Journal of Applied Electrochemistry

, Volume 48, Issue 6, pp 675–689 | Cite as

Pd–Zn/C bimetallic electrocatalysts for oxygen reduction reaction

  • Georgios Bampos
  • Dimitris I. Kondarides
  • Symeon Bebelis
Research Article


A series of eight 10 wt% Pd–Zn/C electrocatalysts were synthesized via wet impregnation and compared concerning their activity for the oxygen reduction reaction (ORR) in 0.1 M HClO4 and room temperature, using the thin-film rotating disk electrode technique. The electrocatalysts differed in Pd:Zn mass ratio and reduction temperature. Pt/C, Pd/C and Zn/C electrocatalysts of 10 wt% metal loading, also prepared via wet impregnation and reduced at 300 °C, were used as reference. The highest activity among the Pd–Zn/C, Pd/C and Zn/C electrocatalyts was exhibited by Pd–Zn/C reduced at 300 °C and with a Pd:Zn mass ratio equal to 3:1. Its specific activity was higher than that of 10 wt% Pt/C (by ca. 3.5 times at 0.5 V vs. Ag/AgCl), whereas their mass activities were similar. On the contrary, the ORR specific activity of a 29 wt% Pd–Zn/C electrocatalyst reduced at 300 °C and with Pd:Zn mass ratio 3:1 was lower than that of a 29 wt% Pt/C electrocatalyst prepared in the same manner, by ca. 3.7 times at 0.5 V vs. Ag/AgCl, although their mass activities were similar above this potential. Both these catalysts were clearly less active than a commercial (TKK) 29 wt% Pt/C electrocatalyst.

Graphical Abstract


Oxygen reduction reaction ORR Pd–Zn electrocatalysts Pd-based electrocatalysts Rotating disk electrode PEMFC 



The assistance of Professor P.G. Koutsoukos and Ms P. Natsi, Chemical Engineer, with BET measurements is gratefully acknowledged.

Supplementary material

10800_2018_1199_MOESM1_ESM.pdf (1.8 mb)
Supplementary material 1 (PDF 1793 KB)


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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Chemical EngineeringUniversity of PatrasPatrasGreece

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