关键词: 现场多步FTIR光谱, 表面过程, 孪生吸附态, 一氧化碳, 铑电极

Abstract: Because of its great importance both in electrocatalysis and C1 chemistry applications, the adsorption of CO on metallic electrodes such as Pt, Pd, Au, Ag, RhF￣[1～2], etc. has been extensively studied by in situ infrared spectroscopy Since 1981. In all these studies only three types of CO adsorbates, i. e. , linear (2 090～2 000 cm￣(-1)), bridgrd (2 000～1 900 cm￣(-1)) or multi-bonded (1900～1 800 cm￣(-1)) species, were identified. A different absorbate, twin CO on rhodium ((Rh (CO)2) , does exist on the solid/gas interface of highly dispersed Rh or Rhn clusters[3～4] on supports,this species originating a doublet at 2100 and 2030 cm￣(-1) for its symmetrical and asymmetrical stretch modes, respectively. To our knowledge, this doublet has not been reported yet for the Rh/electrolyre interface.