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Effect of Core Composition in AuxCuy@Pt/C for the Methanol Oxidation Reaction

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Abstract

In this work, the effect of core composition in AuxCuy@Pt/C core@shell catalysts for methanol oxidation is investigated. The catalysts were prepared varying Au:Cu atomic percentage (i.e., 100:0, 75:25, 50:50, 25:75, and 0:100 %) while maintaining Pt constant. The average particle size of every sample was obtained from STEM measurements, while XRD measurements allowed to determining their crystal structure; in all cases, a FCC crystal structure was obtained. From chronoamperometry, it was found that the values of steady-state current density (I ss) increased with the gold content in the core, i.e., I ss values are 2.52, 1.86, 1.18, 0.34, and 0.18 mA cm−2 for Au100Cu0@Pt, Au75Cu25@Pt, Au50Cu50@Pt, Au25Cu75@Pt, and Au0Cu100@Pt, respectively. Similar results were obtained by using cyclic voltammetry, where the value of the peak current density increased as the gold content in the core increased: this behavior is associated to the modified electrochemical activity of Pt shell caused by the core composition (AuxCuy).

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Acknowledgments

The authors are thankful to the Department of Materials at UAM-A for financing the present research and the Laboratory of Microscopy of the D-CBI, UAM-Azc, for STEM images. Further, GVH, MEPP, MARR, and MGMO thank the SNI (CONACyT) for the distinction granted and the stipends received. JAG wishes to thank CONACyT for his studentship 267687 to have a postdoctoral position ESIQIE-IPN.

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  1. Department of Materials, CBI, Universidad Autónoma Metropolitana-Azcapotzalco, Av. San Pablo 180, Colonia Reynosa- Tamaulipas, C.P. 02200, México, D.F., Mexico

    G. Vázquez-Huerta, M. E. Palomar-Pardavé, M. A. Romero-Romo, M. G. Montes de Oca-Yemha, E. Garfias-García & J. I. Aldana-González

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  1. G. Vázquez-Huerta
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Correspondence to G. Vázquez-Huerta.

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Vázquez-Huerta, G., Palomar-Pardavé, M.E., Romero-Romo, M.A. et al. Effect of Core Composition in AuxCuy@Pt/C for the Methanol Oxidation Reaction. Electrocatalysis 7, 174–183 (2016). https://doi.org/10.1007/s12678-015-0296-4

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