Showing papers by "Ch. Comninellis published in 1999"
TL;DR: In this article, the anodic oxidn. of H2SO4 to H2S2O8 was investigated on B-doped synthetic diamond electrodes obtained by hot filament chem. vapor deposition.
Abstract: The anodic oxidn. of H2SO4 to H2S2O8 was investigated on B-doped synthetic diamond electrodes obtained by hot filament chem. vapor deposition. High current efficiency for H2S2O8 formation can be achieved in concd. H2SO4 (7.5 mol dm-3) and using high current densities (200 mA cm-2). The main side reaction is oxygen evolution. [on SciFinder (R)]
200 citations
TL;DR: In this paper, synthetic boron-doped diamond (BDD) thin film electrodes were tested for the electrogeneration of silver(II) in nitric acid, and the kinetics of the silver(I)/silver (II) couple were studied by cyclic voltammetry.
Abstract: Synthetic boron-doped diamond (BDD) thin film electrodes were tested for the electrogeneration of silver(II). In nitric acid, the kinetics of the silver(I)/silver(II) couple were studied by cyclic voltammetry. The results demonstrate that silver(II) can be produced with high current efficiency by silver(I) oxidn. at BDD electrodes. At low concn. of nitric acid and high concn. of silver(I), AgO is formed on the electrode surface. [on SciFinder (R)]
44 citations
TL;DR: The B-doped diamond surface (BDD-IrO2 electrode) was shown to be a redox catalysts in both oxygen evolution and orgs. oxidn. as discussed by the authors.
Abstract: Deposition of small amts. of IrO2 clusters on the B-doped diamond (BDD) surface (BDD-IrO2 electrode) dramatically enhances both the O2 evolution reaction and the oxidn. of orgs. in the potential region of water decompn. The fact that BDD-IrO2 electrode behaves similarly to IrO2-DSA type electrodes suggests that the IrO2 clusters on the BDD surface act as redox catalysts in both oxygen evolution and orgs. oxidn. [on SciFinder (R)]
41 citations
TL;DR: In this paper, DSA type electrodes (IrOx/Ti) were prepd by induction heating technique which allows a rapid decompn. of the precursor under anaerobic conditions.
37 citations
TL;DR: In this paper, synthetic B-doped diamond thin film electrodes were tested for electroanal detection of 2-naphthol by cyclic voltammetry in aq. acidic soln.
Abstract: Synthetic B-doped diamond thin film electrodes were tested for electroanal. detection of 2-naphthol. This redox reaction was studied by cyclic voltammetry in aq. acidic soln. Well-resolved oxidn. waves were obsd. and the voltammetric peaks exhibited naphthol concn. dependence. Linear calibration curves were obtained after a simple electrochem. anodic pretreatment. [on SciFinder (R)]
28 citations
01 Jan 1999
TL;DR: In this paper, it was shown that only reactions involving simple electron transfer are active on diamond electrodes in the potential region of water stability, while for more complex reactions, diamond electrodes show no electrocatalytic activity in the potentially water stable region.
Abstract: The electrochem. oxidns. of some org. compds. have shown that only reactions involving simple electron transfer are active on diamond electrodes in the potential region of water stability. For more complex reactions, diamond electrodes show no electrocatalytic activity in the potential region of water stability. These complex reactions can take place on diamond electrodes only under conditions of simultaneous oxygen evolution. The reactivity of some alcs. and carboxylic acids has been studied on diamond electrodes and a simplified mechanism for the oxidn. of orgs. by electrogenerated OH radicals on diamond has been proposed. [on SciFinder (R)]
2 citations
TL;DR: In this paper, the authors show that the Fe(CN)63-/4- couple behaves in a quasi-reversible manner at the Ti/diamond electrode, due to the formation of an conductive TiC interlayer between the Ti substrate and the diamond coating.
Abstract: Boron doped diamond films were deposited on Ti substrates by CVD. Raman spectroscopy reveals small amts. of nondiamond carbon. According to SEM and XRD, the diamond films are polycryst. with preferential {112} crystallite orientation. Electrochem. measurements show that the Fe(CN)63-/4- couple behaves in a quasi-reversible manner at the Ti/diamond electrode. The main reason of the successful prepn. of the Ti/diamond electrode is the formation of an conductive TiC interlayer between the Ti substrate and the diamond coating. [on SciFinder (R)]