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Acta Phys. -Chim. Sin.  2015, Vol. 31 Issue (2): 199-203    DOI: 10.3866/PKU.WHXB201412011
COMMUNICATION     
Surface Enhanced Infrared Absorption Spectroscopic Investigation of CO Electrosorption and Electrooxidation on Pt Nanocrystals
DUOLIKUN Reyisha1, YANG Yao-Yue2, CAI Wen-Bin1
1. Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200433, P. R. China;
2. College of Chemistry and Environment Protection Engineering, Southwest University for Nationalities, Chengdu 610041, P. R. China
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Abstract  

Electrochemical attenuated total reflection-surface enhanced infrared absorption spectroscopy (ATRSEIRAS) has been used to investigate the facet-dependent adsorption and oxidation of CO on the {100}- preferred Pt nanocrystals (NCs). The cyclic voltammogram for the synthesized and then cleaned Pt NCs in a sulfuric acid solution displayed four pairs of redox peaks. The peaks located at 0.26 and 0.36 V were attributed to interfacial hydrogen electro-adsorption/desorption processes on the short- and long-range Pt{100} domains, respectively. Furthermore, the Pt{100} and Pt{111} domains were estimated to account for 34% and 14% of the active sites on the surfaces of the Pt NCs, respectively, based on Bi and Ge irreversible adsorption methods. Potential-dependent spectral features can be used to differentiate the adsorption and oxidation processes of linearly adsorbed CO (COL) species on the three basic planes of the Pt NCs. COL species on the Pt{110} facets were oxidized preferentially, followed sequentially by those on the Pt{111} and Pt{100} facets. COL on Pt{100} required the highest overpotential for their oxidation.



Key wordsPt nanocrystal      CO      Electrosorption      Electrooxidation      Surface enhanced infrared absorption spectroscopy     
Received: 12 September 2014      Published: 01 December 2014
MSC2000:  O646  
Fund:  

The project was supported by the National Natural Science Foundation of China (21273046).

Corresponding Authors: YANG Yao-Yue, CAI Wen-Bin     E-mail: yaoyueyoung@163.com;wbcai@fudan.edu.cn
Cite this article:

DUOLIKUN Reyisha, YANG Yao-Yue, CAI Wen-Bin. Surface Enhanced Infrared Absorption Spectroscopic Investigation of CO Electrosorption and Electrooxidation on Pt Nanocrystals. Acta Phys. -Chim. Sin., 2015, 31(2): 199-203.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201412011     OR     http://www.whxb.pku.edu.cn/Y2015/V31/I2/199

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