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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Unusual reaction of gold on Hanging Mercury Drop Electrode
 Heyrovský, Michael ; Josypčuk, Bohdan ; Korshunov, A.
In linear voltammetry of dilute aqueous chloroauric acid with hanging mercury drop electrode. when scanning proceeds from negative to positive potentials, a prominent maximum of cathodic current appears on the curves near 0 V. This effect is explained by catalysis of hydrogen evolution by short-lived gold nanoparticles at the electrode surface.
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Voltametrie vysoce dispergovaných měděných prášků na rtuťových elektrodách
 Heyrovský, Michael ; Korshunov, A. ; Bakardjieva, Snejana
Average size of majority of the tested powder particles was between 100 and 300 nm, which are kept in relatively stable dispersed form in electrolytic solutions by Brownian motion. Electrolytic activity of the particles was due to 10-30 nm thick surface layer of copper oxides, the outer side consisting of CuO, the inner side of Cu.sub.2./sub.O. The current due to electroreduction of surface copper oxides followed particulate mechanism: on fortuitous contact of particle with electrode surface an immediate transfer of a number of electrons takes place, determined by time of the contact and by several dynamic and steric factors. No diffusion flux of particles to electrode surface is established. The potential of particulate electroreduction is determined by electronic structure of the actual form of the solid state particle.
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