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Synthesis and Electrocatalytic Properties of H2SO4-Induced (100) Pt Nanoparticles Prepared in Water-in-Oil Microemulsion

Authors

  • Roberto A. Martínez-Rodríguez,

    1. NASA-URC Center for Advanced Nanoscale Materials (CANM), Department of Chemistry, University of Puerto Rico, Río Piedras Campus, P.O. Box 23346, San Juan 00931-3346 (Puerto Rico)
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  • Dr. Francisco J. Vidal-Iglesias,

    1. Institute of Electrochemistry, University of Alicante, Ap. 99, 03080 Alicante (Spain)
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  • Dr. José Solla-Gullón,

    1. Institute of Electrochemistry, University of Alicante, Ap. 99, 03080 Alicante (Spain)
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  • Prof. Carlos R. Cabrera,

    1. NASA-URC Center for Advanced Nanoscale Materials (CANM), Department of Chemistry, University of Puerto Rico, Río Piedras Campus, P.O. Box 23346, San Juan 00931-3346 (Puerto Rico)
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  • Prof. Juan M. Feliu

    Corresponding author
    1. Institute of Electrochemistry, University of Alicante, Ap. 99, 03080 Alicante (Spain)
    • Institute of Electrochemistry, University of Alicante, Ap. 99, 03080 Alicante (Spain)===

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Abstract

The increasing number of applications for shape-controlled metal nanoparticles (NPs) has led to the need for easy, cheap, and scalable methodologies. We report the synthesis of (100) preferentially oriented Pt NPs, with a particle size of 9 nm, by using a water-in-oil microemulsion method. The specific surface structure of the NPs is induced by the presence of H2SO4 in the water phase of the microemulsion. Interestingly, the results reported herein show how increasing amounts of H2SO4 lead to the formation of Pt NPs containing a larger amount of (100) sites on their surface. This preferential surface orientation is confirmed electrochemically by using the so-called hydrogen adsorption/desorption process. In addition, transmission electron microscopy measurements confirm the presence of cubic-like Pt NPs. Finally, the electrocatalytic properties of the Pt NPs are evaluated towards ammonia and CO electro-oxidations, which are (100) structure-sensitive reactions.

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