In situ EXAFS investigation of carbon-supported Pt clusters under potential control

被引：15

作者：

Hwang, BJ ^{[1
]}

Tsai, YW

Lee, JF

Borthen, P

Strehblow, HH

机构：

[1] NTUST, Dept Chem Engn, Taipei, Taiwan

[2] Synchrotron Radiat Res Ctr, Hsinchu, Taiwan

[3] Univ Dusseldorf, Inst Phys Chem & Electrochem, D-4000 Dusseldorf, Germany

来源：

JOURNAL OF SYNCHROTRON RADIATION | 2001年 / 8卷 / 02期

关键词：

X-ray absorption; transformation; Pt cluster; crystallization;

D O I：

10.1107/S0909049500019671

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The transformation of carbon supported Pt clusters under potential control in 1M HClO4 solution was investigated by in-situ X-ray absorption spectroscopy measurements. Both XANES and EXAFS data are used to show the structure evolution of the Pt clusters at various potentials. It showed that the white line area and the edge energy increase with the applied potential in the range 0.1 similar to 1.5V. The coordination number of oxygen and platinum on the Pt/C electrode increases and decreases, respectively, with the applied potential. It is found that the size of Pt cluster does not grow during the electrode fabrication. However, the crystallization of Pt cluster occurs during the potential cycling.

引用

页码：484 / 486

页数：3

共 2 条

[1] In situ observation of the potential-dependent chemical state and structure of a Cu monolayer deposited on the surface of carbon-supported platinum clusters
Borthen, P
Hwang, BJ
Strehblow, HH
Kolb, DM
[J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2000, 104 (21): : 5078 - 5083
[2] INSITU STUDIES OF A DISPERSED PLATINUM ON CARBON ELECTRODE USING X-RAY ABSORPTION-SPECTROSCOPY
HERRON, ME
DOYLE, SE
PIZZINI, S
ROBERTS, KJ
ROBINSON, J
HARDS, G
WALSH, FC
[J]. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1992, 324 (1-2): : 243 - 258

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