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Titolo:
INVERTED CURRENT-TIME TRANSIENTS - A NEW METHOD FOR THE DETERMINATIONOF THE POTENTIAL OF MAXIMUM ADSORPTION IN CONDENSED LAYERS
Autore:
DONNER C; KIRSTE S; POHLMANN L; BAUMGARTEL H;
Indirizzi:
FREE UNIV BERLIN,INST PHYS & THEORET CHEM,TAKUSTR 3 D-14195 BERLIN GERMANY
Titolo Testata:
Langmuir
fascicolo: 24, volume: 14, anno: 1998,
pagine: 6999 - 7007
SICI:
0743-7463(1998)14:24<6999:ICT-AN>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
SINGLE-CRYSTAL ELECTRODES; MERCURY WATER INTERFACE; PHASE-TRANSITIONS; THYMINE; SURFACE; URIDINE; URACIL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
C. Donner et al., "INVERTED CURRENT-TIME TRANSIENTS - A NEW METHOD FOR THE DETERMINATIONOF THE POTENTIAL OF MAXIMUM ADSORPTION IN CONDENSED LAYERS", Langmuir, 14(24), 1998, pp. 6999-7007

Abstract

The role of the potential of zero charge (PZC) and of the potential of maximum adsorption E-m during the adsorption of neutral molecules atthe electrode surface is not yet well understood. The phase transition of the adsorbed molecules to a condensed state adds further complications. But under certain circumstances this process can be utilized toobtain additional information about the adsorbate system and the electrochemical double layer. On these grounds a new method for the determination of the potential of maximum adsorption in condensed layers is proposed. This method is based purely on a qualitative analysis of theshape of current-time transients, which change their sign at the potential of maximum adsorption and become inverted. From this datum and the corresponding capacity-potential curves of the adsorbate system andof the pure electrolyte one can construct the true charge-potential characteristics of the system and obtain the value of the PZC. This method was applied to the system thymine/mercury/0.1 M NaClO4. One resultis that in this system the potential of maximum adsorption is a function of the temperature, the pH-value, and the prepolarization potential. This latter result can only be explained in terms of a kinetic argumentation.

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Documento generato il 14/08/20 alle ore 08:22:47