Methanol tolerant Pt2CrCo catalysts supported on ordered mesoporous carbon for the cathode of DMFC

Luis Miguel Rivera Gavidia, Gonzalo Garcia, Veronica Celorrio, M. J. Lazaro, Elena Pastor

Research output: Contribution to journalArticle (Academic Journal)peer-review

9 Citations (Scopus)
252 Downloads (Pure)

Abstract

Graphitized ordered mesoporous carbon CMK-3-R8 supported Pt2CrCo electrocatalysts were synthetized by the borohydride reduction method (BM) and then submitted to a reductive thermal treatment (TT) at 300, 500 and 700 °C with the aim to improve their catalytic activity toward the oxygen reduction reaction (ORR) and the methanol tolerance. Atomic composition and total metal loading were determined by energy dispersive X-ray (EDX) analysis and the values obtained were close to the nominal ones, i.e. 20 wt.% Pt2CrCO/CMK-3. Electrochemical measurements were carried out using rotating disk electrode (RDE) technique in oxygen-saturated sulfuric acid solution in absence and presence of dissolved methanol. Besides other species and parameters, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis revealed the formation of an ordered Pt3Cr alloy phase and the surface enrichment by Cr2O3 species with the rise of the annealing temperature. The last, in conjunction with the absence of Pt sites with (110) orientation, enhances the catalytic activity toward the ORR and the methanol tolerance. Kinetic parameters are reported and analyzed in terms of the physicochemical properties of the catalysts obtained by the X-ray techniques.
Original languageEnglish
Pages (from-to)19645-19655
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume41
Issue number43
Early online date1 Jul 2016
DOIs
Publication statusPublished - 16 Nov 2016

Keywords

  • ORR
  • DMFC
  • Methanol tolerance
  • Thermal treatment
  • PtCrCo alloys
  • Graphitized ordered mesoporous carbon

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