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

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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.

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Acknowledgments

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

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Authors and Affiliations

  1. Instituto de Investigaciones en Catálisis y Petroquímica “Ing. José Miguel Parera” (INCAPE), Facultad de Ingeniería Química (UNL)-CONICET, (3000), Santa Fe, Argentina

    Natalia S. Veizaga, Virginia I. Rodriguez & Sergio R. de Miguel

  2. Departamento de Física de la Materia Condensada, Comisión Nacional de Energía Atómica, Avda. General Paz 1499, San Martín, Buenos Aires, Argentina

    Mariano Bruno

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  1. Natalia S. Veizaga
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  2. Virginia I. Rodriguez
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  3. Mariano Bruno
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  4. Sergio R. de Miguel
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Correspondence to Natalia S. Veizaga.

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Veizaga, N.S., Rodriguez, V.I., Bruno, M. et al. The Role of Surface Functionalities in PtGe and PtIn Catalysts for Direct Methanol Fuel Cells. Electrocatalysis 10, 125–133 (2019). https://doi.org/10.1007/s12678-018-0502-2

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