This experimental thesis deals with cooperative phenomena that occur during the electrodissolution of CO on Pt electrodes. Three aspects are considered. Using a self-designed electronic control device, evidence for the existence of a postulated chemical positive feedback loop in the reaction mechanism is obtained. Measurements at both, low concentration of supporting electrolyte and low CO bulk concentration yielded information about the competitive adsorption of CO, OH and anions. Thereby, conditions could be established that promoted CO oxidation at surprisingly low potentials. Further, the interaction of strongly adsorbing anions with the elementary steps of CO electrooxidation is shown to cause an oscillatory instability in wide parameter ranges. The oscillations are chemical in nature and present the first experimental example of a so-called strictly potentiostatic oscillator where the electrode potential acts as a parameter.     «

This experimental thesis deals with cooperative phenomena that occur during the electrodissolution of CO on Pt electrodes. Three aspects are considered. Using a self-designed electronic control device, evidence for the existence of a postulated chemical positive feedback loop in the reaction mechanism is obtained. Measurements at both, low concentration of supporting electrolyte and low CO bulk concentration yielded information about the competitive adsorption of CO, OH and anions. Thereby, cond...    »