Enhancement of electrochemical properties of Pd/C catalysts toward ethanol oxidation reaction in alkaline solution through Ni and Au alloying

Pai Cheng Su, Hong Shuo Chen, Tsan Yao Chen, Chen Wei Liu, Chih Hao Lee, Jyh Fu Lee, Ting Shan Chan, Kuan Wen Wang

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

The effect of Au and/or Ni addition on the ethanol oxidation reaction (EOR) performance in alkaline media of Pd-based binary and ternary catalysts (Pd 3Au/C, Pd3Ni/C, and Pd3AuNi/C) is systematically elucidated. The EOR activities, structures, morphologies, surface compositions and surface species of the prepared catalysts are analyzed by cyclic voltammetry, X-ray diffraction and X-ray absorption spectroscopy, high resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and temperature-programmed reduction, respectively. It is observed that the surface Ni with the chemical state of NiOOH can promote the EOR through bi-functional mechanism and spillover while surface Au can modify the Pd lattice and electron configuration which is helpful for the absorption of ethanol molecular. Chronoamperometric (CA) results obtained at room temperature demonstrate that the mass current density of ternary Pd3AuNi/C catalysts after the long-term EOR test for 4 h is about 1.39 and 1.10 times higher than that of the monometallic Pd/C and binary Pd3Au/C catalysts, respectively. It is proposed that the EOR stability enhancement of Pd3AuNi can be attributed to the synergistic effect of Ni and Au alloying.

Original languageEnglish
Pages (from-to)4474-4482
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number11
DOIs
StatePublished - 15 Apr 2013

Keywords

  • Alkaline solution
  • Ethanol oxidation reaction (EOR)
  • Long-term stability
  • PdAuNi catalysts
  • Temperature-programmed reduction (TPR)
  • X-ray absorption spectroscopy (XAS)

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