Synergistic effect of Co alloying and surface oxidation on oxygen reduction reaction performance for the Pd electrocatalysts

Yu Chen Wei, Chen Wei Liu, Hung Wen Lee, Shu Ru Chung, Sheng Long Lee, Ting Shan Chan, Jyh Fu Lee, Kuan Wen Wang

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


The synergistic effect of Co alloying and oxidation treatment induced progressive enhancement on oxygen reduction reaction (ORR) activities of Pd/C catalysts is studied. Based on the XPS characterization, a new term, degree of surface oxidation (DSO), is proposed to illustrate their relationship between ORR activity and surface oxidation extent. TPR characterization also provides the evolution of surface species within the topmost region. It can be obviously found the optimal temperature for the promotion of ORR activity on various oxidized samples is 520 K. On the other hand, various heat treatment atmospheres (H2 and CO) are applied on Pd-Co system without changing their particle size. It is clearly evident that the oxidized catalysts can exhibit the superior performance relative to that of the non-oxidized ones, confirming the improved ORR activity is solely ascribed to the formation of surface PdO species with 100% DSO value rather than large particle size effect. Moreover, an explainable model is demonstrated to illustrate the promotional effect of ORR performance on the oxidized PdCo/C catalysts.

Original languageEnglish
Pages (from-to)3789-3802
Number of pages14
JournalInternational Journal of Hydrogen Energy
Issue number6
StatePublished - Mar 2011


  • Degree of surface oxidation (DSO)
  • Oxidation treatment
  • Oxygen reduction reaction (ORR)
  • PdCo/C
  • PdO
  • Temperature-programmed reduction (TPR)


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