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Electrocatalysis

, Volume 9, Issue 5, pp 582–592 | Cite as

Pt-Ru-NiTiO3 Nanoparticles Dispersed on Vulcan as High Performance Electrocatalysts for the Methanol Oxidation Reaction (MOR)

  • Velumani Thiagarajan
  • Palaniswamy Karthikeyan
  • Ramasamy Manoharan
  • Srinivasan Sampath
  • A. Hernández-Ramírez
  • M.E. Sánchez-Castro
  • I.L. Alonso-Lemus
  • F.J. Rodríguez-Varela
Original Research

Abstract

We propose a high performance electrocatalyst based on Pt-Ru-NiTiO3 nanoparticles supported on Vulcan carbon (Pt-Ru-NiTiO3/C) for the methanol oxidation reaction (MOR) in acid medium. The electrocatalyst is prepared from a two-step procedure using a wet chemical method. The morphological studies from TEM indicate that Pt-Ru-NiTiO3 nanoparticles are uniformly distributed on Vulcan carbon. The XRD shows the fcc structure of Pt nanomaterials, while the chemical composition examined using XPS indicates the presence of large fractions of Pt0 and Ru0 species (i.e., metallic state), OH and O2− species are also formed on the surface of the catalyst. The Pt-Ru-NiTiO3/C electrocatalyst exhibits a higher catalytic activity compared to a PtRu/C alloy. Pt-NiTiO3/C is also more active than the alloy. Therefore, on one side, the addition of Ru enhances the MOR through the formation of oxygenated adsorbed species on Ru, which thereby promotes the oxidation of CO to CO2 at more negative potentials (i.e., the bifunctional mechanism). On the other hand, the superior electrocatalytic performance of Pt-Ru-NiTiO3/C is attributed also to the synergistic effects of NiTiO3, which promotes the reaction increasing the current density and shifting the onset potential to even more negative values, suggesting that it also participates in the bifunctional mechanism along with Ru. From the results shown here, Pt-Ru-NiTiO3/C can be a promising anode nanomaterial for direct methanol fuel cells (DMFCs).

Graphical Abstract

Keywords

Pt-Ru alloys XPS characterization Methanol oxidation reaction Electrocatalysts Direct methanol fuel cells 

Notes

Acknowledgements

We thank Prof. N. Munichandraiah and Prof. G. Mohan Rao of the Indian Institute of Science, Bengaluru, for their help rendered in the XPS analysis.

Funding Information

We gratefully acknowledge DST (Nano Mission-SR/NM/NS-1016/2010) and DST-CONACYT (Indo-Mexican Bilateral programme-INT/MEXICO/P14/2012 and grant 252079) for the financial support. This work was also funded through the Project 241526 from CONACYT.

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Velumani Thiagarajan
    • 1
  • Palaniswamy Karthikeyan
    • 1
  • Ramasamy Manoharan
    • 2
  • Srinivasan Sampath
    • 3
  • A. Hernández-Ramírez
    • 4
  • M.E. Sánchez-Castro
    • 4
    • 5
  • I.L. Alonso-Lemus
    • 6
  • F.J. Rodríguez-Varela
    • 4
    • 5
  1. 1.Department of Automobile EngineeringPSG College of TechnologyCoimbatoreIndia
  2. 2.TiruchirappalliIndia
  3. 3.Department of Inorganic and Physical ChemistryIndian Institute of ScienceBengaluruIndia
  4. 4.Programa de Nanociencias y NanotecnologíaCinvestav Unidad SaltilloRamos ArizpeMexico
  5. 5.Grupo de Sustentabilidad de los Recursos Naturales y EnergíaCinvestav Unidad SaltilloRamos ArizpeMexico
  6. 6.CONACYT, Grupo de Sustentabilidad de los Recursos Naturales y EnergíaCinvestav Unidad SaltilloRamos ArizpeMexico

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