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Synthesis of PtCo/ZSM-5/C electrocatalyst and electrochemical activity

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Abstract

This study presents the synthesis and electrochemical characterization of a bimetallic PtCo electrocatalyst supported in a ZSM-5 zeolite and XC-72R Vulcan carbon 50 wt.% composite. Two synthesis methodologies were tested: reduction mediated by ethylene glycol and NaBH4. The catalyst electroactivity was assessed by measuring the electrochemical surface area, ESA, and the electrooxidation of methanol was evaluated by cyclic voltammetry and chronoamperometry in acid medium. The nanoelectrocatalysts were obtained with average particle size nearly 3.0 nm and ESA up to 44.7 m2 g−1, indicating the effectiveness of the synthesis methods and of the composite ZSM-5/C used as catalyst support. XPS studies showed that PtCo alloy was obtained by NaBH4 reduction. All samples presented good tolerance to carbonaceous species indicated by jf/jb ratio greater than 1 in methanol oxidation activity test. The 1-h chronoamperometry tests corroborated these results. Some samples obtained in the present work showed higher current density in steady state compared to the commercial sample used as reference and analyzed under the same experimental process. The results showed that the zeolite support was effective at improving catalytic activity independently of the alloy PtCo presence on the catalyst surface.

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Acknowledgements

The authors would like to thank Oleksii Kuznetsov for XRF measurements and CENABIO for TEM images.

Funding

This work was supported by the Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (Nos. E-26/110.665/2013 and E-26/010.001095/2015).

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Authors and Affiliations

  1. Grupo de Materiais Condutores de Energia, Escola de Química, Universidade Federal do Rio de Janeiro, Av. Athos da Silveira Ramos, 149, CT, Bl E, Rio de Janeiro, 21941-909, Brazil

    Ana Maria Rocco, Karen Vieira Melo, Marcus V. David & Isis Nunes de Souza

  2. Instituto de Química, Universidade Federal do Rio de Janeiro, Av. Athos da Silveira Ramos, 149, CT, Bl A, Rio de Janeiro, 21941-909, Brazil

    Claudio Jose de Araújo Mota

  3. Divisão de Metrologia de Materiais (DIMAT), Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO), Duque de Caxias, Brazil

    Marcus V. David

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  1. Ana Maria Rocco
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  2. Karen Vieira Melo
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  3. Claudio Jose de Araújo Mota
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Correspondence to Ana Maria Rocco.

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Rocco, A.M., Melo, K.V., de Araújo Mota, C.J. et al. Synthesis of PtCo/ZSM-5/C electrocatalyst and electrochemical activity. Ionics 25, 253–264 (2019). https://doi.org/10.1007/s11581-018-2572-9

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  • DOI: https://doi.org/10.1007/s11581-018-2572-9

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