Počet záznamů: 1

Extended viologen as a source of electric oscillations

  1. 1.
    0358314 - UFCH-W 2012 RIV GB eng J - Článek v odborném periodiku
    Pospíšil, Lubomír - Hromadová, Magdaléna - Fanelli, N. - Valášek, Michal - Kolivoška, Viliam - Gál, Miroslav
    Extended viologen as a source of electric oscillations.
    Physical Chemistry Chemical Physics. Roč. 13, č. 10 (2011), s. 4365-4371 ISSN 1463-9076
    Grant CEP: GA ČR GA203/09/0705; GA AV ČR IAA400400802; GA MŠk OC 140
    Výzkumný záměr: CEZ:AV0Z40400503; CEZ:AV0Z40550506
    Klíčová slova: electrochemical oscillators * electrochemistry * simple model
    Kód oboru RIV: CG - Elektrochemie
    Impakt faktor: 3.573, rok: 2011

    A long organic molecule 1 with five bipyridinium functions separated by benzene rings (extended viologen) undergoes a reversible multi-step electron transfer. Here we show that this decacation accepts electrons at the heterogeneous interface with the occurrence of the periodically changing electric reduction currents. According to the applied bias voltage the observed current-time dependence changes from chaotic through periodic and irregular to sinusoidal and finally to monotonous. A careful choice of the controlling parameters yields the sustained periodic sinusoidal currents lasting for a prolonged time. Oscillations stem from a mutual interplay of the heterogeneous supply of electrons and the homogeneous redox reactions (disproportionation) between the transient redox forms. In difference to many other electrochemical oscillating systems the described oscillations do not require any additional external impedance.
    Trvalý link: http://hdl.handle.net/11104/0196400