Stripping chronopotentiometry at scanned deposition (SSCP). Part 3. Irreversible electrode reactions

H.P. van Leeuwen, R.M. Town

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)

Abstract

A rigorous expression is derived for the scanned deposition potential stripping chronopotentiometry (SSCP) curve for the case of quasi-reversible and irreversible redox reactions. The equation is fully applicable to both a conventional (macro) electrode and a microelectrode. SSCP curves are shown to have a spectacular insensitivity to electrochemical irreversibility and this feature is even more pronounced at a microelectrode. These observations can be readily explained by considering the relative location of the curves on the potential axis. Modification of the experimental conditions (deposition time, electrode volume) allows the extent of resistance to irreversibility to be manipulated. These remarkable characteristics have far-reaching implications for in situ analysis, and allow the effects of irreversibility to be easily distinguished from e.g. those of chemical heterogeneity in the metal speciation.
Original languageEnglish
Pages (from-to)93-102
JournalJournal of Electroanalytical Chemistry
Volume556
DOIs
Publication statusPublished - 2003

Keywords

  • differential-pulse polarography
  • metal speciation analysis
  • fundamental features
  • mercury-electrodes
  • parameters
  • reduction
  • surface

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