ISSN:
0377-0486
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Surface-enhanced Raman scattering (SERS) spectroscopy was used to explore the electrochemical reduction of CO2 at a polycrystalline Ag electrode in KHCO3 aqueous solution saturated with CO2 at room temperature. Raman scattering from the oxidation-reduction cycled Ag electrode suggests the formation of CO and HCOOH by CO2 reduction. At an electrode potential of 0.08 V (vs. Ag/AgCl), adsorbed CO gives rise to a C-O stretch band at 2128 cm-1. This band decreases in intensity and shifts to higher wavenumber with an increase of negative potential in the range from 0.0 to - 0.24 V. A different potential dependence is observed for the C-H stretch mode of adsorbed HCOO- (2870 cm-1 at - 0.8 V). The O-C-O antisymmetric and symmetric stretch modes of HCOO- observed at near 1550 and 1350 cm-1 decrease in intensity with increasing negative potential, presenting a striking contrast to the C-H stretch mode. The SERS experiment with a CO2-saturated KHCO3—D2O solution is also described and discussed.
Additional Material:
9 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jrs.1250260503
Permalink
