Influence of thermal treatments on the stability of Pd nanoparticles supported on graphitised ordered mesoporous carbons

Veronica Celorrio, David Sebastian, Laura Calvillo, Garcia Ana Beatriz, David Fermin, M. J. Lazaro

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

9 Citations (Scopus)
266 Downloads (Pure)

Abstract

The graphitisation of ordered mesoporous carbons (CMK-3) was carried out by thermal treatments under different conditions of temperature and heating rate. The electrochemical characterization in acidic medium of the graphitised CMK-3 showed that such a thermal treatment is effective to decrease the carbon oxidation rate (corrosion) while preserving a good porosity in terms of capacitance. Besides, the graphitisation degree and, in consequence, the electrochemical corrosion resistance can be modulated by an appropriate choice of thermal treatment conditions, where the heating rate and temperature appear as critical parameters. Under certain graphitisation conditions, the carbon corrosion of CMK-3 can be minimized showing lower rates compared to a commercial carbon black (Vulcan). Palladium nanoparticles were supported on the most promising graphitised CMK-3 and Vulcan using a method based on impregnation and reduction with borohydride, resulting in suitable metal crystallite sizes. The electrocatalytic activity towards the oxidation of carbon monoxide and formic acid were assessed in aqueous sulphuric acid electrolyte for application at the anode of direct formic acid fuel cells (DFAFCs). The best activity results were obtained for the Pd catalyst supported on a graphitised CMK-3.
Original languageEnglish
Pages (from-to)19570–19578
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume41
Issue number43
Early online date16 Jun 2016
DOIs
Publication statusPublished - 16 Nov 2016

Keywords

  • ordered mesoporous carbon
  • graphitisation
  • corrosion
  • palladium
  • direct formic acid fuel cells

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