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[International Journal of Hydrogen Energy] A pulsed laser synthesis of nanostructured bi-layer plati


Abstract:

In the present work, we report the synthesis by pulsed laser deposition technique of binder-free platinum layer coated with silver layer, with each layer having a thickness of about 25 nm. The resulting Pt/Ag material exhibits clear electrocatalytic activity for oxygen reduction reaction (ORR) in alkaline solution. More interestingly, it shows no activity for methanol oxidation reaction (MOR), in contrast to Pt. Furthermore, the Pt/Ag catalyst demonstrates selective activity for ORR even in the presence of concentration of methanol as high as 5 M. Such high methanol tolerance indicates good perspectives for the application of Pt/Ag catalysts in alcohol fuel cell cathodes. For portable electronic applications, the binder-free structure of the Pt/Ag catalyst with its planar deposition make it very attractive as a cathode for membrane-type DMFCs or for membraneless fuel cells such as mixed reactant microfluidic fuel cell that depends on the characteristics of the electrodes to separate the oxidation and reduction reactions.

J.C. Abrego-Martínez a, b, Youling Wang b, J. Ledesma-García c, F.M. Cuevas-Muñiz a, , , L.G. Arriaga a, Mohamed Mohamedi b, a Centro de Investigación y Desarrollo Tecnológico en Electroquímica, Parque Tecnológico Querétaro S/N, Pedro Escobedo, Querétaro, 76703, Mexico b Énergie, Matériaux et Télécommunications (EMT), Institut National de la Recherche Scientifique (INRS), 1650 Boulevard Lionel Boulet, Varennes, Québec, J3X 1S2, Canada c División de Investigación y Posgrado, Facultad de Ingeniería, Universidad Autónoma de Querétaro, Cerro de las campanas S/N, Santiago de Querétaro, Querétaro, 76010, Mexico Received 12 January 2017, Revised 21 February 2017, Accepted 22 February 2017, Available online 18 March 2017

http://dx.doi.org/10.1016/j.ijhydene.2017.02.165

Link: http://www.sciencedirect.com/science/article/pii/S0360319917307358

#03242017 #MaterialScience #fuelcell #biofuels #ORR #MOR #electrode

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