Adsorption and hydrogenation of benzene at platinum electrode surfaces probed by confocal Raman microscopy
- 化学化工－已发表论文 
The electrochemical adsorption and hydrogenation of benzene on a roughened Pt electrode were studied by confocal Raman microscopy. Some forbidden vibrational bands of benzene were detected owing to the lowering of the symmetry upon adsorption. The results infer that benzene is adsorbed on the Pt surface in a flat orientation by its ring. By comparison, its adsorption was carried out on an ultrathin Pt film-coated Au electrode exhibiting higher SERS activity. It has been shown that benzene reacts with the adsorbed hydrogen, then is hydrogenated to cyclohexane on the Pt surface at negative potentials in acidic solution. This preliminary study provides evidence to support the fact that even weak adsorbates on pure transition metals can be studied by SERS spectroscopy. Copyright (C) 2003 John Wiley Sons, Ltd.