Chronoamperometrische untersuchung von bleiniederschlägen auf goldelektroden

摘要: Abstract The reduction of lead from aqueous solutions on the surface gold electrodes is studied chronoamperometrically using a thin-layer technique employing chamber type cell. current balance deposition or dissolution electrode verified by coulometrical evaluation chronoamperograms. In binary system Pb-Au there exist at room temperature two intermediate phases, namely Au2Pb and AuPb2. deposited forms first metallic monolayer, defined as layer electrically neutral atoms electrode-electrolyte interface, deposit having appropriate thickness one atomic diameter lead. activity isotherm lead, aPb, depends upon coverage within mono-layer region. existence unsaturated (submonoatomic) leads to splitting cathodic transient into so-called pre-wave region, which metal less than unity, main peak with unit electrodeposited depolarizer. formation Au-Pb alloys only happens when reaches activity. alloying cathodically in gives rise during anodic stripping new peaks layers, besides maxima prewave As opposed peaks, shape current-integral values these are found be functions various experimental parameters, for instance time interval between deposit.