Adsorption of thiourea on copper electrodes monitored by in situ infrared spectroscopy
- Univ. of Illinois, Urbana, IL (United States)
In situ infrared (IR) spectroscopy was used to monitor the adsorption of thiourea onto copper electrodes in 0.5 M sulfuric acid solutions under cathodic polarization. At potentials negative of the open-circuit potential, p-polarized IR spectra provided evidence for the partial desorption of TU. The desorption had a reversible character as indicated by the recovery of the spectra upon reestablishing open-circuit conditions. Thiourea bands appearing in s-polarized spectra at very negative potentials were attributed to deprotonation of thiourea within the thin-layer gap of the cell resulting from hydrogen ion reduction. Both the bulk, s-polarized, and surface, p-polarized, spectra showed bipolar symmetric N-C-N vibrational bands. The bands were attributed to changes in N-C-N bond order resulting from protonation of the S atom or adsorption of the thiourea via the S atom, respectively.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG02-91ER45439
- OSTI ID:
- 659167
- Journal Information:
- Journal of the Electrochemical Society, Vol. 145, Issue 10; Other Information: PBD: Oct 1998
- Country of Publication:
- United States
- Language:
- English
Similar Records
Adsorption of carbon monoxide on a smooth palladium electrode: an in-situ infrared spectroscopic study
Ground electronic state description of thiourea coordination in homoleptic Zn2+, Ni2+ and Co2+ complexes using sulfur K-edge X-ray absorption spectroscopy