Showing papers in "Journal of Electroanalytical Chemistry in 1998"

TL;DR: In this paper, it was shown that an electrode with a double layer of CPE character can never be an ''ideally polarizable electrode'' and the conclusions can be qualitatively applied to all systems with an interface revealing CPE behaviour.

TL;DR: In this article, the electro-oxidation of carbon monoxide and methanol on platinum-ruthenium bulk alloys was investigated by cyclic voltammetry and in situ FTIR reflectance spectroscopy.

TL;DR: In this article, the authors construct a model of ac impedance response to blocked linear diffusion that has a sloped low frequency region in the impedance plot, which is equivalent to solving Fick's law with a boundary condition that allows us to set an arbitrary impedance response at low frequencies.

TL;DR: In situ X-ray absorption studies were done in 1M HClO 4, with and without 0.3 M MeOH, on several well-defined carbon-supported Pt electrocatalysts with particle sizes in the range of 25 to 90 A as discussed by the authors.

TL;DR: Results reflect the low overpotential at which NADH is oxidized and demonstrate a new approach to lowering voltage losses in biofuel cells due to activation overpotentials.

TL;DR: In this paper, a macrohomogeneous model for the cathode catalyst layer of a low temperature fuel cell, which includes the kinetics of oxygen reduction at the catalyst∣−electrolyte interface, proton transport through the polymer electrolyte network, and oxygen diffusion through hydrophobized voids, is considered.

TL;DR: In this article, a polyvinylidene fluoride-hexafluoropropylene copolymer (PVdF(HFP)) matrix was used to construct bipolar cells with open-circuit voltages of 3.77 and 7.86 V.

TL;DR: In this article, a 4-nitrophenyl modified glassy carbon electrode has been investigated in the absence and presence of electroactive species such as ferricyanide, ruthenium hexaamine and hydroquinone following its electrochemical reduction in aqueous acidic media.

TL;DR: In this article, the authors used programmed potential electrolysis coupled with chromatographic analysis of the products formed, the nature and the variation of their concentrations as a function of pH and time have been determined.

TL;DR: In this paper, Nafion® 117 membranes were equilibrated in 11 kinds of aqueous solutions of HCl and NaCl, with a mole fraction of hCl between 0 and 1, all having cCl−=0.03 kmol m−3.

TL;DR: In this paper, it is shown that there are specific dependences of the H 2 evolution kinetic parameters on the Pt surface lattice geometry which are related to upd H deposition kinetics and to the well-known surface specificity of H upd behaviour at Pt as seen in cyclic voltammetry.

TL;DR: In this paper, a semi-empirical model for the diffusion limited current distribution holding for narrow wall-jet electrodes was described, and the bimolecular rate constant for the reduction of H 2 O 2 on the specially deposited Prussian blue was found to be k cat = 3×10 3 M −1 s −1.

TL;DR: In this article, the reaction mechanism of the oxidation of nickel in alkaline solutions has been studied by cyclic voltammetry and scanning electron micrography, and it was shown that the formation of a layer of nickel hydroxide depends on the surface treatment of the nickel electrode.

TL;DR: In this article, it was shown that capacitance dispersion on solid electrodes is due to surface disorder rather than roughness, i.e. geometric irregularities much larger than those on the atomic scale.

TL;DR: The mixing characteristics of binary self-assembled monolayers composed of 1-hexadecanethiol (HDT) and 3-mercaptopropionic acid (MPA) on Au(111) have been studied by cyclic voltammetry and scanning tunneling microscopy as discussed by the authors.

TL;DR: In this paper, the porosity of polyaniline polymers is investigated and the capacitive current plateau in the cyclic voltammogram and the large series ac capacitance is shown to be related to continuous faradaic charge transfer at potentials beyond the first oxidation wave.

TL;DR: Positive potential step experiments showed that salicylate, naproxen and tosylate, but not nicoside, could be released from the membrane in a controllable way, and show that tailor made parts for iontophoretic devices can be manufactured.

TL;DR: In this paper, a cyclic voltammogram of iridium oxide films (AIROFs) was obtained in a basic aqueous medium, and it was shown that a total of two electrons/iridium are exchanged in each redox system as the charges involved in both systems are nearly the same.

TL;DR: In this article, a linear correlation between surface stress and interfacial charge was observed and it was shown that this representation is to be preferred to the usual voltstressogram, since the structure of the latter is dominated by the differential capacity.

TL;DR: In this paper, an electrochemical quartz crystal microbalance is employed for investigating the formation of inhibitory polyphenol layers on the surface of gold electrodes, and frequency-time profiles are indicative of the formation a thin insulating polymeric layer, that meets the rigid film requirement, and are in good agreement with the voltammetric response.

TL;DR: In this paper, the authors compared the catalytic performance of methanol oxidations on smooth or high area platinum, platinum|tin and platinum|ruthenium electrodes, and found that tin showed an enhancing effect only for a short period of time because of the dissolution of tin from the surface.

TL;DR: In this paper, the ability of carbon electrodes modified by films of [Ru(L)(CO)2]n (L is a bidentate nitrogen ligand) to act as selective electrocatalysts has been investigated in aqueous solution following the influence of several parameters (electrolyte, initial pH and nature of the ligand L).

TL;DR: In this article, the problem of numerical simulation of the current to a microdisc electrode is made difficult by the presence of a boundary singularity at the electrode edge, which causes large errors in the simulated concentration values, and consequently, the simulated flux at the electrodes.

TL;DR: In this article, the effects of electron acceptors, i.e., oxygen and Fe3+, on the rate of mineralisation of oxalate were determined, and significant increases in the short-circuit photocurrent densities were observed upon the addition of Oxalate to the anode compartment when oxygen was present only in the cathode compartment.

TL;DR: In this article, the synthesis of a 3,4-ethylenedioxythiophene monomer functionalized by a sulphonate group was reported and its electrochemical polymerization in water allows the generation of water-soluble oligomers.

TL;DR: Aqueous p-toluenesulfonic acid solution is used to electrosynthesize a polyaniline (PANi) film on mild steel.

TL;DR: In this article, the use of Bi-modified polycrystalline platinum electrodes for constant-potential amperometric detection of carbohydrates after anion-exchange chromatography was investigated.

TL;DR: In this paper, the authors reported high frequency dielectric measurements (0.045-30 GHz) on Nafion® 117 at various states of hydration, showing a strong dependence of the Dielectric constant of the membrane with water content.

TL;DR: In this paper, the half-wave potential of reversible ion transfers across the aqueous/organic interface facilitated by a neutral macrocyclic ligand is derived for complexation reactions of 1:1 to 1:4 ion-to-ligand stoichiometries.

TL;DR: In this paper, cyclic voltammetry is used to deposit films of hydrous iridium oxide onto glassy carbon electrodes from a basic solution of saturated iridium(III) oxide.