fulltext.study @t Gmail

Preparation of carbon-supported Pt–Pd electrocatalysts with improved physical properties using electroless deposition methods

Paper ID Volume ID Publish Year Pages File Format Full-Text
48137 46494 2009 9 PDF Available
Title
Preparation of carbon-supported Pt–Pd electrocatalysts with improved physical properties using electroless deposition methods
Abstract

Surface modification of a carbon support preceding deposition of catalytic Pd seed nuclei has been used to prepare Pt–Pd catalysts by the electroless deposition (ED) of Pt (onto the Pd surface) from a solution containing PtCl62− and dimethylamine borane reducing agent. Functionalization of a carbon support with nitric acid to form surface carboxylic acid groups is followed by pre-treatment in a pH 14 bath to convert the acid moieties to the corresponding carboxylate (RCOO−) groups. The negative surface charge results in an electrostatic attraction between the carboxylate groups and positively charged Pd2+ cations during wet impregnation to produce smaller catalytic Pd seed nuclei which act as deposition sites for Pt in the ED process. Analysis by TEM after Pt deposition indicated the Pt–Pd particle sizes were smaller and had a more narrow size distribution than a series of Pt–Rh/C catalysts prepared earlier in which there had been no such modification of the carbon surface [K.D. Beard, M.T. Schaal, J.W. Van Zee, J.R. Monnier, Applied Catalysis B: Environmental 72 (2007) 262]. Cyclic voltammetry experiments indicated the Pt–Pd/C catalysts have different (bi)sulfate anion adsorption properties than conventional Pt/C electrocatalysts, suggesting a possible change in the d-band electronic structure of the surface atoms. However, oxygen reduction activity of Pt–Pd/C is only comparable to that of the Pt/C catalyst. Regardless, the results have implications for using ED methods to decrease the amount of Pt used for the oxygen electrode in low temperature fuel cells.

Keywords
Bimetallic catalysts; Electroless deposition; Oxygen reduction; Platinum; Palladium; Fuel cells
First Page Preview
Preparation of carbon-supported Pt–Pd electrocatalysts with improved physical properties using electroless deposition methods
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 88, Issues 1–2, 29 April 2009, Pages 185–193
Authors
, , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us