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Título: | Methanol tolerant Pt2CrCo catalysts supported on ordered mesoporous carbon for the cathode of DMFC |
Autor: | Rivera Gavidia, Luis Miguel; García, Gonzalo CSIC ORCID; Celorrio, Verónica CSIC ORCID; Lázaro Elorri, María Jesús CSIC ORCID ; Pastor Tejera, Elena | Palabras clave: | ORR DMFC Methanol tolerance Thermal treatment PtCrCo alloys Graphitized ordered mesoporous carbon |
Fecha de publicación: | 1-jul-2016 | Editor: | Elsevier | Citación: | International Journal of Hydrogen Energy 41(43): 19645-19655 (2016) | Resumen: | Graphitized ordered mesoporous carbon CMK-3-R8 supported PtCrCo electrocatalysts were synthetized by the borohydride reduction method (BM) and then submitted to a reductive thermal treatment (TT) at 300, 500 and 700 °C with the aim to improve their catalytic activity toward the oxygen reduction reaction (ORR) and the methanol tolerance. Atomic composition and total metal loading were determined by energy dispersive X-ray (EDX) analysis and the values obtained were close to the nominal ones, i.e. 20 wt.% PtCrCO/CMK-3. Electrochemical measurements were carried out using rotating disk electrode (RDE) technique in oxygen-saturated sulfuric acid solution in absence and presence of dissolved methanol. Besides other species and parameters, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis revealed the formation of an ordered PtCr alloy phase and the surface enrichment by CrO species with the rise of the annealing temperature. The last, in conjunction with the absence of Pt sites with (110) orientation, enhances the catalytic activity toward the ORR and the methanol tolerance. Kinetic parameters are reported and analyzed in terms of the physicochemical properties of the catalysts obtained by the X-ray techniques. | Descripción: | 10 figures, 4 tables, supplementary information.-- Work presented at the 5th Iberian Symposium on Hydrogen, Fuel Cells and Advanced Batteries (HYCELTEC 2015), 5-8 July 2015, Tenerife, Spain | Versión del editor: | http://dx.doi.org/10.1016/j.ijhydene.2016.06.132 | URI: | http://hdl.handle.net/10261/211560 | DOI: | 10.1016/j.ijhydene.2016.06.132 | Identificadores: | doi: 10.1016/j.ijhydene.2016.06.132 issn: 0360-3199 |
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