Abstract

The thin layer flow cell geometry with working and auxiliary electrodes directly facing each other, allows electrosynthetic processes to be conducted in flow-through mode. At sufficiently small cell height, the two diffusion layers of working and auxiliary electrode overlap or become 'coupled'. As a result electro-generated acids or bases are instantaneously neutralised, products from anode and cathode can interact, and, more importantly, bulk electrolysis is possible without intentionally added electrolyte. In this preliminary report, the operation of a micro-flow cell with coupled diffusion layers is demonstrated for the one electron oxidation of ferrocene and for the two electron-two proton reduction of tetraethyl ethylenetetracarboxylate dissolved in ethanol. In proof-of-principle bulk electrolysis experiments without intentionally added electrolyte, high yields of the product, tetraethyl ethanetetracarboxylate are obtained at a nickel working electrode. It is demonstrated that a sufficient concentration of electrolyte for bulk electrolysis is generated locally and in situ between working and auxiliary electrode.

Original languageEnglish
Pages (from-to)825-831
Number of pages7
JournalElectrochemistry Communications
Volume4
Issue number10
DOIs
Publication statusPublished - 1 Oct 2002

Keywords

  • Bulk electrolysis
  • Coupled processes
  • Lab-on-a-chip
  • Micro-reactor
  • Overlapping diffusion layer
  • Paired electrosynthesis
  • Raney nickel
  • Thin layer flow cell
  • Voltammetry

ASJC Scopus subject areas

  • Electrochemistry

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