Abstract
The adsorption of naphthalene, tetraline and biphenyl at Pt(111), roughened Pt(111) and polycrystalline Pt electrodes was studied using differential electrochemical mass spectrometry (DEMS). From the amount of CO 2 evolved during oxidation of the adsorbate layers, coverages were estimated to be around 0.2 nmol cm −2 for all three molecules. However, in the case of naphthalene and tetraline, oxidation charges per CO 2 molecule are somewhat (20–30%) larger than expected theoretically, indicating that oxidation does not lead only to CO 2, but also to other, nonvolatile oxidation products. Adsorbed biphenyl can be largely desorbed at potentials in the hydrogen region and below as biphenyl itself from Pt(111) and as the completely hydrogenated product bicyclohexyl from a roughened Pt(111). Interestingly a usual polycrystalline electrode is much less active towards hydrogenation, leading to cyclohexylbenzene as the main desorption product. Less than half of the adsorbate formed from naphthalene or tetraline can be desorbed under the same conditions, again the Pt(111) surface being the least, and the roughened Pt(111) being the most active surface for complete hydrogenation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
