In situ FTIR Study of CO2 Reduction on Polycrystalline Platinum in Acid Solutions

摘要

The reduction of CO2 on polycrystalline Pt in 0.1 M HCl04 has been investigatedwith in situ Fourier Transform Infrared Reflection, Absorption Spectroscopy and electrochemical techniques. Both methods have provided clear evidence that the reaction proceeds at potentials at which adsorbed hydrogen is also present on the surface. Based on the spectroscopic information it has been concluded that linear and bridge-bonded forms of adsorbed CO are the only detectable reduction products with the latter achieving saturation coverage well before the peak associated with linearly bonded Co reaches maximum intensity. Two similar CO bands have also been observed by other authors for CO2 reduction on Pt in 0.5 M using the EMIRS technique. The low energy band, however, was described by these authors to CO bound on a three-fold site.