The oxidation of hydroxylamine on Pt-, and Pd-modified Au electrodes in aqueous electrolytes: Electrochemical and in situ spectroscopic studies

Adriel Jebin Jacob Jebaraj, Denis Ricardo Martins De Godoi, Daniel Alberto Scherson

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The electrooxidation of hydroxylamine, NH2OH, in 0.1 M phosphate buffer (PB, pH = 7) on Pt-, and Pd-modified Au electrodes prepared by galvanic displacement of underpotential deposited Cu, was investigated by electrochemical techniques and three and in situ vibrational probes, substrate-induced surface enhanced Raman scattering, SI-SERS, surface enhanced infrared absorption, SEIRAS, and Fourier transform infrared reflection-absorption, IRAS, spectroscopies. Analyses of the results obtained made it possible to identify at low overpotentials, solution phase (sol) and adsorbed (ads) nitric oxide, NO, as well as solution phase nitrous oxide, N2O. As the potential was increased, the peak(s) ascribed to NO(ads) gained in intensity and new features associated with NO2-(ads) and NO2 -(sol) were clearly discerned. Further excursion toward higher potentials yielded an additional peak assigned to NO2(ads). This behavior is analogous to that found for bare Au electrodes in a potential region in which the metal is at least partially oxidized under otherwise the same experimental conditions.

Original languageEnglish
Pages (from-to)44-49
Number of pages6
JournalCatalysis Today
Volume202
Issue number1
DOIs
Publication statusPublished - 2013 Mar 15
Externally publishedYes

Fingerprint

Hydroxylamine
Polymethyl Methacrylate
Sols
Electrolytes
Oxidation
Electrodes
Electrooxidation
Nitric oxide
Nitrous Oxide
Infrared absorption
Absorption spectroscopy
Raman scattering
Fourier transforms
Buffers
Nitric Oxide
Phosphates
Metals
Infrared radiation
Oxides
Substrates

Keywords

  • Electrocatalysis
  • Gold
  • Hydroxylamine oxidation
  • In situ spectroscopy
  • Palladium
  • Platinum

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

The oxidation of hydroxylamine on Pt-, and Pd-modified Au electrodes in aqueous electrolytes : Electrochemical and in situ spectroscopic studies. / Jebaraj, Adriel Jebin Jacob; De Godoi, Denis Ricardo Martins; Scherson, Daniel Alberto.

In: Catalysis Today, Vol. 202, No. 1, 15.03.2013, p. 44-49.

Research output: Contribution to journalArticle

Jebaraj, Adriel Jebin Jacob ; De Godoi, Denis Ricardo Martins ; Scherson, Daniel Alberto. / The oxidation of hydroxylamine on Pt-, and Pd-modified Au electrodes in aqueous electrolytes : Electrochemical and in situ spectroscopic studies. In: Catalysis Today. 2013 ; Vol. 202, No. 1. pp. 44-49.
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