A New Approach for Simultaneous DEMS and EQCM: Electro‐oxidation of Adsorbed CO on Pt and Pt‐Ru

Abstract

The combination of differential electrochemical mass spectrometry (DEMS) and electrochemical quartz crystal microbalance (EQCM) is possible by means of a new dual thin layer cell. Thus, simultaneous real‐time measurements of volatile products and deposited (or dissolved) species can be performed, which is demonstrated for CO‐adsorption and desorption processes on Pt and a Pt‐Ru alloy in sulfuric acid. In particular, it is shown that on a Pt‐Ru alloy, electrode anions are adsorbed even at 0 mV vs. reversible hydrogen electrode. © 1999 The Electrochemical Society. All rights reserved.