Effects of the electrodeposition time in the synthesis of carbon-supported Pt(Cu) and Pt-Ru(Cu) core-shell electrocatalysts for polymer electrolyte fuel cells

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RECERCAT Home > Universitat de Barcelona > Ciència dels Materials i Química Física > Articles publicats en revistes (Ciència dels Materials i Química Física) > View document

To access the full text documents, please follow this link: http://hdl.handle.net/2445/114066

dc.contributor	Universitat de Barcelona
dc.contributor.author	Caballero Manrique, Griselda
dc.contributor.author	Nadeem, Immad Muhammed.
dc.contributor.author	Brillas, Enric
dc.contributor.author	Centellas Masuet, Francesc A.
dc.contributor.author	Garrido Ponce, José Antonio
dc.contributor.author	Rodríguez González, Rosa Ma.
dc.contributor.author	Cabot Julià, Pere-Lluís
dc.date	2017-07-19T11:11:28Z
dc.date	2017-07-19T11:11:28Z
dc.date	2016-08-18
dc.date	2017-07-19T11:11:29Z
dc.identifier.citation	2073-4344
dc.identifier.citation	663663
dc.identifier.uri	http://hdl.handle.net/2445/114066
dc.format	application/pdf
dc.language.iso	eng
dc.publisher	MDPI
dc.relation	Reproducció del document publicat a: https://doi.org/10.3390/catal6080125
dc.relation	Catalysts, 2016, vol. 6, num. 8, p. 125
dc.relation	https://doi.org/10.3390/catal6080125
dc.rights	cc-by (c) Caballero Manrique, Griselda et al., 2016
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	http://creativecommons.org/licenses/by/3.0/es
dc.subject	Electrocatàlisi
dc.subject	Piles de combustible
dc.subject	Oxidació
dc.subject	Electrocatalysis
dc.subject	Fuel cells
dc.subject	Oxidation
dc.title	Effects of the electrodeposition time in the synthesis of carbon-supported Pt(Cu) and Pt-Ru(Cu) core-shell electrocatalysts for polymer electrolyte fuel cells
dc.type	info:eu-repo/semantics/article
dc.type	info:eu-repo/semantics/publishedVersion
dc.description.abstract	Pt(Cu)/C and Pt-Ru(Cu)/C electrocatalysts with core-shell structure supported on Vulcan Carbon XC72R have been synthesized by potentiostatic deposition of Cu nanoparticles on the support, galvanic exchange with Pt and spontaneous deposition of Ru species. The duration of the electrodeposition time of the different species has been modified and the obtained electrocatalysts have been characterized using electrochemical and structural techniques. The High Resolution Transmission Electron Microscopy (HRTEM), Fast Fourier Transform (FFT) and Energy Dispersive X-ray (EDX) microanalyses allowed the determining of the effects of the electrodeposition time on the nanoparticle size and composition. The best conditions identified from Cyclic Voltammetry (CV) corresponded to onset potentials for CO and methanol oxidation on Pt-Ru(Cu)/C of 0.41 and 0.32 V vs. the Reversible Hydrogen Electrode (RHE), respectively, which were smaller by about 0.05 V than those determined for Ru-decorated commercial Pt/C. The CO oxidation peak potentials were about 0.1 V smaller when compared to commercial Pt/C and Pt-Ru/C. The positive effect of Cu was related to its electronic effect on the Pt shells and also to the generation of new active sites for CO oxidation. The synthesis conditions to obtain the best performance for CO and methanol oxidation on the core-shell Pt-Ru(Cu)/C electrocatalysts were identified. When compared to previous results in literature for methanol, ethanol and formic acid oxidation on Pt(Cu)/C catalysts, the present results suggest an additional positive effect of the deposited Ru species due to the introduction of the bifunctional mechanism for CO oxidation

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