Abstract
Pd 0.2Fe 0.8, Pd 0.2Co 0.8 and Pd 0.2Ni 0.8 alloys were subjected to electrolysis in H 2SO 4 for production of nanoporous Pd. Surface analyses with different surface sensitivities revealed that Fe and Ni at the surface layer dissolve in H 2SO 4 after the electrolysis of Pd 0.2Fe 0.8 and Pd 0.2Ni 0.8, respectively, but this dissolution is confined to the surface layer. On the other hand, aggregation of Pd adatoms at the solid/electrolyte interface allowed exposure of internal Co atoms to the electrolyte, and as a result, nanoporosity formed only from Pd 0.2Co 0.8 alloys. These results experimentally suggest that the aggregation of remnant element (Pd in this case) at solid/electrolyte interface is necessary for the formation of nanoporosity by dealloying.
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