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Sulphate adsorption at chemically deposited silver thin film electrodes: time-dependent behaviour as studied by internal reflection step-scan infrared spectroscopy |
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| Affiliation: | 1. Science Systems and Applications Incorporated, 1 Enterprise Parkway, Hampton, VA 23666, USA;2. Climate Science Branch, Mail Stop 420, NASA Langley Research Center, Hampton, VA, 23681-2199, USAn;3. Remote Sensing Branch, Mail Stop 468, NASA Langley Research Center, Hampton, VA, 23681-2199, USA;4. Space Dynamics Laboratory, 1695 Research Park Way, Logan, UT 84341, USA;5. Global Systems Division, Earth System Research Laboratory, NOAA, 325 Broadway, Boulder, CO 80305, USA;6. Atmospheric and Environmental Research, Lexington, Massachusetts, USA;1. Research Service, VA Boston Healthcare System, Department of Psychiatry, Boston University School of Medicine, Boston, MA USA |
| Abstract: | Stable silver thin films were chemically deposited on a germanium substrate. Ex-situ STM images showed that these films are formed by grains with a diameter between 20 and 100 nm. The silver films have been used as the working electrode in infrared spectroelectrochemical experiments with an internal reflection (Kretschmann) configuration. The adsorption of sulphate anions in neutral or slightly acidic solutions has been studied. The high intensity of the S–O stretching bands in the absorption spectra allowed the monitoring of the time-dependent behaviour of the adsorption/desorption processes in time-domain step-scan experiments. |
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