The influence of pH on reaction pathways for O2 reduction on the Au(100) face |
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Authors: | S S?trbac RR Ad?i? |
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Affiliation: | Institute of Electrochemistry, ICTM, and Center for Multidisciplinary Studies, University of Belgrade, P.O. Box 815, 11001, Belgrade, Yugoslavia |
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Abstract: | Oxygen reduction on the Au(100) face was studied by the rotating disk-ring electrode technique in solutions of anions which adsorb strongly on gold (HSO4?/SO42? and/or OH?) over the entire pH range. The specific adsorption of OH? anions, which is a pH dependent process, is found to play the key role in determining the reaction pathways. In the absence of OH? adsorption, for pHs below 6, the reduction of O2 begins as a 2e-process. Due to the increase in local pH during O2 reduction, the reaction pathway turns into a 4e-reduction at a certain potential depending on the pH of the solution. For pHs higher than 6, O2 reduction begins as a 4e-process in the potential region where specifically adsorbed OH? anions are present. |
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Keywords: | gold single crystal rotating disk-ring oxygen reduction pH reaction pathways |
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