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Effects of composition on structure and activity of PtRu/C catalysts

DOI: 10.1039/b819418a DOI Help

Authors: M. P. Hogarth (Johnson Matthey) , C. R. King (University of Southampton) , P. P. Wells (University of Southampton) , H. Davies (Johnson Matthey) , A. Rose (University of Southampton) , D. Thompsett (Johnson Matthey) , B. Theobald (Johnson Matthey) , M. Roberts (STFC Daresbury Laboratory) , A. E. Russell (University of Southampton) , F. W. Mosselmans (Diamond Light Source) , R. J. K. Wiltshire (University of Southampton)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Physical Chemistry And Chemical Physics , VOL 11 (13) , PAGES 2305 - 2313

State: Published (Approved)
Published: January 2009

Abstract: A series of carbon supported PtRu bimetallic catalysts with varying Pt:Ru ratio were prepared and characterised using ex situ and in situXRD, in situ EXAFS at 0 V vs.RHE, ex situ XPS and monolayer CO stripping voltammetry. Although the catalysts were found to be well mixed/alloyed, with no evidence of unalloyed Ru (oxides) present, the surfaces of the electrocatalyst nanoparticles were found to be enriched with Pt compared to the nominal bulk composition. The methanol oxidation activities of the catalysts were determined in 1.0 mol dm−3 H2SO4. In agreement with published studies of polycrystalline bulk PtRu alloys the catalyst with a 0.6 surface fraction of Pt was found to give the best methanol oxidation activity at 30 °C. However, at 80 °C a greater surface fraction of Ru could be tolerated, with some activity at low current densities found for a Pt surface fraction as low as 0.2. The results support the conclusion that a limited amount of methanol dehydrogenation occurs at Ru sites or Ru dominated surface ensembles at 80 °C.

Subject Areas: Chemistry, Materials


Instruments: NONE-No attached Diamond beamline