On the occurrence of competitive adsorption at the platinum-acetonitrile interface by using surface-enhanced Raman spectroscopy

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	On the occurrence of competitive adsorption at the platinum-acetonitrile interface by using surface-enhanced Raman spectroscopy
	Cao, PG ; Sun, YH ; Gu, RN ; Sun YH(孙玉华)
刊名	http://dx.doi.org/10.1021/jp027834j
	2003-06-19
关键词	TRANSITION-METAL INTERFACES SILVER ELECTRODE CARBON-MONOXIDE ELECTROCHEMICAL INTERFACES INFRARED-SPECTROSCOPY NICKEL ELECTRODES SCATTERING PYRIDINE SPECTRA ORIENTATION
英文摘要	Surface-enhanced Raman scattering (SERS) from the platinum electrode-acetonitrile interface in the presence of iodide, the lithium cation, water, and pyridine was analyzed as a function of applied potential. It was found that the typical Raman band of cyanide species by the dissociation of the solvent acetonitrile upon adsorption onto highly roughened platinum electrode surfaces was detectable for all of the systems that were studied. However, the onset potential of the dissociation reaction of acetontrile differed for the four systems. We assume that competitive adsorption may exist between each of the above four species and the solvent acetonitrile molecule, especially at the dissociation reaction-active sites of the Pt surface. This competitive adsorption therefore significantly inhibits the decomposition reaction of acetonitrile. The interactions of these adsorbates with Pt are assumed to weaken in the sequence pyridine > I- > water approximate to Li+ on the basis of the observations of different negative shifts of the onset potential of acetonitrile decomposition. For the system with water or iodide, double-band character for the CN band was also detected. It is assumed to be due to the existence of two types of adsorbed ion pairs at the Pt surface: CN-...CH3CN and CN-...Li+/Na+.
语种	英语
出版者	J PHYS CHEM B
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/88637]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Cao, PG,Sun, YH,Gu, RN,et al. On the occurrence of competitive adsorption at the platinum-acetonitrile interface by using surface-enhanced Raman spectroscopy[J]. http://dx.doi.org/10.1021/jp027834j,2003.
APA	Cao, PG,Sun, YH,Gu, RN,&孙玉华.(2003).On the occurrence of competitive adsorption at the platinum-acetonitrile interface by using surface-enhanced Raman spectroscopy.http://dx.doi.org/10.1021/jp027834j.
MLA	Cao, PG,et al."On the occurrence of competitive adsorption at the platinum-acetonitrile interface by using surface-enhanced Raman spectroscopy".http://dx.doi.org/10.1021/jp027834j (2003).