In situ spectroelectrochemistry at free-standing liquid-liquid interfaces: UV-vis spectroscopy, microfocus X-ray absorption spectroscopy, and fluorescence imaging

Research output: Contribution to journalArticle

  • Authors:
  • Sven Schroeder
  • Yvonne Gründer
  • J. Frederick W Mosselmans
  • Sven L M Schroeder
  • Robert A W Dryfe

Abstract

A windowless electrochemical cell for the spectroscopic investigation of the liquid-liquid interface, using a dual droplet configuration, has been designed. The setup permits in situ probing of the bulk solutions and the interfacial region by fiber-optic UV-vis spectroscopy, microfocus X-ray fluorescence (XRF) elemental mapping, and microfocus X-ray absorption near-edge structure (μXANES) spectroscopy. The electrodeposition of Au, induced by ion transfer of the tetrachloroaurate complex from a halogenated solvent (containing a weak reducing agent) to the aqueous phase, has been monitored by a combination of the three techniques. The reaction can be followed in situ by UV-vis spectroscopy by detecting the oxidized form of the reducing agent. Voltammetric evidence suggests the formation of interfacial Au(I) species, whereas μXANES detect the presence of metallic Au(0). © 2013 American Chemical Society.

Bibliographical metadata

Original languageEnglish
Pages (from-to)5765-5773
Number of pages8
JournalJournal of Physical Chemistry C
Volume117
Issue number11
DOIs
Publication statusPublished - 21 Mar 2013