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Coupled slow and fast surface dynamics in an electrocatalytic oscillator: model and simulations
Melke A Nascimento1, Raphael Nagao1, Markus Eiswirth2
1Institute of Chemistry of São Carlos, University of São Paulo, PO Box 780, 13560-970, São Carlos, SP, Brazil.
The Journal of Chemical Physics
|December 22, 2014
Summary
Slow surface changes significantly impact electrocatalytic oscillators, suppressing chaotic behavior and altering dynamics. This study numerically investigates these coupled dynamics, revealing how catalyst deactivation affects system evolution.
Area of Science:
- Surface Science
- Chemical Kinetics
- Nonlinear Dynamics
Background:
- Disparate time scales influence system evolution, particularly in surface reactions.
- Slow surface changes, like deactivation, critically affect core oscillator long-term behavior.
Purpose of the Study:
- To numerically investigate coupled slow and fast surface dynamics in an electrocatalytic oscillator.
- To analyze the impact of irreversible surface poisoning on system dynamics and oscillatory behavior.
Main Methods:
- Modeling electrocatalytic oscillator dynamics with four nonlinear coupled ordinary differential equations.
- Utilizing bifurcation analysis, high-resolution period diagrams, and Lyapunov diagrams.
- Exploring a wide parameter range to understand system responses.
Main Results:
- Irreversible surface poisoning considerably alters the bifurcation diagram, shrinking the oscillatory region.
- Chaotic oscillations are dramatically suppressed due to evolving surface poisoning.
- Periodic cascades persist within a specific region of the resistance vs. voltage diagram.
Conclusions:
- The study provides a comprehensive description of time-evolution in electrocatalytic oscillators under surface deactivation.
- Numerical findings offer reinterpretations of previous experimental results.
- Suggests further experiments to link catalyst structure evolution with system dynamics changes.
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