Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 13, Issue 8, Pages 852-855Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2011.05.020
Keywords
Pt/Au; Active sites; Electrocatalysis
Categories
Funding
- Australian Research Council [DP110105125]
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In this work it is demonstrated that Pt electrodes can be activated by cathodic polarisation in the hydrogen evolution region which makes it prone to oxidation at potentials below that of bulk oxide formation. When an activated Pt electrode is placed in an aqueous HAuCl4 solution the electroless deposition of Au onto the surface of the electrode is observed and confirmed by cyclic voltammetry and XPS measurements. It is demonstrated that the oxidation of active Pt surface atoms provides the driving force for the spontaneous reduction of Au3+ ions into metallic Au to generate a Pt/Au surface which is highly active for the electro-oxidation of ethanol. (C) 2011 Elsevier B.V. All rights reserved.
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