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

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

Fingerprint

Hemin
Hydroxylamine
Glassy carbon
Electrolytes
Bearings (structural)
Polarization
Rotating disks
Cyclic voltammetry
Oxidation
Electrodes
Molecules

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

Cite this

The electrocatalytic properties of adsorbed hemin and its nitrosyl adduct on glassy carbon surfaces toward hydroxylamine in aqueous neutral electrolytes. / Kannan, Balaji; Kumsa, Doe; Jebaraj, Adriel Jebin; Méndez-Albores, Alia; Georgescu, Nicholas S.; Scherson, Daniel Alberto.

In: Journal of Electroanalytical Chemistry, Vol. 793, 15.05.2017, p. 250-256.

Research output: Contribution to journalArticle

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AU - Méndez-Albores, Alia

AU - Georgescu, Nicholas S.

AU - Scherson, Daniel Alberto

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AB - 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.

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