Electrocatalytic Oxidation of Formic Acid and Methanol on Pt Deposits on Au(111)

详细信息    查看全文

• 作者：Jandee Kim ; Changhoon Jung ; Choong K. Rhee ; Tae-hoon Lim
• 刊名：Langmuir
• 出版年：2007
• 出版时间：October 9, 2007
• 年：2007
• 卷：23
• 期：21
• 页码：10831 - 10836
• 全文大小：495K
• 年卷期：v.23,no.21(October 9, 2007)
• ISSN：1520-5827

文摘

This work presents characteristics of Pt deposits on Au(111) obtained by the use of spontaneous deposition andinvestigated by electrochemical scanning tunneling microscopy (EC-STM). On such prepared and STM characterizedAu(111)/Pt surfaces, we studied electrocatalytic oxidation of formic acid and methanol. We show that the first monatomiclayer of Pt displays a (3 × 3)R30 surface structure, while the second layer is (1 × 1). After prolonged deposition,multilayer Pt deposits are formed selectively on Au(111) surface steps and are 1-20 nm wide and one to five layersthick. On the optimized Au(111)/Pt surface, formic acid oxidation rates are enhanced by a factor of 20 compared tothose of pure Pt(111). The (3 × 3)R30-Pt yields very low methanol oxidation rates, but the rates increasesignificantly with further Pt growth.