Platinum–rhodium–tin/carbon electrocatalysts for ethanol oxidation in acid media: effect of the precursor addition order and the amount of tin

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Title: Platinum–rhodium–tin/carbon electrocatalysts for ethanol oxidation in acid media: effect of the precursor addition order and the amount of tin
Authors: López Suárez, Franz Edwin | Pérez-Cadenas, María | Bueno López, Agustín | Carvalho-Filho, Carlos T. | Eguiluz, Katlin Ivon Barrios | Salazar Banda, Giancarlo Richard
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Bifunctional effect | Nanoparticles | Electrocatalysts composition | Electrocatalysis | Fuel cell
Knowledge Area: Química Inorgánica
Issue Date: Oct-2015
Publisher: Springer Science+Business Media Dordrecht
Citation: Journal of Applied Electrochemistry. 2015, 45(10): 1057-1068. doi:10.1007/s10800-015-0879-z
Abstract: Carbon-supported Pt x –Rh y –Sn z catalysts (x:y:z = 3:1:4, 6:2:4, 9:3:4) are prepared by Pt, Rh, and Sn precursors reduction in different addition order. The materials are characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy techniques and are evaluated for the electrooxidation of ethanol in acidic media by cyclic voltammetry, chronoamperometry, and anode potentiostatic polarization. The influence of both the order in which the precursors are added and the composition of metals in the catalysts on the electrocatalytic activity and physico-chemical characteristics of Pt x –Rh y –Sn z /C catalysts is evaluated. Oxidized Rh species prevail on the surface of catalysts synthesized by simultaneous co-precipitation, thus demonstrating the influence of synthesis method on the oxidation state of catalysts. Furthermore, high amounts of Sn in composites synthesized by co-precipitation result in very active catalysts at low potentials (bifunctional effect), while medium Sn load is needed for sequentially deposited catalysts when the electronic effect is most important (high potentials), since more exposed Pt and Rh sites are needed on the catalyst surface to alcohol oxidation. The Pt3–Rh1–Sn4/C catalyst prepared by co-precipitation is the most active at potentials lower than 0.55 V (related to bifunctional effect), while the Pt6–Rh2–Sn4/C catalyst, prepared by sequential precipitation (first Rh and, after drying, Pt + Sn), is the most active above 0.55 V.
Sponsor: The authors thank the Brazilian National Council of Technological and Scientific Development-CNPq (Grants: 402243/2012-9, 303630/2012-4, 474261/2013-1, 407274/2013-8, and 310282/2013-6) for the scholarships and financial support for this work.
URI: http://hdl.handle.net/10045/57897
ISSN: 0021-891X (Print) | 1572-8838 (Online)
DOI: 10.1007/s10800-015-0879-z
Language: eng
Type: info:eu-repo/semantics/article
Rights: © Springer Science+Business Media Dordrecht 2015. The final publication is available at Springer via http://dx.doi.org/10.1007/s10800-015-0879-z
Peer Review: si
Publisher version: http://dx.doi.org/10.1007/s10800-015-0879-z
Appears in Collections:INV - MCMA - Artículos de Revistas

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