Spatial scanning spectroelectrochemistry. Study of the electrodeposition of Pd nanoparticles at the liquid/liquid interface

Research output: Contribution to journalArticle

Researchers

  • Daniel Izquierdo
  • Alberto Martinez
  • Aranzazu Heras
  • Jesus Lopez-Palacios
  • Virginia Ruiz
  • Robert A W Dryfe
  • Alvaro Colina

Research units

  • Universidad de Burgos
  • University of Manchester

Abstract

Spatial scanning spectroelectrochemistry is a new analytical technique that provides spectral information at different distances from an electrified liquid/liquid interface where an electrochemical process takes place. As a proof of concept, we have studied two different electrochemical processes at the electrified liquid/liquid interface: (1) Ru(bpy) 3 2+ transfer through the water/1,2-dichloroethane interface and (2) electrodeposition of Pd nanoparticles at the water/1,2-dichloroethane interface. The instrumental setup developed consists of a movable slit for the light beam to sample at well-defined positions on both sides of the interface, providing important information about the chemical process occurring. If the slit is scanned at different distances from the interface during an electrochemical experiment, a complete picture of the reactions and equilibria in the diffusion layer can be obtained. For example, in the case of the Ru(bpy) 3 2+, the experiments show clearly how the complex is transferred from one phase to the other. In the case of electrosynthesis of Pd nanoparticles, it is demonstrated that nanoparticles are not only deposited at the interface but diffuse to the aqueous bulk solution. These in situ observations were confirmed by ex situ experiments using transmission electron microscopy.

Details

Original languageEnglish
Pages (from-to)5723-5730
Number of pages8
JournalAnalytical Chemistry
Volume84
Issue number13
Publication statusPublished - 3 Jul 2012
MoE publication typeA1 Journal article-refereed

ID: 15878344