Reply to the 'Comments on the paper by M.-S. Zheng and S.-G. Sun entitled 'In situ FTIR spectroscopic studies of CO adsorption on electrodes with nanometer-scale thin films of ruthenium in sulfuric acid solutions' by C. Pecharroman, A. Cuesta and C.

摘要

In our recent paper (J. Electroanal. Chem. 500(2001) 223), we reported the abnormal IR features of CO adsorbed on electrodes of nanometer-scale thin films of ruthenium electrodeposited on a glassy carbon (GC) substrate. In comparison with the IR features of CO adsorbed on electrodes of massive Pt [1] or Ru [2], the direction of the IR bands of CO_(ad) (CO_L and CO_B) was inverted, the intensity was significantly enhanced and the FWHM (full width at half maximum) was increased. The abnormal IR features of CO adsorbed on electrodes of nanometer-scale thin films of Pt supported oN GC (nm-Pt/GC) were observed by my research group in 1995, and reported for the first time in 196 at the 189th ECS meeting in Los Angles [3]. After a series of studies of in situ FTIR spectroscopy [1,3-13] on different molecules (CO, SCN~-, CN~-, PoPD) adsorbed on nm-Pt/GC, CO adsorbed on nm-Pt supported on different substrate materials (GC, graphite, Au, Pt, ppy film, etc.), and nanometer-scale thin films of different platinum group metals (Pt, Pd, Rh, Ru, etc.), we found that these abnormal IR features were related mainly to the properties of nanometer-scale thin film materials, and therefore called the group of abnormal IR features ab normal infrared effects (AIREs) [1]. The AIREs include three abnormal IR features of CO or other molecules adsorbed on nanometer scale thin films of platinum group metals and alloys: (1) the inversion of the IR band direction; (2) a significant enhancement in IR absorption; (3) the increase of FWHM of IR bands. In our recent paper [13], commented upon by Pecharroman, Cuesta and Gutierrez, we reported mainly experimental results of in situ FTIR spectroscopic studies of CO adsorbed on nanometer-scale thin Ru film in acid solutions. In replying to the comment, I will emphasize the following points in this note.