期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 662, 期 2, 页码 426-431出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2011.09.020
关键词
Adsorption; Cyanopyridines; Pt electrode; Orientation; Surface-enhanced Raman spectroscopy
资金
- Natural Science Foundation of China (NSFC) [20973120, 21073128, 21033007]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Soochow University
The adsorption of three cyanopyridine isomers on Pt electrodes was investigated using electrochemical surface-enhanced Raman spectroscopy (SERS) within a wide potential region. It was revealed that the adsorption configurations depend on the applied potential and on the positions of CN group. The 4-cyanopyridine (4-CP) and 3-cyanopyridine (3-CP) molecules adsorb on Pt surfaces via the N atoms of the pyridine ring, while the 2-cyanopyridine (2-CP) molecules attach to the surface with the N atoms of both the pyridine ring and the CN group. In the case of 4-CP, the tilted adsorption mode is dominant under the potential of -0.8-0 V. It is converted to the vertical mode when the potential is moved to 0-0.8 V. For 3-CP, the vertical adsorption mode is found to be preferential in the full potential window. The C=N stretching vibrational band of 2-CP is absent in the observed SER spectra. This is mainly caused by the characteristic pi-electron delocalization as both N atoms are anchored to the Pt surface to form a heterogeneous ring. The hydrogen atoms are co-adsorbed with the cyanopyridine isomers on the Pt surface in extremely negative potential region. (C) 2011 Elsevier B.V. All rights reserved.
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