Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 25, Pages 13045-13058Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp400824n
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Funding
- Spanish Ministry of Science and Innovation (MICINN)
- FEDER [MAT2008-06631-C03-01, MAT2008-06631-C03-02, CTQ2011-28913-C02-01]
- Spanish Ministry of Economy and Competitiveness (Secretaria de Estado de I+D+I)
- Spanish Ministry of Economy and Competitiveness (Secretaria de Estado de I+D+i) Ramon y Cajal
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PtRu catalysts were prepared using a highly mesoporous carbon xerogel submitted to different oxygen functionalization treatments: diluted and concentrated nitric acid as well as gas-phase 5% O-2-N-2 oxidation. Catalysts with 20 wt % loading and equimolar Pt:Ru metallic phase were prepared using an impregnation procedure involving chemical reduction with formic acid. The so-obtained carbon materials, as well as the different catalysts synthesized, were characterized by means of N-2 physisorption, temperature-programmed desorption (TPD), X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Cyclic voltammetry and chronoamperometry were performed to study their activity toward carbon monoxide and methanol oxidation. Functionalization of the carbon support was found to play a definitive role in the interaction between carbon material and the active phase, determining metallic dispersion, alloying degree, and reduction extent. The activity of the catalysts in methanol electro-oxidation was directly related to the metal. oxidation state and alloying degree.
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