Electrocatalysis

, Volume 3, Issue 1, pp 39–47

New Cell for DEMS Applicable to Different Electrode Sizes

  • Abd-El-Aziz A. Abd-El-Latif
  • Jie Xu
  • Nicky Bogolowski
  • Peter Königshoven
  • Helmut Baltruschat
Article

DOI: 10.1007/s12678-011-0074-x

Cite this article as:
Abd-El-Latif, AEA.A., Xu, J., Bogolowski, N. et al. Electrocatal (2012) 3: 39. doi:10.1007/s12678-011-0074-x

Abstract

Present approaches to use simple crystal electrodes for DEMS have certain disadvantages: Thin layer cells with defined diffusion and/or convection require large single discs of 1 cm diameter; also, a part of the crystal surface has to be pressed against a spacer. Other approaches, which allow the use of small bead crystals, have the disadvantage of ill-defined mass transport from the surface into the vacuum of the mass spectrometer. Here, we present a new approach which combines the advantage of defined convection of one dual thin layer cell with the possibility to use small bead crystals. The usual hanging meniscus is replaced by a cone-shaped capillary, through which electrolyte is flowing to a thin layer mass spectrometric detection compartment. In order to ensure a stable hanging meniscus at the electrode, the electrolyte level is maintained at constant height with the help of a second electrolyte pump adjusted to the same electrolyte flow as that sucked through the capillary. We demonstrate the quality of single-crystal voltammetry in this arrangement and its use for the examination of formic acid and methanol oxidation on Pt(100), Pt(15 1 1), and Pt(711). Current efficiencies for CO2 during methanol oxidation were also determined.

Keywords

DEMS cellBead single-crystal electrodeHanging meniscusMethanol oxidationElectrochemical mass spectrometry

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Abd-El-Aziz A. Abd-El-Latif
    • 1
    • 2
  • Jie Xu
    • 1
    • 3
  • Nicky Bogolowski
    • 1
  • Peter Königshoven
    • 1
  • Helmut Baltruschat
    • 1
  1. 1.Institute of Physical and Theoretical ChemistryUniversity of BonnBonnGermany
  2. 2.National Research Centre, Electrochemistry and Corrosion DepartmentCairoEgypt
  3. 3.Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical PhysicsUniversity of Science and Technology of ChinaHefeiChina