Electroreduction of oxygen on gold-supported nanostructured palladium films in acid solutions

The electrochemical reduction of oxygen on thin Pd films with a nominal thickness of 0.25–10 nm on polycrystalline Au substrate (Pd/Au) was studied. The Pd films were prepared by electron beam evaporation and oxygen reduction was studied in 0.1 M HClO 4 and 0.05 M H 2SO 4 solutions using the rotatin...

Full description

Saved in:

Bibliographic Details
Published in:	Electrochimica acta Vol. 55; no. 22; pp. 6768 - 6774
Main Authors:	Sarapuu, Ave, Kasikov, Aarne, Wong, Naomi, Lucas, Chris A., Sedghi, Gita, Nichols, Richard J., Tammeveski, Kaido
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01-09-2010 Elsevier
Subjects:	Chemistry Density Electrocatalysis Electrochemistry Electrodes Exact sciences and technology Film thickness General and physical chemistry Gold Gold support Kinetics and mechanism of reactions Nanostructure Oxygen reduction Palladium Palladium film Reduction Scanning tunneling microscopy Scanning tunnelling microscopy Oxygen reduction Electrocatalysis Gold support Scanning tunnelling microscopy Palladium film Electron beam deposition Acidic solution Sulfuric acid Surface structure Electrodes Chemical reduction Scanning tunneling microscopy Electrochemical reaction Platinoid Modified material Gold Oxygen Transition metal Nanostructure Palladium Thickness Perchloric acid Morphology Kinetics Nanostructured materials Electron beam evaporation
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	The electrochemical reduction of oxygen on thin Pd films with a nominal thickness of 0.25–10 nm on polycrystalline Au substrate (Pd/Au) was studied. The Pd films were prepared by electron beam evaporation and oxygen reduction was studied in 0.1 M HClO 4 and 0.05 M H 2SO 4 solutions using the rotating disk electrode (RDE) method. The surface morphology of Pd overlayers was examined by scanning tunnelling microscopy (STM). O 2 reduction predominantly proceeds through 4e − pathway on all Pd/Au electrodes. The specific activity (SA) of oxygen reduction was lower in H 2SO 4 solution and decreased slightly with decreasing the Pd film thickness. In HClO 4, the SA was higher and not significantly dependent on the film thickness. The Tafel slope values close to −60 mV at low current densities and −120 mV at high current densities were found for all electrodes.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0013-4686 1873-3859
DOI:	10.1016/j.electacta.2010.05.092