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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/4079

Title: Automated electrodeposition of bimetallic noble-metal nanoclusters via redox-replacement reactions for electrocatalysis
Authors: Mkwizu, TS
Mathe, MK
Cukrowski, I
Keywords: Nanostructured materials
Bimetallic nanoclusters
Electrocatalysis
Noble metals
Issue Date: 2009
Citation: Mkwizu, TS, Mathe, MK and Cukrowski, I. 2009. Automated electrodeposition of bimetallic noble-metal nanoclusters via redox-replacement reactions for electrocatalysis. 215th ECS Meeting, Vol. 19(24-May 2009), San Francisco, CA, pp 97-113
Abstract: Nanoclusters of bimetallic composition involving platinum with gold or ruthenium were sequentially deposited via redoxreplacement of electrodeposited sacrificial Cu adlayers for controlling the deposition of the noble metals. These steps were repeated for a desired number of automated cycles toward: (a) stepwise increase of the size of nanostructures, and (b) stepwise synthesis of the nanostructures in relation to tuning of their electrocatalytic properties. Studies were also performed by eliminating the Cu replacement steps (direct spontaneous deposition) as well as implementing sequential codeposition of the noble-metals with simultaneous Cu redox-replacement steps. Scanning electron microscopy, energy-dispersive X-ray spectroscopy, cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy were implemented to characterize properties of the bimetallic nanoclusters with respect to morphology, elemental composition, and electrocatalytic activity for methanol oxidation. The order of electrocatalytic activity for methanol oxidation in acidic medium was (Ru|Pt) > (Au|Pt) > Pt, in line with the bifunctional mechanism.
Description: Online content of final published article downlowadable at cost at following link (DOI)http://dx.doi.org/10.1149/1.3246602
URI: http://dx.doi.org/10.1149/1.3246602
http://hdl.handle.net/10204/4079
ISSN: 1938-6737
Appears in Collections:Nanotechnology
General science, engineering & technology

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