Abstract
In this work, monometallic Pt and bimetallic Au@Pt (core-shell) nanoparticles with different shapes are synthesized by adding Ag+ as a shape-modifying agent, polyhedral forms are obtained: Pt0.02 (cubic form), bimetallic Au@Pt0.1 (angulated polyhedral form), and Au@Pt0.2 (polyhedral and cube forms). The nanoparticle’s shape depends on the amount of Ag+ used during synthesis (subindex indicates the Ag/Pt ratio in all cases). Without Ag+, quasi-spherical Pt and Au@Pt nanoparticles are obtained. The polyhedral and angulated shapes of Pt0.02/C and Au@Pt0.1/C are more active for methanol oxidation (0.5 M methanol + 0.5 M H2SO4), in comparison with the quasi-spherical Pt/C, Au@Pt/C and polyhedral/cubic Au@Pt0.2/C nanoparticles. From these results, it is found that the electrochemical response of the tested catalysts varies not only due to the nature of the electrocatalyst (Pt/C or Au@Pt/C) but on the nanoparticle’s shape which is also associated with the dominant crystal plane on their surfaces.
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Acknowledgements
The authors are thankful to the Laboratory of Microscopy of the DCBI-UAM-Azc for STEM images and the Department of Materials at UAM-Azc for financing the present research. NRO wishes to thank CONACyT for the studentship 542829, postgraduate studies. Furthermore, SCA, EMAE, and MEPP, thank SNI (CONACyT) for the distinction granted.
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Roque-de-la-O, N., Vázquez-Huerta, G., Corona-Avendaño, S. et al. Methanol electro-oxidation on carbon-supported Pt and Au@Pt nanoparticles with quasi-spherical and polyhedral forms in acid aqueous medium. J Solid State Electrochem 27, 2927–2936 (2023). https://doi.org/10.1007/s10008-023-05564-0
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DOI: https://doi.org/10.1007/s10008-023-05564-0