Dynamic Complexity in the Electrochemical Oxidation of Thiourea | Zendy

Jiamin Feng | Zendy; Qingyu Gao | Zendy; Xiaoli Lv | Zendy; Irving R. Epstein | Zendy

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Dynamic Complexity in the Electrochemical Oxidation of Thiourea

Author(s) -

Jiamin Feng,

Qingyu Gao,

Xiaoli Lv,

Irving R. Epstein

Publication year - 2008

Publication title -

the journal of physical chemistry a

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.756

H-Index - 235

eISSN - 1520-5215

pISSN - 1089-5639

DOI - 10.1021/jp802002k

Subject(s) - thiourea , electrolysis , cyclic voltammetry , electrochemistry , quasiperiodic function , amplitude , desorption , chloride , chemical physics , analytical chemistry (journal) , chemistry , electrode , adsorption , materials science , inorganic chemistry , condensed matter physics , physics , environmental chemistry , organic chemistry , optics , electrolyte

We explored the temperature-dependent dynamics of the electrochemical oxidation of thiourea under potential-control mode and found complex oscillations with one large peak and one small peak per period. Adjusting the temperature caused the relative amplitudes and positions of the two peaks to vary. Experiments showed that there were two distinct oscillatory regimes as a function of the external current, and at some temperatures, three-frequency quasiperiodic oscillations occurred for current densities between the two oscillatory windows. We examined the species present and the component reactions by employing cyclic voltammetry and electrolysis-HPLC-MS in the two oscillatory regimes. Adsorption and desorption of multiple species, including water and chloride, contribute to the rich dynamical phenomena that were observed.

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