Abstract
The effect of Cl− on Pt dissolution under both potentiostatic and potential cycling conditions is reported, using a channel-flow multi-electrode (CFME) as an in situ detection method. To avoid the contamination of the entire CFME system by Cl−, a liquid-phase chloride ion gun is placed upstream of the double electrode. Under potentiostatic conditions, Cl− enhances Pt dissolution by forming PtCl42− at potentials below 1.0 V and PtCl62− above 1.2 V. Under potential cycling conditions, Cl− accelerates Pt dissolution above 1.2 V by the enhanced formation of both PtCl62− and PtCl42−. The cathodic dissolution of Pt2+ during PtO2 reduction is also increased in the presence of Cl−. A mechanism for the effect of Cl− on Pt dissolution is proposed.
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