Electrochemical properties of palladium adlayers on Pt(100) substrates

详细信息    查看全文

• 作者：??lvarez ; B. ; Bern?? ; A. ; Rodes ; A. ; Feliu ; J.M.
• 关键词：Palladium ; Platinum ; Carbon monoxide ; Electrochemical methods ; Adatoms ; Oxidation
• 刊名：Surface Science
• 出版年：2004
• 出版时间：December 1, 2004
• 年：2004
• 卷：573
• 期：1
• 页码：32-46
• 全文大小：462 K

文摘

The formation of submonolayers of palladium on well-defined Pt(100) electrodes is described. It has been found that the adsorption of NO at open circuit and its further reductive stripping enable the possibility to prepare Pt(100) electrodes fully covered by the first palladium layer, without contributions coming from palladium in the subsequent layers. This method enables a better characterization of the palladium islands formed in the submonolayer range. The CO displacement method points out that hydrogen and anion adsorption play a role in the charge transfer processes involved in the voltammetric profile. The analysis of the charge-potential curves is used to determine the values of the potentials of zero total charge (pztc) of the different adelectrodes. The pztc diminishes almost linearly with palladium coverage, this shift being related to increasing anion adsorption at low potentials. Adsorbed palladium does not electrocatalyze the oxidation of adsorbed CO.