Kinetics of oxygen reduction on gold nanoparticle/multi-walled carbon nanotube hybrid electrodes in acid media

Nadezda Alexeyeva, Leonard Matisen, Agu Saar, Päivi Laaksonen, Kyösti Kontturi, Kaido Tammeveski*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

In this paper, the electrochemical reduction of oxygen has been studied on gold nanoparticle/multiwalled carbon nanotube (AuNP/MWCNT) modified glassy carbon (GC) electrodes in 0.5 M H2SO4 using the rotating disk electrode (RDE) method. The AuNP/MWCNT catalysts were prepared by chemical deposition of AuNPs onto MWCNTs spontaneously grafted with 4-nitrophenyl groups. The composite electrode was characterised by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry (CV). The oxygen reduction behaviour of these electrodes was compared with that of a bulk gold electrode. The AuNP/MWCNT catalyst showed a pronounced electrocatalytic activity towards O-2 reduction in acid media. The half-wave potential of O-2 reduction on the AuNP/MWCNT catalyst shifted ca 80 mV to more positive potentials as compared to that of a polished Au electrode. The kinetic parameters of oxygen reduction were determined and the specific activity of the hybrid electrode was slightly higher than that of the bulk Au electrode. (C) 2010 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)6-12
Number of pages7
JournalJournal of Electroanalytical Chemistry
Volume642
Issue number1
DOIs
Publication statusPublished - 1 Apr 2010
MoE publication typeA1 Journal article-refereed

Keywords

  • Oxygen reduction
  • Electrocatalysis
  • Gold nanoparticles
  • Carbon nanotubes
  • BORON-DOPED DIAMOND
  • ELECTROCHEMICAL REDUCTION
  • ELECTROCATALYTIC REDUCTION
  • CRYSTALLOGRAPHIC ORIENTATION
  • DIOXYGEN REDUCTION
  • THIN-FILM
  • ELECTROREDUCTION
  • SURFACE
  • SIZE
  • CATALYSTS

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