Abstract
This work reports the facile synthesis of Pt-Mn nanoparticles supported on multiwall carbon nanotubes using the Brust–Schiffrin method and their electrochemical performance during methanol electro-oxidation reaction. According to the topographical and structural results, the Pt-Mn nanoparticles present high dispersion with a narrow size distribution of ~ 2.5 nm. Meanwhile, the electrochemical evaluation exhibits a greatly enhanced electrocatalytic activity. The electrocatalyst's performance improves as Mn increased up to 40 at.% in Pt nanoparticles, but it decreases as Mn reaches 50 at.%. The electrocatalytic activity fall could be attributed to a reduction on active sites favorable to the dissociation and dehydrogenation of methanol. Density functional theory computations reveal that the partial density of states (PDOS) associated with [Mn]3d orbitals could be directly correlated with the observed electrocatalytic behavior. The respective maximum PDOS contribution at the Fermi level also corresponds to the most active electrocatalyst, which contains Mn of ~ 40 at.%.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgments
We thank to A. Eloisa, Fco. Ruiz, I. Gradilla, A. Tiznado, and J. Peralta from CNyN-UNAM for their technical support. We acknowledge CONACyT (under projects 254667, 117373, 274314) for its financial support.
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This study was supported by Consejo Nacional de Ciencia y Tecnología (Grant Nos. 254667, 117373, 274314).
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Rodríguez, J.R., Verde-Gómez, Y., Díaz de León, J.N. et al. Effect of Pt-Mn nanoparticles supported on CNT in methanol electro-oxidation reaction, experimental, and theoretical studies. Journal of Materials Research 36, 4216–4226 (2021). https://doi.org/10.1557/s43578-021-00275-6
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DOI: https://doi.org/10.1557/s43578-021-00275-6