Journal
ELECTROCHIMICA ACTA
Volume 52, Issue 13, Pages 4581-4588Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2006.12.071
Keywords
electrocatalysis; gold; oxygen reduction reaction; rotating disk electrode; titanium dioxide
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From aqueous solutions, gold was deposited on freshly polished titanium surface either by displacement reaction or by potentiodynamic polarization. Both of these procedures resulted in the formation of Au/TiO2 composite layer over the titanium surface, although with quite different Au content. The electrochemical behaviour of these composite layers was examined in 0.1 M NaOH solution, both oxygen free and oxygen saturated, using rotating disc technique. In the potential region of oxygen reduction reaction, the Au/TiO2 layer obtained by potentiodynamic polarization, displayed the voltammetric curve similar to that observed on (10 0) plane of Au monocrystal. The Koutecky-Levich analysis evidenced that 4e(-) route of oxygen reduction dominates on both type of composite layers. (c) 2007 Elsevier Ltd. All rights reserved.
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