The electrocatalytic properties of adsorbed hemin and its nitrosyl adduct on glassy carbon surfaces toward hydroxylamine in aqueous neutral electrolytes

Balaji Kannan, Doe Kumsa, Adriel Jebin Jebaraj, Alia Méndez-Albores, Nicholas S. Georgescu, Daniel Alberto Scherson

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Cyclic voltammetry and dynamic and steady state polarization measurements have been used to examine the electrocatalytic activity of glassy carbon, GC, bearing a layer of adsorbed hemin, Hm, Hm | GC, toward hydroxylamine, NH2OH, in neutral aqueous solutions. The results obtained have provided ample evidence that Hm | GC promotes the reduction and oxidation of NH2OH, as well as its disproportionation. Also presented is a mechanistic model that accounts quantitatively for steady state polarization data for the reduction of NH2OH recorded with a Hm | GC rotating disk electrode, RDE. This model predicts that a very large fraction of the current is attributed to the reduction of a Hm species axially coordinated by a NH2OH molecule on one side and a nitrosyl group on the other at lower overpotentials and NH2OH on either side at higher overpotentials.

Original languageEnglish
Pages (from-to)250-256
Number of pages7
JournalJournal of Electroanalytical Chemistry
Volume793
DOIs
Publication statusPublished - 2017 May 15
Externally publishedYes

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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