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Titolo:
Cyclic reciprocal derivative chronopotentiometry with exponential time currents in the study of slow charge transfer processes between electrodes andredox adsorbates
Autore:
Gonzalez, J; Molina, A;
Indirizzi:
Univ Murcia, Fac Quim, Dept Quim Fis, E-30100 Murcia, Spain Univ Murcia Murcia Spain E-30100 m, Dept Quim Fis, E-30100 Murcia, Spain
Titolo Testata:
LANGMUIR
fascicolo: 18, volume: 17, anno: 2001,
pagine: 5520 - 5526
SICI:
0743-7463(20010904)17:18<5520:CRDCWE>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
POTENTIOMETRIC STRIPPING ANALYSIS; PROGRAMMED CURRENTS; VOLTAMMETRY; REDUCTION; MERCURY; ULTRAMICROELECTRODES; POLAROGRAPHY; FILMS; DNA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Molina, A Univ Murcia, Fac Quim, Dept Quim Fis, E-30100 Murcia, Spain UnivMurcia Murcia Spain E-30100 im Fis, E-30100 Murcia, Spain
Citazione:
J. Gonzalez e A. Molina, "Cyclic reciprocal derivative chronopotentiometry with exponential time currents in the study of slow charge transfer processes between electrodes andredox adsorbates", LANGMUIR, 17(18), 2001, pp. 5520-5526

Abstract

Theoretical expressions are presented corresponding to the response of adsorbed molecules which exhibit a quasi-reversible or totally irreversible charge transfer in cyclic reciprocal derivative chronopotentiometry with exponential currents (CRDEC). The higher and better defined peaks obtained in CRDCEC compared with those obtained in cyclic voltammetry (CV) indicate thatCRDEC could be considered as a powerful tool in the characterization of molecular films. Although reciprocal derivative chronopotentiometry with constant current (RDC) enjoys at present an extensive use in the elucidation ofelectrode processes, when this technique is applied to adsorbed molecules exhibiting an irreversible charge transfer, peaks are not observed. Under these conditions, RDCEC turns out to be more suitable than RDC. Furthermore,the use of programmed currents makes the selection of an appropriate rangeof transition times easier than does the use of constant currents. Equations for the peak currents, peak potentials, ratio between peak heights, and difference between peak potentials of successive responses corresponding totwo exponential currents of opposite signs have been applied to the determination of the kinetic parameters of the experimental system azobenzene in protic media.

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Documento generato il 01/12/20 alle ore 22:38:22