Skip to main content
Article
High Rate Detection of Volatile Products Using Differential Electrochemical Mass Spectrometry: Combining an Electrode-Coated Membrane with Hydrodynamic Flow in a Wall-Tube Configuration
Analytical Chemistry
  • Subramanian Venkatachalam, Iowa State University
  • Robert J. Angelici, Iowa State University
  • L. Keith Woo, Iowa State University
  • Andrew C. Hillier, Iowa State University
Document Type
Article
Publication Date
1-1-2013
DOI
10.1021/ac400928p
Abstract
We present an experimental system that combines differential electrochemical mass spectrometry with hydrodynamic flow consisting of an impinging jet in a wall-tube configuration. This assembly allows simultaneous detection of electrochemical signals along with monitoring of dissolved gas species using differential electrochemical mass spectrometry under well-defined hydrodynamic conditions and over a wide range of mass transfer rates. The working electrode is deposited directly onto a thin, hydrophobic membrane, which also serves as the inlet to the mass spectrometer. This inlet provides extremely rapid mass detection as well as a high flux of products from the electrode surface into the mass spectrometer. The impinging jet is designed in a wall-tube configuration, in which the jet diameter is large compared to the electrode diameter, thus providing uniform and rapid mass transfer conditions over the entirety of the electrode surface. This combination of rapid detection and controllable flow conditions allows a wide range of hydrodynamic conditions to be accessed with simultaneous electrochemical and mass spectrometric detection of dissolved gas species, which is important in the analysis of a range of electrochemical reactions. The capabilities of this configuration are illustrated using a platinum-coated electrode and several electrochemical reactions, including ferrocyanide oxidation, proton reduction, and oxalic acid oxidation.
Comments

This article is from Analytical Chemistry85 (2013): 6059-6065, doi:10.1021/ac400928p. Posted with permission.

Copyright Owner
American Chemical Society
Language
en
File Format
application/pdf
Citation Information
Subramanian Venkatachalam, Robert J. Angelici, L. Keith Woo and Andrew C. Hillier. "High Rate Detection of Volatile Products Using Differential Electrochemical Mass Spectrometry: Combining an Electrode-Coated Membrane with Hydrodynamic Flow in a Wall-Tube Configuration" Analytical Chemistry Vol. 85 Iss. 12 (2013) p. 6059 - 6065
Available at: http://works.bepress.com/l-woo/124/