THE POTENTIAL DEPENDENCE OF CHANGES IN THE SURFACE OF FINELY DIVIDED PLATINUM AT A CARBON SUBSTRATE DURING HEATING IN CONCENTRATED PHOSPHORIC-ACID

Authors
GLADYSHEVA TD PODLOVCHENKO BI MAKSIMOV YM MOSKALEV VA
Citation
Td. Gladysheva et al., THE POTENTIAL DEPENDENCE OF CHANGES IN THE SURFACE OF FINELY DIVIDED PLATINUM AT A CARBON SUBSTRATE DURING HEATING IN CONCENTRATED PHOSPHORIC-ACID, Russian journal of electrochemistry, 33(7), 1997, pp. 681-685
Citations number
34
Categorie Soggetti
Electrochemistry
Journal title
Russian journal of electrochemistry → ACNP
ISSN journal
10231935
Volume
33
Issue
7
Year of publication
1997
Pages
681 - 685
Database
ISI
SICI code
1023-1935(1997)33:7<681:TPDOCI>2.0.ZU;2-Y
Abstract
Changes in the surface of finely divided platinum electrodeposited on a carbon substrate are studied under potentiostatic conditions in conc entrated phosphoric acid (duration of sintering 3 h) at 150 degrees C. The dependence of the sintering degree on E-r passes through a maximu m at about 0.3 V, which correlates with the potential dependence of th e reversible work required for formation of a unit surface area. The s intering rate is assumed to be determined by selfdiffusion of platinum atoms, migration of vacancies, and surface diffusion of crystallites.