Abstract
Oscillatory behavior was uncovered during the electrochemical oxidation of methionine in a potassium chloride solution on a gold electrode. Linear sweep voltammograms illustrate that it is Au rather than Au oxide which facilitates the oxidation of methionine. The passivation of Au electrode surface due to its oxidation causes the development of a negative differential resistance in the system, which consequently leads to the emergence of oscillations in current. Under certain conditions more complicated reaction behavior in the form of bursting oscillations could be seen. Gold dissolution was found to occur during the oscillatory process, which led to coating of the platinum counter electrode by gold nanoparticles, as confirmed with elemental analysis studies and scanning electron microscopy measurements. The as-prepared gold nanoparticle modified electrode is able to differentiate dihydroxybenzene isomers in their electrochemical analysis, a great improvement over flat Au electrode.
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