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Dispersion effect in formic acid oxidation on PtAu/C nanocatalyst prepared by water-in-oil microemulsion method

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2019
10.1016@j.apcatb.2018.10.064.pdf (696.4Kb)
Authors
Krstajić Pajić, Mila N.
Stevanović, Sanja
Radmilović, Vuk V.
Gavrilović-Wohlmuther, Aleksandra
Zabinski, Piotr
Elezović, Nevenka R.
Radmilović, Velimir R.
Gojković, Snežana Lj.
Jovanović, Vladislava M.
Article (Accepted Version)
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Abstract
Low loading PtAu nanoparticles supported on high area carbon were synthesized by water-in-oil microemulsion method and examined for formic acid and methanol oxidation. Prepared catalyst powder was characterized by Xray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). These techniques revealed that the catalyst contains rather agglomerated quasi-spherical particles, similar to 4 nm diameter, composed of a solid solution of Pt and Au with only similar to 4 at% of Au. In spite of such low Au content, both onset and peak potentials for CO oxidation are shifted some 150 mV to more positive values in comparison to Pt synthesized in the same manner due to stronger binding of CO as a result of notable electronic effect. It is important that this small quantity of Au also significantly influences oxidation of formic acid promoting direct path and suppressing indirect path in formic acid oxidation in... a degree as expected by a much larger quantity of Au. Such improvement could be due exclusively by ensemble effect of high number of small Pt domains which formation could be possible only by very fine dispersion of such low Au quantity. High number of small Pt domains is corroborated by lower activity for methanol oxidation in comparison to Pt catalyst synthesized by the same procedure. These results emphasize the importance of the Au dispersion on the surface of Pt over its quantity in PtAu catalyst with regards to both, the ensemble and the electronic effects.

Keywords:
PtAu nanoparticles / Microemulsion method / Formic acid electrooxidation / Methanol electrooxidation
Source:
Applied Catalysis B-Environmental, 2019, 243, 585-593
Publisher:
  • Amsterdam : Elsevier Science Bv
Projects:
  • New approach in designing materials for energy conversion and energy storage systems (RS-172060)
  • Serbian Academy of Sciences and Arts - F-141
  • COST Action - COST-STSM-MP1407-35830
  • COST Action - COST-STSM-MP1407-35830
Note:
  • http://cer.ihtm.bg.ac.rs/handle/123456789/2490

DOI: 10.1016/j.apcatb.2018.10.064

ISSN: 0926-3373

WoS: 000453616800060

Scopus: 2-s2.0-85056487106
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/2897
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