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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents

ID: 42750.0, Fritz-Haber-Institut / Physical Chemistry
Surface properties of Ru(0001) electrodes interacting with formic acid
Authors:Lei, Ting; Lee, Jaeyoung; Zei, Mau-Scheng; Ertl, Gerhard
Date of Publication (YYYY-MM-DD):2003-09-15
Title of Journal:Journal of Electroanalytical Chemistry
Journal Abbrev.:J. Electroanal. Chem.
Start Page:41
End Page:48
Title of Issue:Special issue in memory of Professor M.J. Weaver
Full name of Issue-Editor(s):Wieckowski, Andrzej
Copyright:© Elsevier Science B.V. All rights reserved.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Cyclic voltammetry (CV) was used to investigate the electrocatalytic oxidation of formic acid on smooth and rough Ru(0001) electrodes in HClO4 solution. Ex-situ electron diffraction (LEED and RHEED) and Auger electron spectroscopy (AES) were applied to characterize the Ru electrode surfaces and the adsorbate structure. The CV for a smooth Ru(0001) surface in a 0.1 M HCOOH+0.1 M HClO4 solution no longer exhibits the H- and OH-adsorption peaks in the double layer region due to complete blocking of H/OH-adsorption by COad species, as has been confirmed by the observation of an ordered (2x2)-CO phase in good agreement with in-situ IR measurements. We find that the major pathway for HCOOH oxidation is via dehydration at electrode potentials below 0 V involving no faradaic current formation in agreement with the literature, since no anodic current peak occurs in this potential region. An anodic current peak appears at 0.6 V, which is ascribed to COad electrooxidation with concomitant O/OH adsorption as confirmed by a (1x1)-O phase and an increase in the Auger O-signal, which causes inhibition of HCOOH adsorption and decomposition leading to deceleration of formic acid oxidation at higher potentials, E > 0.7 V.
Free Keywords:Ruthenium single crystal; Electrocatalysis; Ex-situ LEED/RHEED
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
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