沉积铁钝化膜的傅立叶变换表面增强拉曼光谱

利用恒电流沉积技术、傅立叶变换表面增强拉曼散射技术现场研究了0 1mol/LNaOH溶液中铁金属电极在不同电位下的表面氧化物的组成。结果表明,在电极预钝化区,表面首先生成的Fe(OH)2可由拉曼谱图中出现的550cm-1表征,证实了以往的研究结果。进入钝化区,表面二价氧化物逐步转化为高价氧化物Fe3O4及α 、δ 和γ FeOOH。在电位回扫的过程中,各氧化产物的还原以及铁表面SERS活性的逐渐消失导致谱峰强度降低。

Fourier Transform Surface-enhanced Raman Spectroscopy from the Deposited Passivation Film of Iron

The Fourier Transform surfaceenhanced Raman scattering spectrum from a deposited iron electrode as a function of applied potential has been obtained. Currentstatic deposition method was utilized. Results show that Fe(OH)2 exists in the prepassivation region, which was corroborated by the appearance of the band at 550 cm-1. A transform to highvalence iron oxides such as Fe3O4, α、δ and γFeOOH occurred in the passivation region. On scanning potential back to negative values, the reduction of surface oxides combined with the quenching of the SERS active sites resulted in the decrease in intensity of the band of surface iron oxide species.