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Electrocatalysis

, Volume 10, Issue 3, pp 203–213 | Cite as

The Catalytic Activity of Pt:Ru Nanoparticles for Ethylene Glycol and Ethanol Electrooxidation in a Direct Alcohol Fuel Cell

  • Júlio César M. SilvaEmail author
  • Spyridon Ntais
  • Vishwanathan Rajaraman
  • Érico Teixeira-Neto
  • Ângela A. Teixeira-Neto
  • Almir O. Neto
  • Rodolfo M. Antoniassi
  • Estevam V. Spinacé
  • Elena A. BaranovaEmail author
Original Research
  • 107 Downloads

Abstract

In this study, we investigated the carbon-supported PtRu nanoparticles with atomic ratios of Pt:Ru of 100:0, 90:10, 70:30, and 50:50 for ethanol and ethylene glycol electrooxidation in alkaline media. The nanoparticles were synthesized using sodium borohydride method with 20 wt% of metals loading on carbon. The nanoparticle mean sizes were 7.3 nm, 5.7 nm, 5.2 nm, and 5.1 nm for Pt/C, Pt90Ru10/C, Pt70Ru30/C, and Pt50Ru50/C, respectively. X-ray diffraction (XRD) analysis revealed that Pt and PtRu electrocatalysts have face-centered cubic (fcc) structure and suggests the alloy formation for all PtRu/C materials, which was further supported by the X-ray photoelectron spectroscopy (XPS). Based on XPS analysis, Pt50Ru50/C has higher amount of Pt oxides on the surface than Pt70Ru30/C. Electrochemical results demonstrated that the addition of Ru to Pt enhances the catalytic activity towards ethanol and ethylene glycol electrooxidadion. The catalyst of Pt50Ru50/C composition showed the lowest onset potential for ethanol and ethylene glycol electrooxidation, which were 160 and 70 mV lower than for Pt/C, respectively. Furthermore, this catalyst outperformed Pt/C and other PtRu/C compositions in chronoamperometric and direct alcohol fuel cell (DAFC) experiments. DAFC experiments using Pt50Ru50/C as anode had the power density 40 and 14% higher than using Pt/C for ethanol and ethylene glycol, respectively. The promotion is due to the bi-functional mechanism and/or electronic effect of two metals in the alloy.

Keywords

PtRu nanoparticles Ethanol Ethylene glycol Direct alcohol fuel cell Electronic effect 

Notes

Acknowledgments

The authors wish to thank FAPESP (Proc. no 2014/09087-4, 2014/09868-6) and CAPES for the financial support. Use of TEM facilities (JEOL JEM-2100F) of LNNano-CNPEM is greatly acknowledged.

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Authors and Affiliations

  1. 1.Grupo de Eletroquímica e Materiais Nanoestruturados, Campus ValonguinhoInstituto de Química da Universidade Federal FluminenseNiteróiBrazil
  2. 2.Department of Chemical and Biological Engineering, Centre for Catalysis Research and Innovation (CCRI)University of OttawaOttawaCanada
  3. 3.Brazilian Nanotechnology National LaboratoryBrazilian Center for Research in Energy and MaterialsCampinasBrazil
  4. 4.Instituto de Pesquisas Energéticas e NuclearesSão PauloBrazil

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