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New findings on hydrogen and anion adsorption at a Pt(111) electrode in aqueous H2SO4 solution generated by temperature variation by Alireza Zolfaghari; Gregory Jerkiewicz is a Engineering article available to read on EtoBox.

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Temperature dependence studies of the under-potential deposition of H (upd H) and anion adsorption on Pt(I ! I) in 0.5 M aqueous H2SO 4 solu\*.Jon by cyclic voltammetry (CV) indicate that the overall adsorption-desorption charge del~sity is only slightly affected by temperature T variation, and that it decreases by 25 pC cm-2 when T is raised from 275 to 338 K. Introductory deconvolution of the CV into two components assigned to the upd H and the anion adsorption indicates that the charge density associated with the upd H decreases by 20 ItC cm -2, whereas that of the anion adsorption decreases by only 5 p.C cm -2. The potential of the sharp peak in the potential region corresponding to the anion adsorption shifts towards more positive values upon T increase and the peak current density shifts towards lower values. The behaviour of the third, asymmetric peak in the double layer region is complex; the anodic and cathodic components shift towards less positive potentials but the displacement of the anodic one is more pronounced. The results indicate that the H upo and anion surface coverages 0tt -~ and 0AN respectively are slightly temperature dependent; this behaviour may be assigne

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Author

Alireza Zolfaghari; Gregory Jerkiewicz

Publisher

Elsevier ; Elsevier BV (ISSN 1572-6657)

Published

1997

Language

EN

Field

Engineering (Physical Sciences)