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Pd black decorated by Pt sub-monolayers as an electrocatalyst for the HCOOH oxidation

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2014
Authors
Obradović, Maja
Gojković, Snežana Lj.
Article (Published version)
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Abstract
Pd black was modified by a very low amount of Pt corresponding to a sub-monolayer (ML). Spontaneous displacement method was employed. The catalysts with 0.02-0.12 ML were characterized by cyclic voltammetry and COads stripping and were tested for HCOOH oxidation under the potentiodynamic and potentiostatic conditions. All the Pt"Pd catalysts were more active for HCOOH oxidation than Pd black. The Pt"Pd with 0.08 ML of Pt exhibited the highest activity with the maximum current density under the potentiodynamic conditions of 8 mA cm(-2) (vs. 2.7 mA cm(-2) on Pd black). Contrasting HCOOH oxidation kinetics on Pt"Pd and Pt"Au catalysts revealed that the current densities are higher, and the poisoning rate is lower on Pt"Pd catalyst. This was ascribed to an optimal strength of the Pt-adsorbate bond when Pt is supported on Pd and to a possible influence of the Pt atoms on the Pd substrate.
Keywords:
Formic acid / Palladium / Platinum / Gold / Electrochemical oxidation / Fuel cell
Source:
Journal of Solid State Electrochemistry, 2014, 18, 9, 2599-2607
Publisher:
  • Springer, New York
Projects:
  • Development, characterization and application nanostructured and composite electrocatalysts and interactive supports for fuel cells and water electrolysis (RS-172054)

DOI: 10.1007/s10008-014-2509-9

ISSN: 1432-8488

WoS: 000341097000030

Scopus: 2-s2.0-84906778469
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/1420
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