Abstract
AbstractPreferentially (100)‐oriented nanostructured platinum films were modified by subsequent surface functionalization with iridium through pulsed electrodeposition. The Ir surface coverage was adjusted by varying the number of applied electrodeposition pulses, and was found to modify the reactivity towards NH3 oxidation. Deposition of minute amount of Ir atoms ([Ir]=6 at%) at the surface of preferentially (100)‐oriented Pt leads to a decrease in the NH3 oxidation onset potential (from −430 to −500 mV vs. Hg/HgO), an increase in the current density (at −0.30 V) from 0.55 to 0.67 mA cm−2, and an increase in the poisoning resistance over polarization at constant potential. This is attributed to the preferential adsorption of Ir atoms at Pt(100) step sites close to the Pt(100) terraces that are known to be the more active for the electro‐oxidation of NH3.
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