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

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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.

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Funding

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

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Authors and Affiliations

  1. Laboratório de Eletroquímica e Energia – LEEN, Departamento de Química, Universidade Federal do Amazonas, Av. Gal Rodrigo Octávio, 6200, Manaus, AM, 69077-000, Brazil

    Vanessa M. F. de Araujo, Leandro A. Pocrifka & Raimundo R. Passos

  2. Scuola di Scienza dei Materiali, Via 25 Aprile 22, Cogoleto, 16016, Genoa, Italy

    Ermete Antolini

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  1. Vanessa M. F. de Araujo
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  2. Ermete Antolini
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  3. Leandro A. Pocrifka
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  4. Raimundo R. Passos
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Correspondence to Raimundo R. Passos.

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de Araujo, V.M.F., Antolini, E., Pocrifka, L.A. et al. Electro-oxidation of Glycerol on Carbon Supported Pt75CoxNi25-x (x = 0, 0.9, 12.5, 24.1 and 25) Catalysts in an Alkaline Medium. Electrocatalysis 9, 673–681 (2018). https://doi.org/10.1007/s12678-018-0475-1

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