Study of Pd-Au/MWCNTs formic acid electrooxidation catalysts

Anna Mikolajczuk, Andrzej Borodzinski, Leszek Stobinski, Piotr Kedzierzawski, Beata Lesiak, László Kövér, József Tóth, Hong Ming Lin

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11 Citations (Scopus)

Abstract

The Pd-Au multiwall carbon nanotubes (MWCNTs) supported catalyst exhibits higher power density in direct formic acid fuel cell (DFAFC) than similar Pd/MWCNTs catalyst. The Pd-Au/MWCNTs catalyst also exhibits higher activity and is more stable in electrooxidation reaction of formic acid during cyclic voltammetry (CV) measurements. After preparation by polyol method, the catalyst was subjected to two type of treatments: (I) annealing at 250 °C in 100% of Ar, (II) reducing in 5% of H2 in Ar atmosphere at 200 °C. It was observed that the catalyst after treatment I was completely inactive, whereas after treatment II exhibited high activity.In order to explain this effect the catalysts were characterized by electron spectroscopy methods. The higher initial catalytic activity of Pd-Au/MWCNTs catalyst than Pd/MWCNTs catalyst in reaction of formic acid electrooxidation was attributed to electronic effect of gold in Pd-Au solution, and larger content of small Au nanoparticles of 1 nm size. The catalytic inactivity of Pd-Au/MWCNTs catalysts annealed in argon is attributed to carbon amorphous overlayer covering of Pd oxide shell on the metallic nanoparticles.

Original languageEnglish
Pages (from-to)2717-2721
Number of pages5
JournalPhysica Status Solidi (B) Basic Research
Volume247
Issue number11-12
DOIs
Publication statusPublished - Dec 1 2010

Keywords

  • Au-Pd/MWCNTs catalysts
  • Electron spectroscopy methods
  • Electrooxidation reaction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Mikolajczuk, A., Borodzinski, A., Stobinski, L., Kedzierzawski, P., Lesiak, B., Kövér, L., Tóth, J., & Lin, H. M. (2010). Study of Pd-Au/MWCNTs formic acid electrooxidation catalysts. Physica Status Solidi (B) Basic Research, 247(11-12), 2717-2721. https://doi.org/10.1002/pssb.201000271