Showing papers in "Journal of Electroanalytical Chemistry in 2003"

TL;DR: In this article, a comparative study was performed to determine the reactivity of nitrate ions at 0.1 M on eight polycrystalline electrodes (platinum, palladium, rhodium, ruthenium, iridium, copper, silver and gold) in acidic solution using cyclic voltammetry (CV), chronoamperometry and differential electrochemical mass spectroscopy (DEMS).

TL;DR: In this article, gold nanoparticles immobilized on an amine-terminated self-assembled monolayer (SAM) on a polycrystalline Au electrode were successfully used for the selective determination of dopamine (DA) in the presence of ascorbate (AA).

TL;DR: In this article, the effects of surface segregation on the oxygen reduction reaction (ORR) have been studied on a polycrystalline Pt3Ni alloy in acid electrolyte using ultra high vacuum (UHV) surface sensitive probes and the rotating ring disk electrode (RRDE) method.

TL;DR: Based on the experimental determination of the reaction orders of OH−, O2 and the intermediate Mn3+ ion, this paper proposed a chemical oxidation mechanism for the catalytic oxygen reduction, in which oxygen reduction proceeds through chemical oxidation of the discharge product of MnO2 rather than through a direct two-electron reduction.

TL;DR: A review of the area of electrodeposition of materials via a mechanism of nucleation followed by diffusion controlled growth is given in this article, where a short historical background to the study of nucleations via potentiostatic current transient modelling is provided, followed by an outline of the major methods currently used, with some comments on their relative merits.

TL;DR: In this article, the authors used ac impedance spectroscopy to analyze capacitors made of activated carbon fabrics containing different compositions of surface oxides and found that a thermal treatment temperature of 450°C gave the highest capacitance, indicating the low resistance in the carbon micropores as well as domination of the double layer mechanism in energy storage.

TL;DR: In this article, the effect of AQ surface concentration on the kinetics of oxygen reduction has been investigated and the rate constant of the chemical reaction between semiquinone radical anion of AQ and molecular oxygen has been determined.

TL;DR: In this article, the electro-oxidation of methanol was carried out on a platinised electrode in various alkaline media to examine the role of OH ads species and the influence of anions in the electrolyte on the methanoline oxidation reaction.

TL;DR: In this article, a modified electrode was constructed by intercalating carbon nanotubes (CNT) on graphite surface, which exhibits an attractive ability to determine dopamine (DA) and serotonin (5-HT) simultaneously in the presence of ascorbic acid (AA), resulting in a high DPV current response to 5-HT at 0.32 V and a favorably low response to AA at −0.07 V versus SCE in a 50 mM phosphate buffer.

TL;DR: In this paper, a self-assembled monolayer of a hetero-aromatic thiol, mercaptobenzimidazole (MBI), was used for the determination of uric acid (UA) in the presence of ascorbic acid.

TL;DR: In this article, the electrochemical properties of epinephrine, dopamine, and norepinephrine in aqueous solutions with various pH values have been investigated, and they exhibited different cyclic voltammograms.

TL;DR: In this article, the formation of phenyl layers by electrochemical reduction of aryl diazonium salts (N2/Ph/R with R/Br and CH2Br) on atomically flat H-terminated Si(111) electrodes was studied.

TL;DR: In this paper, the mesoporous Pt-Ru alloy has been successively prepared by the chemical coreduction of hexachloroplatinic acid and ruthenium trichloride both dissolved in aqueous domains of the liquid crystalline phases of an oligoethylene oxide surfactant using Zn metal reductant.

TL;DR: In this article, it was shown that the integral flux conservation property of the exact equations will be preserved by discretised ones, and that when executing simulations on an exponentially expanding grid, the computed flux becomes virtually independent of grid expansion.

TL;DR: In this paper, the influence of the structure of bimetallic platinum ruthenium electrocatalysts towards the electrooxidation of methanol has been investigated by cyclic voltammetry and coupled electrochemical measurements.

TL;DR: In this paper, the photoelectro-fenton reaction was applied to 2,4,5-trichlorophenoxyacetic acid (2,4-5-T) in an undivided cell with a Pt anode and an O 2 -diffusion cathode under UV irradiation, and its great oxidative ability is due to the fast reaction of organics with the high concentration of oxidizing hydroxyl radicals produced in the medium from Fenton's reaction between added Fe 2+ and H 2 O 2 electrogenerated by the cathode

TL;DR: In this article, a novel renewable tyrosinase-based biosensor was developed for the detection of phenol by immobilizing tyrosinsase on a colloidal gold modified carbon paste electrode.

TL;DR: In this article, the electron transfer at the bilayer is mainly governed by diffusion of the mediator through pinholes with electron transfer occurring at the free sites on the electrode rather than permeation.

TL;DR: In this article, it was shown that bis(3-sulfopropyl) disulfide (SPS) additive increases the current at the simulated via bottom cathode with an increase in SPS concentration.

TL;DR: In this paper, the E-pO2-graph of rare earth oxides and oxohalides has been compared to that of several chlorinating gaseous mixtures.

TL;DR: In this article, the adsorption energies of atomic hydrogen and of CO were determined as a microscopic probe of the reactivity of thin pseudomorphic Pd overlayers on Au(111) and (100) single crystal surfaces.

TL;DR: A detailed electrochemical characterisation of platinum-palladium nanoparticles prepared by reduction with hydrazine of H 2 PtCl 6 and K 2 PdCl 4 in a water-in-oil microemulsion of water/polyethylenglycol-dodecylether (BRIJ ® 30)/ n -heptane is reported in this paper.

TL;DR: In this paper, the authors investigated the electrochemical oxidation of five room temperature ionic liquids: 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([CnMIM][N(Tf)2], n=2, 4, 8, 10) and n-hexyltriethylammonium bis (triffluoromethsulfonyll)imides ([N6222]

TL;DR: In this paper, the electrochemical impedance spectroscopy of a platinum-modified polyaniline film formed by cycling potential or constant potential deposition of platinum particles in polyanile film is studied in sulfuric acid solution.

TL;DR: In this paper, the electrical double layer (edl) formation in nanostructured carbon aerogel was studied at various electrolyte solution concentrations (0.001-0.1 M) and scan rates (1 to 5 mV s −1 ) and the results showed that carbon aeroglobal polysilicon is a good edl capacitor and can be further divided into mesoporous and microporous capacitors.

TL;DR: In this paper, a CoPCNF-modified glassy carbon electrode was studied by cyclic voltammetry; the modified electrode shows one pair of peaks with a surface-confined characteristic in 0.5 M KNO3 as supporting electrolyte.

TL;DR: In this paper, an increase of the adsorbed methanolic residue stripping charge is observed with the increase of catalyst dispersion, and the stripping peak potential shifts more negatively accounting for a lower activation barrier for the reaction.

TL;DR: In this paper, an effective method for the determination of methanol permeability through simple electrochemical methods has been reported, which has been applied to find the permeability factors for various methanols concentrations.

TL;DR: In this article, stable films of myoglobin (Mb) or horseradish peroxidase (HRP) were assembled layer-by-layer with clay nanoparticles on various solid substrates by alternate adsorption of negatively charged clay platelets from their aqueous dispersions and positively charged heme proteins from their buffers at the appropriate pH.

TL;DR: In this paper, graphite has been characterised by electrochemical impedance spectroscopy (EIS) using a three electrode coin cell and the initial lithiation shows that lithium insertion can be modelled using the Langmuir insertion isotherm as well as the Frumkin insertion is otherm for very low insertion levels.