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Palladium nanoparticles supported on phosphorus-doped carbon for ethanol electro-oxidation in alkaline media

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Abstract

Palladium nanoparticles supported on carbon Vulcan XC72 (Pd/C) and on phosphorus-doped carbon (Pd/P-C) were prepared by an alcohol reduction process. X-ray diffractograms of Pd/C and Pd/P-C showed the typical face-centered cubic (fcc) structure of Pd. The crystallite sizes of Pd fcc phase were around 8 nm for both samples. X-ray photoelectron spectroscopy revealed to Pd/C and Pd/P-C that Pd was found predominantly in the metallic state and to Pd/P-C, the presence of P increases the amount of oxygen on the electrocatalyst surface. The activity and stability of the electrocatalyts for ethanol electro-oxidation in alkaline medium was investigated by cyclic voltammetry and chronoamperometry experiments. The peak current density on Pd/P-C was 50% higher than on Pd/C, while the current density measured after 30 min at − 0.35 V vs. Hg/HgO was 65% higher on Pd/P-C than on Pd/C. The enhancement of the catalytic activity of Pd/P-C electrocatalyst might be related to the presence of higher amounts of oxygen species on the surface, which could contribute to the oxidation of intermediates formed during ethanol electro-oxidation process.

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Acknowledgements

The authors wish to thank CNPq (Proc. Nos. 166089/2015-0, 402850/2015-7, 168251/2014-0, and 310051/2012-6), FAPESP (Proc. No. 2014/09087-4), and CAPES for the financial support. We also thank the Brazilian Synchrotron Light Laboratory (LNLS) for the access to the XPS facility, for the use of TEM facilities (JEOL JEM-2100F) of LNNano-CNPEM, and Dr. Daniela Coelho de Oliveira for the XPS analysis support.

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  1. Instituto de Pesquisas Energéticas e Nucleares, IPEN/CNEN-SP, Av. Prof. Lineu Prestes, 2242 Cidade Universitária, CEP, São Paulo, SP, 05508-900, Brazil

    Júlio César M. Silva, Isabel C. de Freitas, Almir O. Neto, Estevam V. Spinacé & Vilmaria A. Ribeiro

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Silva, J.C.M., de Freitas, I.C., Neto, A.O. et al. Palladium nanoparticles supported on phosphorus-doped carbon for ethanol electro-oxidation in alkaline media. Ionics 24, 1111–1119 (2018). https://doi.org/10.1007/s11581-017-2257-9

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