4th INTERNATIONAL WORKSHOP ON ELECTRODEPOSITED NANOSTRUCTURES 16-18 March 2006, Dresden, Germany	ABSTRACTS

ELECTRODEPOSITION OF NANO- AND MICROCRYSTALLINE PALLADIUM FROM IONIC LIQUIDS Reinhard Böck FEM - Forschungsinstitut für Edelmetalle und Metallchemie Abt. Electrochemie Katharinenstrasse 17, 73525 Schwäbisch Gmünd, Germany E-mail: Boeck@fem-online.de Palladium is one of the most important metals for industrial applications such as electrical contact and catalysis because of its excellent wear resistance, good solderability and high catalytic activity for various chemical reactions. Among the various methods for the preparation of Pd and Pd alloy coatings, electrodeposition is an economical and convenient choice because electrodepositon can be performed at ambient pressure, requiring relatively inexpensive equipment. Furthermore, plating on odd-shaped surface is possible and controlling of the thickness, composition and morphologies of the deposits is possible. However, Pd electrodeposition process from aqueous baths suffer from the codeposition of hydrogen, e.g. leading to the formation of microcracks. The room-temperature ionic liquids represent a class of solvents that are interesting for applications in catalysis and nanotechnology. For electrochemical applications, the ionic liquids exhibit several advantages over conventional molecular solvents, e.g. the ionic liquids are thermally stable over a wide temperature range and have a good conductivity. In this study, the nano- and microcrystalline electrodeposition of palladium from a Lewis basic 1-buthyl-3-methyl-imidazolium chloride tetrafluoroborate melt (BMI-Cl-BF4) was investigated. The effects of deposition current, depositon temperature on the morphology of the electrodeposits was examined. The surface morphology of the electrodeposits was characterized by a scanning electron microscope (SEM) and the crystalline phases of the deposis were studied with an X-ray diffractometer (XRD). The resutls show that it is possible to deposit nanocrystalline Pd on several substrates, for example open cell metallic foams as catalyst carrier, from a BMI-Cl-BF4 - PdCl2 system.

 
 
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