F. Nagy

Investigation of adsorption phenomena on platinized platinum electrodes by tracer methods

Summary A method has been developed for the investigation of adsorption phenomena on platinum electrodes and Pt-powder by tracer techniques, using isotopes emitting soft β-radiation. The effect of the parameters of the apparatus on the practical application of the method has been analysed in detail, and the applicability of the method has been presented by an experimental test.

Investigation of adsorption phenomena on platinized platinum electrodes by tracer methods: II. The potential dependence of anion adsorption

Summary The potential dependence of Cl− and HSO4−-ion adsorption was investigated on platinized Pt electrodes in 1 M HClO4 supporting electrolyte solution by a tracer method. It has been established that there is a marked difference between experimental results obtained with freshly prepared electrodes and with electrodes previously used. In the case of freshly prepared or regenerated electrodes, characteristic sections can be distinguished in the potential dependence of adsorption in a wide concentration range. We have arrived at the conclusion that the dependence of adsorption on the concentration and electrode potential can be expressed as the product of two functions each of one variable (concentration or electrode potential).

Investigation of adsorption phenomena on platinized platinum electrodes by tracer methods: IV. Adsorption of aromatic compounds

Summary The adsorption of benzoic acid, benzenesulfonic acid, and phenylacetic acid, on platinum electrode, has been studied by tracer techniques The apparent dependence of adsorption on the electrode potential is considered as a secondary phenomenon The rate of desorption of all three compounds studied is very low. The removal, at measurable rates, of the molecules adsorbed on the surface can be effected only by some reaction.

Investigations of bismuth adsorption via the ionization of hydrogen adsorbed on platinized platinum in hydrochloric acid solutions

The formation of an adsorbed bismuth layer via the ionization of hydrogen adsorbed on platinized platinum in HCl media is described. Not only bulk bismuth but also adsorbed BiO can act as intermediates. The electrosorption valency (γ) of a potentiostatically-formed adsorbed bismuth layer is calculated to be 2.85.

Investigations of gold adsorption on platinized platinum in hydrochloric acid media

Abstract Au adsorption via the ionization of adsorbed hydrogen takes place in two steps. The first step is the formation of Aubulk, then the Auads is formed via the ionization of Aubulk. One adsorbed Au atom occupies 1.25 hydrogen adsorption sites, whilst at low coverages this value rises to 2.5. The Pt covered with Auads shows a catalytic effect on the oxidation of Cl− ions. The Auads does not desorb in Cl−-free media.

Investigation of lead adsorption via the ionization of hydrogen adsorbed on platinized platinum

Abstract In the case of lead adsorption via the ionization of hydrogen adsorbed on platinized platinum, adsorbed Pb+ ions are also formed on, and partly desorbed from, the surface. The site requirement of an adsorbed lead atom is S=2.3 and 1.9.

Investigations of copper adsorption in hydrochloric acid media, via the ionization of hydrogen adsorbed on platinized platinum

Abstract Copper deposition in hydrochloric acid media, via the ionization of hydrogen adsorbed on platinized platinum, results in an adsorbed metal layer similar to that formed potentiostatically. However, the adsorbed hydrogen is replaced by adsorbed copper only to a certain extent, owing to the formation of Cu + ions. This discrepancy depends on the chloride ion activity and the structure of the platinum black.

The effect of media on the adsorption of bismuth on platinum

Abstract It has been shown that the distortion of the charging curve of a Pt electrode after Bi adsorption in HClO 4 solution is caused by irreversible adsorbed Bi which desorbs in HCl. At low coverages, adsorbed Bi atoms occupy three former hydrogen adsorption sites. The electrosorption valency in HClO 4 of an adsorbed Bi layer formed in HCl is γ≈2.3. The existence of a BiCl surface radical is assumed.