ru Cl3 on metallic supports, has been investigated in solutions of inert electrolytes.
Abstract: The electrochemical behaviour of RuO2 film electrodes, prepared by the thermal decomposition of Ru Cl3 on metallic supports has been investigated in solutions of inert electrolytes. Steady-state pot entiostatici/E curves, cyclic voltammetry and charging curves are presented. The procedure for the preparation of electrodes is described.
271 citations
TL;DR: In this paper, the early stages of metal deposition are controlled by a nucleation process, and the potentiostatic growth transients are in accord with a process of instantaneous nucleation and subsequent hemispherical growth, although the observed concentration dependence is at variance with that predicted by existing theories.
233 citations
TL;DR: In this paper, the role of sweep rate in kinetic analysis by convolution potential sweep voltammetry is underlined and a method is evaluated over 3.5 orders of magnitude sweep rate using the fluorenone-fluorenone anion couple in acetonitrile.
91 citations
TL;DR: In this paper, the electrochemical behavior of pure iron in alkaline sulphate solutions was studied using cyclic voltammetry atT = 298 K. At starting potentials in the range of hydrogen evolution and at maximum activation conditions, the voltammograms showed three anodic current maxima and two cathodic ones.
Abstract: The electrochemical behaviour of pure iron in alkaline sulphate solutions was studied using cyclic voltammetry atT = 298 K. It has been found that the results depend on the polarization pre-treatment of the electrode and the activation state of its surface. At starting potentials in the range of hydrogen evolution and at maximum activation conditions, the voltammograms show three anodic current maxima and two cathodic ones. A correlation between these different maxima is given. The electrode processes, which may take place at these maxima, are discussed in terms of possible iron dissolution mechanisms.
69 citations
49 citations
TL;DR: In this article, the formation of Ag2O and the pre-Ag2O oxidation stages by means of cyclic voltammetry, rotating disk and rotating ring disk electrode techniques are investigated.
49 citations
TL;DR: In this article, the reduction of N 2 O has been studied by cyclic voltammetry for a variety of solution conditions and the reduction process is blocked by the presence of NO, NO 2 −, PbO 2 − or I − in the sample solution.
42 citations
TL;DR: In this article, the identity of the 12-molybdosilicic acid was established polarographically and spectrophotometrically, and the range of stability of the beta-isomer as a function of hydrogen ion concentration was determined.
Abstract: The beta form of 12-molybdosilicic acid was prepared and isolated as a yellow hygroscopic solid from a 1:1 mixture of water-dioxane. The identity of the beta- isomer was established polarographically and spectrophotometrically. The range of stability of the beta-isomer as a function of hydrogen ion concentration was determined. In addition, techniques were developed for preparing, in pure form, several heteropoly compounds used for polarographic and conductivity measurements. The solvolytic stability, electrolyte strength and oxidation-reduction behaviour of several heteropoly compounds were determined by pH, conductivity, and polarographic measurements. Heteropolymolybdate oxidation—reduction behaviour and stability in solution were examined by direct current and alternating current polarography and cyclic voltammetry in aqueous and water-dioxane solutions. The reduction of the anions proceeds in several steps for which the half-wave potentials were determined. Conductivity and pH measurements on the heteropoly acids H4 [PMo11V040]and H5 [PMo10V2O40]at 25 °C in aqueous solution, and in mixed oxygen-containing solvents, show that the vanadium compounds exhibit behaviour typical of unsymmetrical strong electrolytes in oxygen-containing solvents and are stable in these media.
41 citations
TL;DR: In this article, the anodic behavior of iridium in 0.5 M H 2 SO 4 was investigated by cyclic voltammetry and ellipsometry and the results were interpreted by assuming a pit model for the oxidation process.
35 citations
TL;DR: In this paper, the electrochemical behavior of aqueous TcO4− solutions has been studied by cyclic voltammetry in the pH range −0.5 ÷ 14.
25 citations
TL;DR: In this paper, the rates of reaction of the radical ions of diethyl fumarate, ethyl cinnamate, stilbene and anthracene, with some organic halides, proton donors and olefins, were measured by cyclic voltammetry.
TL;DR: The electrochemical behavior of phenyl-substituted ehtylenes was studied in dimethyl-formamide (DMF) and hexamethylphosphoricacid-triamide (HMPA) by cyclic voltammetry as discussed by the authors.
TL;DR: In this article, cyclic voltammograms were used to show that the B12r+e→B12s electron transfer reaction at a mercury drop electrode is quasi-reversible with a ks=1.7±0.3 cm s−1 in 0.0667 M KH2PO4−Na2HPO4.
TL;DR: In this article, the lead electrode in 1 M aqueous hydrochloric acid was carried out by means of cyclic voltammetry, rotating disk electrode techniques, potentiostatic current-time transients.
TL;DR: In this article, the mechanism of electroreduction of benzoic acid on mercury and lead cathodes has been investigated using cyclic voltammetry and constant potential electrolysis, the main reaction pathway was found to be via electron transfer to an adsorbed ion-pair on "cation bridge", the presence of the cation stabilising the benzoate anion at the electrode surface.
TL;DR: In this article, the electrochemical oxidation of o - and m -toluidine has been investigated at platinum and carbon paste electrodes with periodical renewal of the diffusion layer and with the cyclic voltammetry in the pH range 0.7-12.5.
TL;DR: In this paper, the half-wave potentials of Co2+ tetraphenylporphyrin, measured by cyclic voltammetry in methylenechloride solution, are changed by the addition of weak bases like methanol, acetone and dimethylformamide.
Abstract: The oxidation half-wave potentials of Co2+ tetraphenylporphyrin, measured by cyclic voltammetry in methylenechloride solution, are changed by the addition of weak bases like methanol, acetone and dimethylformamide. The wave corresponding to the metal-oxidation Co2+ ⇄ Co3+ is shifted to lower potential, while the wave, corresponding to the ligand oxidation Co3+(TPP) ⇄ Co3+(TPP)+. is shifted to higher potential. It can be shown, that this is due to a preferential interaction of Co3+(TPP) with the bases, which is stronger than that of the Co2+(TPP) as well as that of the Co3+(TPP)+. Because the shifts are proportional to the concentration of added base, they can be followed quantitatively and the equilibrium constants of the interactions between the different oxidation states and the bases can be calculated. The reduction wave of Co2+(TPP), corresponding to the Co3+ ⇄ Co1+ transition is not changed by the weak bases, but is shifted to lower potential by pyridine and the picolines. The shift is again proportional to the concentration of added base. The reduction wave of Fe3−(TPP)Cl− is not changed by the weak bases, but is shifted to lower potential by pyridine. While the reduction wave of the free Fe3+(TPP)Cl− is irreversible, that of the pyridine-adduct is reversible. In this case the shift is not proportional to the amount of added base. The voltammetric curves of the Cu, Ni, and Zn tetraphenyl-porphyrins are not changed by the addition of either the weak or the strong bases.
TL;DR: In this article, the electrochemical oxidation of p -toluidine was investigated at platinum and carbon paste electrodes with periodic renewal of the diffusion layer, and with cyclic voltammetry in the pH range 0.7-12.5.
TL;DR: In this article, linear potential sweep voltammetry of vitamin K2 (VK2) has been examined in aqueous methanol media with hanging mercury drop electrode to elucidate the role of long hydrocarbon chains in the electrode processes.
TL;DR: Anodic oxidations of several 4- and 4-substituted benzanilides were investigated by cyclic voltammetry and controlled potential electrolysis at a glassy-carbon electrode in aqueous buffer solution and also in dry acetonitrile in the absence and presence of pyridines.
Abstract: Anodic oxidations of several 4- and 4′-substituted benzanilides were investigated by cyclic voltammetry and controlled potential electrolysis at a glassy-carbon electrode in aqueous buffer solution and also in dry acetonitrile in the absence and presence of pyridines. 4′-Methoxybenzanilide (MBA) showed two anodic peaks between pH 9·5 and 11·5, and a single anodic peak at higher and lower pH values. On electrolysis of MBA in weakly acidic or neutral solution, N-benzoyl-p-benzoquinone imine was formed, and on electrolysis in alkaline and strongly acidic solution, p-benzoquinone and benzamide were the main products. Anodic oxidation of MBA in acetonitrile containing excess of pyridine gave the pyridinated MBA, 1-(2-benzamido-5-methoxyphenyl)pyridinium perchlorate.
TL;DR: In this article, the reduction of phenylcyclooctatetraene, 1,3,5,7-tetraphenylcyclo-octatetrasene and 1,2,4,7,tetrameryl cyclo-cyclohexagonal hexahedral tetraene was studied in several nonaqueous solvents using d.c.p.r. polarography and cyclic voltammetry.
TL;DR: In this article, the pyrolytic graphite electrode is used to oxidize uric acid, xanthine and allopurinol to give bis-imine, which can be detected as a cathodic peak by fast-sweep cyclic voltammetry.
TL;DR: In this article, the formation of thiocyanate complexes of cadmium (II), copper, cobalt, and iron (II) has been studied in acetonitrile by polarographic, conductometric, and spectrophotometric methods.
Abstract: The formation of thiocyanate complexes of cadmium (II), copper(II), cobalt(II), and iron(II) has been studied in acetonitrile by polarographic, conductometric, and spectrophotometric methods The values of overall stability constants were found to be; logβ4=197 for [Cd(SCN)4]2−, logβ2=76 for [Cu(SCN)2]− and logβ4=155 for [Co(NCS)4]2− The reaction between copper(II) species and mercury metal was investigated and the electrode reaction was estimated Kinetic current for cobalt(II)-thiocyanate complex was observed and the rate constant for the dissociation of the complex was obtained The rate constant of reduction in the iron(II)-thiocyanate system was determined to be 19×10−3 cm/s by cyclic voltammetry
TL;DR: In this paper, the reduction of indanone (I), tetralone (II) and benzosuberone (III) was studied with a dropping mercury electrode in aqueous solutions containing 2% ethanol at various pH values.
TL;DR: In this paper, cyclic voltammetric, coulometric, and chronocoulometric data associated with the reduction of at mercury electrodes are reported that confirm previous results indicating the occurrence of a two-electron reduction to produce the hydrido complex, which engages in a pH dependent equilibrium involving.
Abstract: Cyclic voltammetric, coulometric, and chronocoulometric data associated with the reduction of at mercury electrodes are reported that confirm previous results indicating the occurrence of a two‐electron reduction to produce the hydrido complex, , which engages in a pH dependent equilibrium involving . The resulting presence of at the electrode surface has a number of interesting consequences which are described. Among these are the electrochemical production of metal‐metal bonded rhodium‐mercury adducts, apparent strong adsorption of on the electrode surface, and anomalous cyclic voltammograms with inverted peaks.
TL;DR: In this article, the thermal and electrochemical properties of graphite in the molten alkaline nitrate have been correlated and an electrochemical reaction involving O 2 − ion and NO has been shown to proceed via an oxide on the graphite electrode surface which can be electrochemically reduced.
TL;DR: In this paper, a 2-to-2 dimeric Mo-riboflavin anion radical complex has been investigated by cyclic voltammetry, controlled potential electrolysis, UV-visible spectrophotometry and E.S.R. spectroscopy.