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The Role of Surface Functionalities in PtGe and PtIn Catalysts for Direct Methanol Fuel Cells

  • Natalia S. Veizaga
  • Virginia I. Rodriguez
  • Mariano Bruno
  • Sergio R. de Miguel
Original Research
  • 49 Downloads

Abstract

Bimetallic PtGe and PtIn catalysts were prepared over Vulcan carbon (VC) and multiwall carbon nanotubes (NT) by conventional impregnation method (CI). These supports were functionalized with citric or nitric acid. The structural and electrochemical characteristics of the different functionalized supported catalysts were analyzed in order to determine the influence of the functional groups. The methods applied were temperature programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS), cyclohexane dehydrogenation reaction (CHD), and CO stripping. The functionalization treatment with citric or nitric acid eases CO oxidation to CO2, decreasing poisoning effect of CO over Pt, due to the development of oxygenated groups on support surfaces and in the nearby Ge and In. Bimetallic catalysts supported on carbons functionalized with HNO3 present increasing electrochemical active surface values, indicating a better electrochemical behavior than the corresponding monometallic catalysts. DMFC experiments show a very good behavior of PtGe catalysts, mainly for those supported on HNO3-functionalized NT, reaching a maximum power density of 80 mW cm−2. Conversely, PtIn catalysts exhibit a very poor behavior.

Graphical Abstract

Keywords

PtGe/C and PtIn/C electrocatalysts DMFC Conventional impregnation method Citric and nitric acid functionalized carbons 

Notes

Acknowledgments

This work was financially supported by Universidad Nacional del Litoral and CONICET.

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Copyright information

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

Authors and Affiliations

  • Natalia S. Veizaga
    • 1
  • Virginia I. Rodriguez
    • 1
  • Mariano Bruno
    • 2
  • Sergio R. de Miguel
    • 1
  1. 1.Instituto de Investigaciones en Catálisis y Petroquímica “Ing. José Miguel Parera” (INCAPE)Facultad de Ingeniería Química (UNL)-CONICETSanta FeArgentina
  2. 2.Departamento de Física de la Materia CondensadaComisión Nacional de Energía AtómicaSan MartínArgentina

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