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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Electrochemical preparation of a Au crystal with peculiar morphology and unique growth orientation and its catalysis for oxygen reduction
Journal of the Electrochemical Society, Volume 152, No. 6, Year 2005
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Description
Gold nanocrystals with a peculiar pin-like morphology have been obtained on glassy carbon (GC) electrodes by electrochemical deposition from 0.5 M H 2SO 4 solution containing 1.0 mM Na[AuCl 2] in the presence of cysteine as an additive. The amount of such electrodeposited Au particles as well as the panicle size increased with the increase of deposition time (t d). Crystalline facets of Au(100) and Au(110) were significantly enriched in the presence of cysteine during the electrodeposition, and the Au crystals grew along a unique crystalline orientation of Au(111). Finally, Au crystals (with the average diameter of ca. 100 nm and length of ca. 1660 nm at t d = 2000 s) with a peculiar pin-like morphology were obtained, in contrast to the plump Au particles prepared in the absence of cysteine. The cathodic peak current density for the O 2 reduction in acidic electrolyte (0.5 M H 2SO 4) at the Au crystals-electrodeposited GC electrode prepared in the presence of cysteine was larger than that at the electrode prepared in its absence. This behavior could be reasonably explained in view of the higher specific surface area of the Au crystals prepared in the presence of cysteine than those prepared in the absence of cysteine. © 2005 The Electrochemical Society. All rights reserved.
Authors & Co-Authors
Gao, Feifei
Japan, Tokyo
Tokyo Institute of Technology
Japan, Tokyo
The University of Tokyo
Japan, Kawaguchi
Japan Science and Technology Agency
El-Deab, Mohamed S.
Japan, Tokyo
Tokyo Institute of Technology
Egypt, Giza
Faculty of Science
Okajima, Takeyoshi
Japan, Tokyo
Tokyo Institute of Technology
Ohsaka, Takeo
Japan, Tokyo
Tokyo Institute of Technology
Statistics
Citations: 45
Authors: 4
Affiliations: 4
Identifiers
Doi:
10.1149/1.1906023
ISSN:
00134651
Research Areas
Environmental