Nucleation and growth mechanism of Pd/Pt bimetallic clusters in sodium bis(2-ethylhexyl)sulfosuceinate (AOT) reverse micelles as studied by in situ X-ray absorption spectroscopy

被引：37

作者：

Chen, CH ^{[1
]}

Hwang, BJ ^{[1
]}

Wang, GR ^{[1
]}

Sarma, LS ^{[1
]}

Tang, MT ^{[1
]}

Liu, DG ^{[1
]}

Lee, JF ^{[1
]}

机构：

[1] Natl Taiwan Univ Sci & Technol, Nanoelectrochem Lab, Dept Chem Engn, Taipei 106, Taiwan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2005年 / 109卷 / 46期

关键词：

D O I：

10.1021/jp054062t

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report in situ X-ray absorption spectroscopy (XAS) investigations on the formation of palladium -platinum (Pd/Pt) bimetallic clusters at the early stage within the water-in-oil microemulsion system of water/AOT/n-heptane. The reduction of palladium and platinum ions and the formation of corresponding clusters are monitored as a function of dosage of reducing agent, hydrazine (N2H5OH). Upon successive addition of the reducing agent, hydrazine (N2H5OH), five distinguishable steps are observed in the formation process of Pd/Pt clusters at the early stage. Both in situ X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) analysis for both the Pd K-edge and Pt L-III-edge revealed the formation of Pd/Pt bimetallic clusters. A corresponding structural model is proposed for each step to provide a detailed insight into the nucleation and growth mechanism of Pd/Pt bimetallic clusters. We also discussed the atomic distribution of Pd and Pt atoms in Pd/Pt bimetallic clusters based on the calculated XAS structural parameters.

引用

页码：21566 / 21575

页数：10

共 46 条

[31] OIL-IN-WATER MICELLAR SOLUTION USED TO SYNTHESIZE CDS PARTICLES - STRUCTURAL STUDY AND PHOTOELECTRON TRANSFER-REACTION
PETIT, C
JAIN, TK
BILLOUDET, F
PILENI, MP
[J]. LANGMUIR, 1994, 10 (12) : 4446 - 4450
[32] Structural investigation of Pd(II) in concentrated nitric and perchloric acid solutions by XAFS
Purans, J
Fourest, B
Cannes, C
Sladkov, V
David, F
Venault, L
Lecomte, M
[J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (21) : 11074 - 11082
[33] Characterization of silica-supported Pd-Au clusters by X-ray absorption spectroscopy
Reifsnyder, SN
Lamb, HH
[J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (02): : 321 - 329
[34] Direct formic acid fuel cells
Rice, C
Ha, RI
Masel, RI
Waszczuk, P
Wieckowski, A
Barnard, T
[J]. JOURNAL OF POWER SOURCES, 2002, 111 (01) : 83 - 89
[35] Size-dependent spontaneous alloying of Au-Ag nanoparticles
Shibata, T
Bunker, BA
Zhang, ZY
Meisel, D
Vardeman, CF
Gezelter, JD
[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2002, 124 (40) : 11989 - 11996
[36] Sinfelt J. H., 1983, BIMETALLIC CATALYSTS
[37] STRUCTURE OF BIMETALLIC CLUSTERS
SINFELT, JH
[J]. ACCOUNTS OF CHEMICAL RESEARCH, 1987, 20 (04) : 134 - 139
[38] SUPPORTED BIMETALLIC-CLUSTER CATALYSTS
SINFELT, JH
[J]. JOURNAL OF CATALYSIS, 1973, 29 (02) : 308 - 315
[39] APPLICATION OF EXAFS IN CATALYSIS - STRUCTURE OF BIMETALLIC CLUSTER CATALYSTS
SINFELT, JH
VIA, GH
LYTLE, FW
[J]. CATALYSIS REVIEWS-SCIENCE AND ENGINEERING, 1984, 26 (01): : 81 - 140
[40] THE UWXAFS ANALYSIS PACKAGE - PHILOSOPHY AND DETAILS
STERN, EA
NEWVILLE, M
RAVEL, B
YACOBY, Y
HASKEL, D
[J]. PHYSICA B-CONDENSED MATTER, 1995, 208 (1-4) : 117 - 120

← 1 2 3 4 5 →