Passivating systems display potential or electric current oscillations in galvanostatic or potentiastic control, respectively. Their occurrence is related to the negative differential resisitivity observed on the potenial vs electric current dependence commonly called polarization curve. Our cellular automata based model reproduced such polarization curves for the stationary regime.Here we show that our simulations reproduce either potential or electric current oscillations in galvanostatic or potentiastic conditions respectively. Compared to other modelling approaches we can see morphology variations during several oscillations periods.
Audience Take Away:
- CA automata based approach is a nice method of choice for complicated system modeling. In particular it correctly reproduces the qualitative features of passivating systems now including the oscillatory behavior.
- It can be used for a range of problems such as surface mask at nanoscale, inflence of aggressive ions on the passive layer structure, depassivation healing etc. It can have potential applications in surface nanosttructuring for subsequent enzyme or another catalyst deposition.