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The influence of pH on reaction pathways for O2 reduction on the Au(100) face

✍ Scribed by S. S̆trbac; R.R. Adžić

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
460 KB
Volume
41
Category
Article
ISSN
0013-4686

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✦ Synopsis

Oxygen

reduction on the Au(lO0) face was studied by the rotating disk-ring electrode technique in solutions of anions which adsorb strongly on gold (HSO;/SO~-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 0, begins as a Ze-process. Due to the increase in local pH during 0, 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, 0, reduction begins as a C-process in the potential region where specifically adsorbed OH _ anions are present.

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