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Effects of incorporation of Cu and Ag in Pd on electrochemical oxidation of methanol in alkaline solution

Prabhuram, J and Manoharan, R and Vasan, HN (1998) Effects of incorporation of Cu and Ag in Pd on electrochemical oxidation of methanol in alkaline solution. In: Journal of Applied Electrochemistry, 28 (9). pp. 935-941.

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Pd fine particles were prepared by heterogeneous reaction of PdOx with dry methanol as well as by the NaBH4 reduction method. The former method was found to give Pd nanoparticles (similar to 5 nm). Similarly f.c.c. structured, single phase nanoparticles of alloy compositions Pd0.8Cu0.2, Pd0.5Cu0.5, Pd0.8Ag0.2 and Pd0.5Ag0.5 were prepared by the heterogeneous reaction of dry methanol with intimate mixtures of PdOx + CuOx and PdOx + AgNO3. The electrochemical properties of the porous unsupported electrodes, prepared from these materials, in alkaline solutions, were investigated by cyclic voltammetry and steady-state polarization measurements. Various processes taking place during potential scanning in the presence and absence of methanol in 6 M KOH solution are discussed. Steady-state polarization data indicate that the methanol oxidation reaction (MOR) activity decreases with incorporation of Cu and Ag into the Pd lattice. The extent of decrease in the MOR activity is less for Cu addition than for Ag addition.

Item Type: Journal Article
Publication: Journal of Applied Electrochemistry
Publisher: Springer
Additional Information: Copyright of this article belongs to Springer.
Keywords: Pd electrodes;Cu and Ag incorporation;methanol oxidation; alkaline electrolyte;cyclic voltammetry;steady-state polarization.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 02 Jun 2009 10:48
Last Modified: 19 Sep 2010 05:02
URI: http://eprints.iisc.ac.in/id/eprint/18489

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