The structure-activity relationship of Pd-Co/C electrocatalysts for oxygen reduction reaction

Yu Chen Wei, Chen Wei Liu, Yu Wei Chang, Chien Ming Lai, Pau Yee Lim, Li Duan Tsai, Kuan Wen Wang

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

The Pd-Co/C alloy catalysts with an atomic ratio of 3:1 were deposited at various pH values and reduced at different temperatures for oxygen reduction reaction (ORR). The structure-activity relationship of the prepared catalysts has been elucidated. The pH values and reduction temperatures during the preparation process affect the deposition and reduction rates of Pd and Co ions significantly, and thus the degrees of alloying, surface species, and ORR activities of the Pd-Co/C catalysts are also influenced. Due to the enhancement of Co surface segregation and the formation of Co oxide on the surface, a deterioration of ORR activity for the catalysts reduced at high temperatures and high pH values is observed. The catalysts deposited at pH value of 9 and reduced at a very low temperature of 390 K have well-formed Pd-Co alloy structure, Pd-rich surface, and excellent ORR activity.

Original languageEnglish
Pages (from-to)1864-1871
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume35
Issue number5
DOIs
StatePublished - Mar 2010

Keywords

  • Degree of alloying
  • Oxygen reduction reaction (ORR)
  • Pd-Co/C catalysts
  • pH value
  • Surface species
  • Temperature programmed reduction (TPR)

Fingerprint

Dive into the research topics of 'The structure-activity relationship of Pd-Co/C electrocatalysts for oxygen reduction reaction'. Together they form a unique fingerprint.

Cite this