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利用电化学和表面增强拉曼光谱方法研究了咪唑和钴电极的相互作用.分析并指认了不同电极电位下咪唑溶液中钴电极上的表面增强拉曼光谱(SERS),发现随电极电位的变化,在钴电极表面存在三种表面物种并且可以在一定程度上相互转化.在较负电位(?1.2~?0.9V)区间,咪唑在钴电极表面以吸附物种为主,随电位正移,吸附取向由通过吡啶N垂直吸附逐渐向C2=N3双键倾斜;在较正电位区间(?0.8~?0.7V)内,吸附咪唑的信号逐渐减弱乃至消失,而钴和咪唑的络合物信号逐渐增强;开路电位(?0.6V)下出现很强的钴的氧化物谱峰.同时,文中比较了钴电极表面在空白溶液和加入咪唑后的溶液中的极化曲线,发现咪唑对钴电极的缓蚀作用较为明显.该研究结果表明,联合表面增强拉曼光谱技术和电化学方法使得人们可以从分子水平上了解表面物种和电极表面间复杂的相互作用.
The interaction between imidazole and cobalt electrodes was investigated by electrochemical and surface-enhanced Raman spectroscopy.The surface enhanced Raman spectra (SERS) of cobalt electrodes in imidazole solution at different electrode potentials were analyzed and identified. It was found that with the change of electrode potential , There are three surface species on the surface of cobalt electrode and can transform to some extent.In the range of more negative potential (? 1.2 ~? 0.9V), imidazole is mainly adsorbed on the surface of cobalt electrode, The orientation was inclined to the C2 = N3 double bond by vertical adsorption of pyridine N; in the positive potential interval (? 0.8 ~? 0.7V), the signal of imidazole adsorption gradually decreased or disappeared, while the complex signals of cobalt and imidazole gradually And the strong peak of cobalt oxide appeared at the open circuit potential (-0.6 V) .At the same time, the polarization curves of the cobalt electrode surface in blank solution and imidazole solution were compared and found that the effect of imidazole on the cobalt electrode The results show that the combined surface-enhanced Raman spectroscopy and electrochemical methods make it possible to understand the complex interactions at the molecular level between surface species and electrode surfaces.