Mutual indirect probing of platinized platinum/tungstate nanostructural features

• DOI: 10.1007/s10008-004-0545-6
• Publication Date: 2004-08-13T13:36:38Z
• Authors: Elena V. Timofeeva; Marina I. Borzenko; Galina A. Tsirlina; Evgeny A. Astaf’ev; Oleg A. Petrii
• Keywords: 01 natural sciences; 0104 chemical sciences

The comparative study of isopolytungstates immobilized on smooth Pt and platinized Pt (Pt/Pt) provides a possibility to separate several specific effects on H- and O-upd at an external platinum surface and inside the pores of Pt/Pt. In the former case, a solid rechargeable product is formed (nonstoichiometric tungsten bronze), which an inherent porous structure allows solution penetration and does not prevent charging of the Pt/solution interface. Electrochemical responses of smooth Pt give more precise information on the film behaviour, when adsorption phenomena are clarified on the basis of data for Pt/Pt. Electrocatalytic tests (nitrate reduction) confirm unambiguously that the major part of the internal Pt/Pt surface area is modified by adsorbed polytungstate. This result gives, in its turn, new understanding of the size of Pt/Pt pores on the nanometre scale.