Application of vertical micro-disk MHD electrode to the analysis of heterogeneous magneto-convection

Atsushi Sugiyama, Makoto Hashiride, Ryoichi Morimoto, Yutaka Nagai, Ryoichi Aogaki

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

With a micro-disk electrode in vertical magnetic fields, heterogeneous magneto-convection in vertical magnetic fields was quantitatively examined for the redox reaction of ferrocyanide-ferricyanide ions. It was concluded that the current density controlled by the magneto-convection is in proportion to the l/3rd power of the product of the magnetic flux density and its gradient. Then, by using the same electrode system, the diffusion current induced by the vertical MHD (magnetohydrodynamic) flow was measured for the reduction of cuprous ions to copper atoms. The current density in this case was, as theoretically predicted, a function of the 1st power of the magnetic flux density. Finally, to visualize this characteristic flow pattern of the vertical MHD flow, copper electrodeposition onto the micro-disk electrode in a vertical magnetic field was performed; a typical morphological pattern of the deposit (single micro-mystery circle) was observed, as expected.

Original languageEnglish
Pages (from-to)5115-5124
Number of pages10
JournalElectrochimica Acta
Volume49
Issue number28
DOIs
Publication statusPublished - 2004 Nov 1

Keywords

  • Electrodeposition
  • Magnetic field effect
  • Magneto-convection
  • Micro-disk electrode
  • Redox reaction
  • Vertical-MHD flow

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

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