Showing papers in "Electrochimica Acta in 1984"

TL;DR: In this paper, the proposed mechanisms for O2 reduction on various catalysts are discussed, taking into account the possible role of superoxide radicals, hydogen peroxide and adsorbed dioxygen.

TL;DR: In this paper, it is shown that the temperature of preparation affects the catalytic activity through the surface area and the chemical composition (non-stoichiometry), and the co-variation of these parameters is best followed in situ by voltammetric curves and point of zero charge measurements.

TL;DR: The water splitting effect observed during current flow through ion exchange membranes is studied by examining the effect of including different types of molecules, in the adjacent aqueous phase, on the flows of the hydrogen and hydroxyl ions as discussed by the authors.

TL;DR: A comprehensive survey of achievements in electrocatalysis for the hydrogen evolution reaction (h.e.r.) has been reviewed with the main emphasis on the composite d-metal catalysts.

TL;DR: The most active and stable hydrogen evolving cathode, based on a nickel and molybdenum combination, exhibited overvoltages of about 60 mV for over 11,000 h of continuous electrolysis in 30 w/o KOH at 500 mA cm −2 and 70°C as mentioned in this paper.

TL;DR: In this paper, a review of the literature on ion transfer at the interface of two immiscible electrolyte solutions is presented, with a focus on facilitated ion transfer and electron transfer across ITIES.

TL;DR: In this paper, the authors compared the electrode potentials of ferrocene/ferricenium ion and bis(biphenyl)chromium(O)/bis(biphippyl) chromium(I) ion for different solvents obtained by polarography and cyclic voltammetry.

TL;DR: The surface of a platinum electrode was anodically polarized at 3 V vs standard hydrogen electrode in 1 N H2SO4 at 300 K for 16 h so that a thick uniform oxidation layer was formed as discussed by the authors.

TL;DR: In this paper, the role of the electrode material, the effect of the structure of the organic compound, and the role in the composition of the electrolytic solution is investigated with the help of various organic compounds (formic acid, methanol, ethanol, ethylene-glycol, C-2 compounds derived from ethylene glycol, butanol isomers) using cyclic voltammetry at the macroscopic level and infrared spectroscopy (either FTIRS or EMIRS) at the microscopic level.

TL;DR: In this paper, it was shown that only a fraction of the dissolved gas is transformed into bubbles at the electrode, expressed as the efficiency of gas evolution, increases as the current density increases but is far smaller than unity in usual industrial current density values and remains different from unity in the whole range of nucleate gas evolution.

TL;DR: In this article, the nickel sulphide catalysts have been examined for their structure and composition using scanning electron microscopy (SEM) and microprobe analyses, and they have been attributed to oxidation reactions involving hydrogen; a strongly bonded hydrogen and a dissolved or weakly absorbed hydrogen.

TL;DR: In this paper, Tafel slopes and reaction orders for the electrodeposition of nickel from Watts type baths onto a vitreous carbon electrode have been determined by both steady state and transient methods.

TL;DR: In this article, a model based on bulk diffusion towards a partially active electrode surface was proposed to characterize the dc and ac polarization behavior of the Ag/Ag+ system theoretically and experimentally, and it was demonstrated that surface relaxation may give rise to an inductive part in the ac-impedance diagram.

TL;DR: In this article, the potential (Eh) diagrams for the Sn/H 2 O system at 298 K were derived, including mononuclear and polynuclear hydroxy species not considered in the original Pourbaix diagrams, and the effect of chloride on the Eh-pH diagrams and tin oxide solubilities was described.

TL;DR: Raney-Ni catalysts, which are operated in technical electrolysis plants for cathodic hydrogen evolution and which are applied to the electrode structure by different means, were tested with respect to their catalytic activity under industrial conditions in an undivided cell as discussed by the authors.

TL;DR: In this paper, a platinum electrode was grown in 1 N NaOH at 3 V vs Ag/AgCl reference electrode, and the surface layer was analysed by X-ray photoelectron spectroscopy.

TL;DR: In this paper, the authors studied the effect of deoxygenated solutions on high-purity aluminium electrodes in acetate solutions of pH 7-10 at 25°C and by Auger electron spectroscopic investigations of oxide films formed.

TL;DR: In this article, the redox properties of the ferrocene/ferricinium Fc/Fc + couple were studied in aqueous 0.1 M NaCl solution of SDS, N -cetyltrimethylammonium bromide (CTAB) and polyoxyethylene-23 lauryl ether (Brij 35).

TL;DR: In this paper, the anodic charges obtained for each of these phases have been used in the analysis of the cathodic transients, and the partial transient for α-nickel appears to obey the laws for three-dimensional growth and progressive nucleation.

TL;DR: In this article, the effects of underpotential lead and bismuth adsorbates on the cathodic reduction of O2 and H2O2 in perchloric acid solution obtained on rotating disc Au and Ag single crystal surfaces of (111), (100) and (110) crystallographic orientation are discussed.

TL;DR: In this paper, the photo-electrochemical reduction of CO 2 has been examined on a number of p-type semiconductors and the results showed that the effect of tetraalkylammonium salts as electrolyte may be connected with specific adsorption of the cation and its surmised positive influence on CO 2 reduction.

TL;DR: In this paper, a new basic bubble parameter, J, has been introduced, which accounts for the bubble behavior, and it has been found that J = a 1 i h 1 and J /( J 0 − J ) = a 2 v h 2 where J 0 = J at v = 0 ms −1 and a 1, a 2 h 1, and h 2 are empirical constants; some of these depend on nature of gas evolved.

TL;DR: In this article, the lifetime time (τ) of a titanium/chromic oxide (Ti/Cr2O3 + TiO2) composite electrode was measured galvanostatically, determined by dissolution of CrO3, present at the surface of the polarized electrode.

TL;DR: In this article, the conductivity and Li charge-discharge efficiency of propylene carbonate (PC) and methylene carbonate(EC) mixed electrolytes were compared with those in PC electrolytes.

TL;DR: The diffusion coefficient, D, of CuSO4 in aqueous solution was determined at 2981 K by chronopotentiometry and also with a rotating disc electrode using the mixed control Levich equation as mentioned in this paper.

TL;DR: In this paper, high-purity aluminium rods with 5 mm 2 cross-section were imbedded in epoxy resin and corroded from one end, and the depths of these artificial pits were 0-1 mm.

TL;DR: In this paper, the formaldehyde oxidation in sodium hydroxide solution has been studied on platinum and gold single crystal electrodes with the (111), (110), and (100) orientations.

TL;DR: In this article, the influence of chromium content and polarization potential on the surface composition of ferritic FeCrMo alloys with 11 wt.% Mo exposed to hydrochloric acid has been investigated by AES depth profile analysis in order to contribute to the resolution of apparently contradictory results in the literature.

TL;DR: In this paper, the reaction order in zincate was found to be +1.3± 0.8 in the anodic and −0.8 ± 0.2 in the cathodic direction.

TL;DR: In this article, the effect of organic anions present in solution on the UPD of lead onto (111) oriented silver surface has been investigated using linear sweep voltammetry, and it was established that organic compounds, such as acetate and citrate, shift the lead UPD phenomena towards the reversible potential of lead.