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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, E30100 Murcia, Spain Univ Murcia Murcia Spain E30100 m, Dept Quim Fis, E30100 Murcia, Spain
 Titolo Testata:
 LANGMUIR
fascicolo: 18,
volume: 17,
anno: 2001,
pagine: 5520  5526
 SICI:
 07437463(20010904)17:18<5520:CRDCWE>2.0.ZU;2W
 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, E30100 Murcia, Spain UnivMurcia Murcia Spain E30100 im Fis, E30100 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. 55205526
Abstract
Theoretical expressions are presented corresponding to the response of adsorbed molecules which exhibit a quasireversible 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.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 22:38:22