Open AccessThe Platinised Platinum Interface Under Cathodic Polarisation
Author(s) -
Jacques Simonet
Publication year - 2006
Publication title -
platinum metals review
Language(s) - English
Resource type - Journals
eISSN - 1471-0676
pISSN - 0032-1400
DOI - 10.1595/147106706x152703
Subject(s) - cathodic protection , platinum , materials science , interface (matter) , composite material , chemistry , electrochemistry , organic chemistry , electrode , capillary number , capillary action , catalysis
International audienceUnder the use of super-dry DMF contg. tetraalkylammonium salts (TAAX with X = Cl, Br, I, ClO4, BF4, etc.) platinized Pt layers may exhibit a reversible charging process that occurs at quite neg. potentials (more neg. than -2.2 V vs. SCE). The mode of reactivity of the electrolyte and the reversibility of the Pt charging of platinized layers (whatever the type of conducting substrate - Au and glassy C can also be used successfully) are discussed in terms of the nature of the salt. After cathodic charge and oxidn. by air of samples removed from the cell, a huge change of morphol. of the original platinized layer was obsd. During repeated redn./oxidn. stages, the original amorphous platinized layer was progressively transformed, with a noticeable swelling of the original layer. This transformation, based essentially on cathodic swelling due to the peculiar reactivity of Pt in the presence of bulky tetraalkylammonium salts, is the precondition for a new kind of Pt interface