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Electrochemical and XPS studies of the properties of oxide layers formed on a platinum electrode by anodic polarization in pure H2SO4and in (H2SO4+CNS−

Authors
Journal
Electrochimica Acta
0013-4686
Publisher
Elsevier
Publication Date
Volume
34
Issue
2
Identifiers
DOI: 10.1016/0013-4686(89)87076-8
Disciplines
  • Chemistry

Abstract

Abstract An electrochemical voltammetric analysis of oxide layers formed by anodic polarization of platinum electrodes over the potential range 2.4–3.0 V has shown that the reduction of the layers produced in pure H 2SO 4 occurs in two well defied waves, whereas the oxides formed by polarization in CNS − containing solutions cannot be distinguished during the reduction into separate types. An XPS analysis has indicated that platinum oxide layers produced in pure 5 M H 2SO 4 are composed of Pt+Pt(OH) 4 with various Pt/O ratios, depending on the potential and time of polarization. Layers formed in solutions with added CNS − contain firmly bound nitrogen, but no sulphur.

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