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采用现场表面增强拉曼光谱(SERS)研究了4-氰基吡啶在不同pH值下铂电极上的吸附行为。结果表明,pH对4-氰基吡啶的吸附原子没有影响,均以吡啶环上的氮吸附在电极表面,但分子的取向不同。酸性条件下,4-氰基吡啶在正于0.6V(SCE)的电位区间倾斜吸附,在0.6V到-0.2V以相对垂直方式吸附,而在负于-0.4V的电位区间,分子倾向于平躺吸附;中性条件下,在0V附近,分子由从相对垂直吸附向倾斜吸附转变;碱性条件下,分子在可测的整个电位区间内保持近乎垂直的方式吸附在铂电极上。
In situ surface-enhanced Raman spectroscopy (SERS) was used to study the adsorption behavior of 4-cyanopyridine on Pt electrode at different pH values. The results showed that pH had no effect on the adsorption of 4-cyanopyridine, and the nitrogen on the pyridine ring adsorbed on the surface of the electrode, but the molecular orientation was different. Under acidic conditions, 4-cyanopyridine adsorbs obliquely in the positive potential range of 0.6V (SCE) and relatively vertically in the range of 0.6V to -0.2V, while in the negative potential range of -0.4V, In the neutral condition, at 0 V, the molecule transitions from a relatively vertical adsorption to an inclined adsorption; in alkaline conditions, the molecule is adsorbed on the platinum electrode in a nearly vertical manner throughout the measurable range of potential.