Electrocatalytic oxidation of formic acid and methanol on Pt deposits on Au(111)

被引:64
作者
Kim, Jandee
Jung, Changhoon
Rhee, Choong K. [1 ]
Lim, Tae-Hoon
机构
[1] Chungnam Natl Univ, Dept Chem, Taejon 305764, South Korea
[2] Korea Inst Sci & Technol, Ctr Fuel Cell Res, Seoul 136791, South Korea
关键词
D O I
10.1021/la701377n
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
This work presents characteristics of Pt deposits on Au(111) obtained by the use of spontaneous deposition and investigated by electrochemical scanning tunneling microscopy (EC-STM). On such prepared and STM characterized Au(111)/Pt surfaces, we studied electrocatalytic oxidation of formic acid and methanol. We show that the first monatomic layer of Pt displays a (root 3 x root 3)R30 degrees surface structure, while the second layer is (1 x 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 layers thick. On the optimized Au(111)/Pt surface, formic acid oxidation rates are enhanced by a factor of 20 compared to those of pure Pt(111). The (root 3 x root 3)R30 degrees-Pt yields very low methanol oxidation rates, but the rates increase significantly with further Pt growth.
引用
收藏
页码:10831 / 10836
页数:6
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