The effect of thermal pretreatment on the electrochemical response for palladium in aqueous media |
| |
Authors: | Declan L Burke Lisa M Hurley |
| |
Institution: | (1) Chemistry Department, University College Cork, Cork, Ireland, |
| |
Abstract: | Previous work on the electrochemistry of palladium in aqueous acid solution demonstrated the existence of two multilayer
hydrous oxide reduction peaks, one at ca. 0.24 V and another at ca. 0.55 V vs. RHE, plus the presence of a reversible active
surface state transition at ca. 0.24 V. In the present work with thermally activated palladium it was observed that, in agreement
with the hydrous oxide reduction behaviour of the system, there is a second active state transition at E≥ca. 0.45 V. In most of its reactions in aqueous acid solution, apart from its unusual capacity to absorb hydrogen, palladium
exhibits properties very similar to those of platinum; however, palladium seems to be more prone to dissolution and subsurface
oxygen formation. Also the premonolayer oxidation responses of these two metals are often different as the more active state
of the palladium surface is not as readily generated as that of platinum. The electrocatalytic properties of palladium, as
reported earlier, correlate quite well with the hydrous oxide and premonolayer oxidation behaviour of this electrode system.
Electronic Publication |
| |
Keywords: | Palladium Thermal activation Active surface states Premonolayer oxidation Electrocatalysis |
本文献已被 SpringerLink 等数据库收录! |
|