Characterization Microstructural and Electrochemical of AgPd Alloy Bimetallic Nanoparticles
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Characterization Microstructural and Electrochemical of AgPd Alloy Bimetallic Nanoparticles A. Santoveña1, C. Rodriguez-Proenza1, J.A. Maya-Cornejo1, A. Ruiz-Baltazar2, D. Bahena3, J. Ledesma4, R. Pérez1 and R. Esparza1,* 1
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Santiago de Querétaro, Querétaro 76230, México.
2
CONACYT, Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Santiago de Querétaro, Querétaro 76230, México
3
Laboratorio Avanzado de Nanoscopía Electrónica (LANE), Centro de Investigación y de Estudios Avanzados del I.P.N., Av. Instituto Politécnico Nacional 2508 Col. San Pedro Zacatenco, México D.F., 07360, México.
4
División de Investigación y Posgrado, Facultad de Ingeniería, Universidad Autónoma de Querétaro, 76010, Qro., México *Email: [email protected]
ABSTRACT Bimetallic nanoparticles are of special interest for their potential applications to fuel cells, among the bimetallic systems, AuPd bimetallic nanoparticles have received great interest as they can be widely used as effective catalysts for various electrochemical reactions. Monodisperse AgPd alloy nanoparticles were synthesized by polyol method using silver nitrate and potassium tetrachloropalladate(II) in ethylene glycol as the reducing agent at 160 °C. Structural, compositional and electrochemical characterizations of synthesized bimetallic nanoparticles were investigated. High-angle annular dark field scanning/transmission electron microscopy (HAADFSTEM) images and parallel beam X-ray diffraction (XRD) of the bimetallic nanoparticles were obtained. XRD and the contrast of the HAADF-STEM images show that the bimetallic nanoparticles have an alloy structure. Cyclic voltammetry was carried out in order to confirm the electrochemical responses of the AgPd/C electrocatalysts for methanol oxidation. Thanks to the narrow size distribution of the AgPd alloy bimetallic nanoparticles (9.15 nm) the supported AgPd/C electrocatalysts have high catalytic activity toward methanol electro-oxidation. INTRODUCTION Bimetallic nanoparticles systems are very interesting materials due to their notable properties in comparison to the monometallic systems [1]. The combination of different metals and different particle sizes offer a wide range of possible applications in different fields as catalysis, optoelectronics, biology, medicine and electronics [2], [3]. In this sense bimetallic nanoparticles with alloy nanostructure are of great significance because of the modification of properties observed, compared with their counterpart monometallic, not only due to size effects, but also as a result of the combination of different metals [1]. Because the properties of
2857 Downloaded from https://www.cambridge.org/core. Purdue University Libraries, on 07 Nov 2017 at 03:14:41, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/adv.2017.561
monometall
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