کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
219423 | 463274 | 2011 | 5 صفحه PDF | دانلود رایگان |
The paper reports in situ surface enhanced Raman scattering (SERS) spectroelectrochemistry study of sulfur adsorption and electro-oxidation on highly roughened polycrystalline Pt surface. It is intended to address a specific question: Does the final chemical state of the adsorbed sulfur species depend on the initial chemical state of the sulfur in deposition sources? Three different sulfur deposition sources were used: Na2S solution, electrochemically reductive SO2 solution, and S0 suspension. In all cases, the same dominant vibrational band at 300 cm−1 was observed on the freshly prepared S-adsorbed Pt electrode, indicating the same chemical state of the adsorbed sulfur which was recently assigned as the Pt–S2−. Possible spill-over sulfur adsorption from the deposited solid polymeric S80 was observed. Overall, this work yielded important information on sulfur adsorption and electro-oxidation on roughened, polycrystalline platinum surfaces and demonstrated clearly the applicability and usefulness of the in situ SERS spectroelectrochemistry in investigating the chemistry of sulfur adsorption/poisoning on platinum surfaces.
► We did in situ SERS study on sulfur covered roughened polycrystalline Pt surface.
► Adsorbed sulfur was generated from three different sources.
► The same Raman vibrational band at 300 cm−1 was observed in all cases.
► The chemical state of adsorbed sulfur was independent of the sources.
Journal: Journal of Electroanalytical Chemistry - Volume 662, Issue 1, 1 November 2011, Pages 52–56