Investigation on mechanism of catalysis by Pt-LiCoO2 for hydrolysis of sodium borohydride using X-ray absorption

被引：26
作者：
Liu, R. S. [1 ]
Lai, H. C. [1 ]
Bagkar, N. C. [1 ]
Kuo, H. T. [1 ]
Chen, H. M. [1 ]
Lee, J. -F. [2 ]
Chung, H. J.
Chang, S. M.
Weng, B. J.
机构：
[1] Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan
[2] Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2008年 / 112卷 / 16期
关键词：
D O I：
10.1021/jp075592n
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：
The synthesis of platinum nanoparticle loaded LiCoO2 (Pt-LiCoO2) was carried out successfully by an impregnation method followed by sintering at different temperatures. The catalytic role of Pt-LiCoO2 composite in hydrogen generation during hydrolysis of sodium borohydride (NaBH4) was studied for fuel cell applications. X-ray diffraction (XRD), transmission electron microscopy (TEM), and inductively coupled plasma-atomic emission spectroscopy (ICP-AES) have been used to elucidate the structural and catalytic properties of Pt-LiCoO2. It was found that the 15 wt % of Pt nanoparticles on LiCoO2 sintered at 450 degrees C support showed the maximum efficiency for the catalysis reaction of hydrogen production. X-ray absorption near edge structure (XANES) analysis and extended X-ray absorption fine structure (EXAFS) analysis using a synchrotron radiation source were performed to carry out ex situ measurements in order to understand the mechanism of the catalytic process for the production of hydrogen during the hydrolysis of NaBH4. Co K-edge XANES showed a small percentage of cobalt in the metallic form after hydrogen generation which suggests the reduction of the cobalt during the hydrolysis of NaBH4.
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收藏
页码：4870 / 4875
页数：6
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