The electrocatalytic oxidation of formaldehyde on Pt(111) under potentiostatic conditions and periodic potential oscillations was studied by using optical second harmonic generation (SHG). Under potentiostatic conditions, order−disorder and order−order phase transitions were observed. Under galvanostatic conditions, oscillations of the SHG field occurred, corresponding to the potential oscillations. However, in the dynamic regime only the evidence of a structural order−disorder phase transition is present in SHG data. This might be due to a much higher time constant of the surface ordering in comparison to the oscillation period.
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Мишина et al. (2002) studied this question.
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