| Full text | |
| Author(s): |
Total Authors: 3
|
| Affiliation: | [1] Univ Sao Paulo, Inst Chem Sao Carlos, Sao Paulo - Brazil
[2] Gwangju Inst Sci & Technol, Ertl Ctr Electrochem & Catalysis, Kwangju - South Korea
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | PLoS One; v. 7, n. 11 NOV 21 2012. |
| Web of Science Citations: | 13 |
| Abstract | |
In this study we address the problem of the response of a (electro)chemical oscillator towards chemical perturbations of different magnitudes. The chemical perturbation was achieved by addition of distinct amounts of trifluoromethanesulfonate (TFMSA), a rather stable and non-specifically adsorbing anion, and the system under investigation was the methanol electro-oxidation reaction under both stationary and oscillatory regimes. Increasing the anion concentration resulted in a decrease in the reaction rates of methanol oxidation and a general decrease in the parameter window where oscillations occurred. Furthermore, the addition of TFMSA was found to decrease the induction period and the total duration of oscillations. The mechanism underlying these observations was derived mathematically and revealed that inhibition in the methanol oxidation through blockage of active sites was found to further accelerate the intrinsic non-stationarity of the unperturbed system. Altogether, the presented results are among the few concerning the experimental assessment of the sensitiveness of an oscillator towards chemical perturbations. The universal nature of the complex chemical oscillator investigated here might be used for reference when studying the dynamics of other less accessible perturbed networks of (bio)chemical reactions. (AU) | |
| FAPESP's process: | 09/07629-6 - Electrocatalysis IV: fundamental and applied aspects of electrocatalytic processes, bio-electrocatalysis and kinetic instabilities |
| Grantee: | Edson Antonio Ticianelli |
| Support Opportunities: | Program for Research on Bioenergy (BIOEN) - Thematic Grants |