Abstract
H 2 reactivity with steady-state formed Pt—O is far slower and more complex than H 2 reactivity with transient formed Pt—O ad. Under steady state, dermasorbed oxygen, adsorbed sulphate ions, and the uncertainty in the types and total quantities of associated oxygen make the relationship between the concentration of oxygen and time, or potential, too complex for direct kinetic evaluation. The early, diffusion-independent, open-circuit potential decay from steady state, however, can be described using a model of two capacitive discharges. One process is a double-layer capacitance discharge plus complex adsorption/desorption effects, while the second is the chemical removal of Pt—O by reaction with H 2.
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