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



  history
ID: 192045.0, Fritz-Haber-Institut / Physical Chemistry
Autocatalysis by the intermediate surface hydroxide formed during H2O2 reduction on Ag(111) electrodes
Authors:Danckwerts, Matthias; Horswell, Sarah L.; Pettinger, Bruno; Savinova, Elena R.; Weil, Konrad G.; Doblhofer, Karl
Language:English
Publisher:The Electrochemical Society Inc.
Place of Publication:Pennington, NJ 08534-2839, USA
Date of Publication (YYYY-MM-DD):2004
Title of Proceedings:Surface Oxide Films
Start Page:151
End Page:159
Title of Series:Proceedings Volumes
Volume (in Series):2003-25
Corporate Body ed. Series:The Electrochemical Society Inc.
Physical Description:360 pages
Name of Conference/Meeting:International Symposium on Surface Oxide Films held at the 204th Electrochemical-Society Meeting
Place of Conference/Meeting:Orlando, FL, USA
(Start) Date of Conference/Meeting
 (YYYY-MM-DD):
2003-10-12
End Date of Conference/Meeting 
 (YYYY-MM-DD):
2003-10-17
Copyright:© The Electrochemical Society Inc., Pennington, NJ 08534-2839, USA
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The cathodic hydrogen peroxide, H2O2, reduction in HClO4 proceeds by two parallel mechanisms, the “normal” H2O2 reduction, and a remarkable autocatalytic reaction path. Chemisorbed hydroxyl groups OHad, formed as an intermediate on the silver electrode, are considered to constitute the autocatalytically active species. In order to obtain a clearer conception of the species OHad, the state of Ag(111) electrodes in inert electrolytes of varying pH is analysed with electrochemical and surface science tech-niques. Experiments with Second Harmonic Generation yield particularly valuable results. The surface studies, along with numerical simulations of the adsorption dynamics, indicate that the species OHad is identical with the discharged surface hydroxyl species formed as a relatively stable intermediate in the anodic oxidation of OH- to surface-Ag2O.
Free Keywords:Single-crystal electrode; Hyrogen-peroxide; Oxygen reduction; Ag electrodes; Silver; Mechanism, Interface; Oxidation; Behavior; Platinum; Electrocatalysis; Ag(111); surface reaction; hydrogen peroxide; adsorption; activation; second harmonic generation
External Publication Status:published
Document Type:Conference-Paper
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Danckwerts M, Freie Universität Berlin, Abt. Physik, D-14195 Berlin;
Savinova ER, Technische Universität München, Physik Dept. E 19, D-85748 Garching, Germany
Identifiers:ISBN:1.56677-410-1
URL:http://www.electrochem.org/publications/pv/publish...
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