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Electrocatalysis

, Volume 9, Issue 6, pp 673–681 | Cite as

Electro-oxidation of Glycerol on Carbon Supported Pt75CoxNi25-x (x = 0, 0.9, 12.5, 24.1 and 25) Catalysts in an Alkaline Medium

  • Vanessa M. F. de Araujo
  • Ermete Antolini
  • Leandro A. Pocrifka
  • Raimundo R. Passos
Original Research
  • 141 Downloads

Abstract

Binary and ternary Pt75CoxNi25-x/C (x = 0, 0.9, 12.5, 24.1, and 25) electrocatalysts were prepared by a polyol method, and their activity for carbon monoxide and glycerol oxidation in alkaline media was compared to that of a conventional Pt/C catalyst. Formation of partially alloyed catalysts was detected by XRD analysis, with the most part of the non-precious metals in a non-alloyed form. The onset potential for carbon monoxide and glycerol oxidation on binary and ternary Pt75CoxNi25-x/C catalysts was lower than that on Pt/C. The higher activity for glycerol oxidation of the Pt75Co0.9Ni24.1/C and Pt75Co12.5Ni12.5/C catalysts than that of the parent binary catalysts was ascribed to the formation of highly active CoxNi1-x(OH)2/CoxNi1-xOOH redox couples with a Co/Ni atomic ratio ≤ 1. Conversely, the replacement of a small amount of Co (0.9 at.%) by Ni did not increase the glycerol oxidation activity of the resulting Pt75Co24.1Ni0.9/C catalyst. The higher activity for glycerol oxidation of Pt75Co12.5Ni12.5/C than that of Pt75Co0.9Ni24.1/C for potentials > 0.7 V vs. RHE, despite the lower Ni-based oxide content and the higher particle size, indicated that at these potentials, the Co12.5Ni12.5(OH)2/Co12.5Ni12.5OOH redox couple is more active for glycerol oxidation than the Co0.9Ni24.1/Co0.9Ni24.1OOH redox couple.

Graphical Abstract

Keywords

Glycerol oxidation activity Supported catalysts Pt-Co/C, Pt-Ni/C, Pt75CoxNi25-x/C electrocatalysts 

Notes

Funding Information

The authors thank CNPq (Grant Nos. 554613/2010-7 and 456336/2013-3), FAPEAM, and CAPES for funding this study.

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

Authors and Affiliations

  1. 1.Laboratório de Eletroquímica e Energia – LEEN, Departamento de QuímicaUniversidade Federal do AmazonasManausBrazil
  2. 2.Scuola di Scienza dei MaterialiGenoaItaly

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