Pt纳米晶上CO电吸附及电氧化的表面增强红外吸收光谱研究

doi:10.3866/PKU.WHXB201412011

Abstract

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 (CO_L) species on the three basic planes of the Pt NCs. CO_L species on the Pt{110} facets were oxidized preferentially, followed sequentially by those on the Pt{111} and Pt{100} facets. CO_L on Pt{100} required the highest overpotential for their oxidation.

Key words: Pt nanocrystal, CO, Electrosorption, Electrooxidation, Surface enhanced infrared absorption spectroscopy

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

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Surface Enhanced Infrared Absorption Spectroscopic Investigation of CO Electrosorption and Electrooxidation on Pt Nanocrystals

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