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• Cerritos, R
• Guerra-Balcázar, M
• Ramírez, R
• Ledesma-García, J
• Arriaga, L
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• Guerra-Balcázar, M
• Ramírez, R
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• Guerra-Balcázar, M
• Ramírez, R
• Ledesma-García, J
• Arriaga, L

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Materials 2012, 5(9), 1686-1697; doi:10.3390/ma5091686

Article

Morphological Effect of Pd Catalyst on Ethanol Electro-Oxidation Reaction

Raúl Carrera Cerritos ^1,2 , Minerva Guerra-Balcázar ³ , Rosalba Fuentes Ramírez ² , Janet Ledesma-García ³  and Luis Gerardo Arriaga ^1,*

¹ Center for Research and Technological Development in Electrochemistry, Parque Tecnológico Querétaro s/n, Sanfandila, Pedro Escobedo, Qro., C.P. 76703, México ² Chemical Engineering Department, University of Guanajuato, Natural Sciences Division, Noria Alta s/n, Col. Noria Alta, Guanajuato, Gto., C.P. 36050, México ³ Research and Graduate Division, Engineering Faculty, Autonomous University of Queretaro, Cerro de las Campanas, Querétaro, Qro., C.P. 76010, México

* Author to whom correspondence should be addressed.

Received: 27 June 2012; in revised form: 31 July 2012 / Accepted: 13 August 2012 / Published: 19 September 2012

(This article belongs to the Special Issue Metal Nanoparticles 2012)

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Abstract: In the present study, three different structures with preferentially exposed crystal faces were supported on commercial carbon black by the polyol method (nanoparticles (NP/C), nanobars (NB/C) and nanorods (NR/C)). The electrocatalysts were characterized by XRD, TEM, TGA and cyclic voltammetry at three different ethanol concentrations. Considerable differences were found in terms of catalytic electroactivity. At all ethanol concentrations, the trend observed for the ethanol oxidation peak potential was preserved as follows: NB/C < NP/C< NR/C < commercial Pd/C. This result indicates that, from a thermodynamics point of view, the NB/C catalyst enclosed by Pd(100) facets presented the highest activity with respect to ethanol electro-oxidation among all of the catalysts studied.

Keywords: Pd nanoparticles; Pd nanobars; Pd nanorods; ethanol electro-oxidation

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