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Electrochemical behavior of copper metal core/oxide shell ultra-fine particles on mercury electrodes in aqueous dispersions
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SYSNO ASEP 0326227 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Electrochemical behavior of copper metal core/oxide shell ultra-fine particles on mercury electrodes in aqueous dispersions Title Elektrochemické chování ultra-malých měděných částic s oxidovou vrstvou na rtuťových elektrodách ve vodných disperzích Author(s) Korshunov, A. (RU)
Heyrovský, Michael (UFCH-W) RIDSource Title Journal of the Electroanalytical Chemistry and Journal of Electroanalytical Chemistry and Interfacial Electrochemistry. - : Elsevier - ISSN 0022-0728
Roč. 629, 1-2 (2009), s. 23-29Number of pages 7 s. Language eng - English Country CH - Switzerland Keywords ultrafine copper powders ; surface oxide layers ; aqueous dispersions ; voltammetry ; Hg electrodes Subject RIV CG - Electrochemistry R&D Projects GA203/07/1195 GA ČR - Czech Science Foundation (CSF) IAA400400806 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z40400503 - UFCH-W (2005-2011) UT WOS 000265468400003 DOI 10.1016/j.jelechem.2009.01.009 Annotation Methods of voltammetry and polarography have been applied to study electrochemical behavior of ultrafine copper particles with Z-average diameter similar to 120 nm in aqueous electrolytic media on mercury electrodes. Particles have been preliminarily stabilized by controllable passivation at low partial pressures of oxygen what resulted in formation of superficial oxide shell with certain composition and structure. It has been found that special electrochemical behavior of the particles in aqueous media is caused by the size effects as well as by the processes (partial dissolution, complexation) occurring at the "particle/solution" interface. Electroreduction of the dispersions takes place at about -0.8 V (Ag/AgCl/KCl sat.). The mechanism of electroreduction includes an adsorption stage due to electric charge which the particles bear in the electrolyte. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2010
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