Highly dispersed PtCo nanoparticles on micro/nano-structured pyrolytic carbon from refined sugar for methanol electro-oxidation in acid media
| Autor: | Mayda Lam-Maldonado, Paz Del-Ángel-Vicente, David Macias-Ferrer, J.A. Melo-Banda, José Y. Verde-Gomez, R. Silva-Rodrigo, Ulises Páramo-García |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
02 engineering and technology General Chemistry Chronoamperometry 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound chemistry Pyrolytic carbon Methanol Cyclic voltammetry Fourier transform infrared spectroscopy 0210 nano-technology High-resolution transmission electron microscopy Nuclear chemistry |
| Zdroj: | Catalysis Today. 349:159-167 |
| ISSN: | 0920-5861 |
| Popis: | In this work, anodic electrocatalyst (20%wt of metal loading) as PtCo nanoparticles (atomic ratio of 48:52) on micro/nano-structured pyrolytic carbon (MNC) was synthesized by sequential impregnation method and chemical reduction route using citric acid and Ar-H2 static atmosphere. MNC sample was synthesized via nanocasting process with anhydrous pyrolysis at 800 °C using SBA-15 as hard template and refined sugar as carbon source. SBA-15 was prepared via sol gel using pluronic P-123 as surfactant and tetraethoxysilane as silica precursor. The prepared materials were characterized by means of N2 physisorption, X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy and high resolution transmission electron microscopy. The performance of PtCo/MNC for methanol oxidation reaction (MOR) was measured by cyclic voltammetry, chronoamperometry. The electrochemical characterization techniques revealed that the mass activity of PtCo/MNC and the commercial electrocatalyst Pt/C (20%wt of Pt loading) at 20 cycles were 481 and 372 mA/mgPt respectively as well as the resistance to the accumulation intermediate carbonaceous species (methoxy, aldehyde, formaldehyde and carbon monoxide) denoted by the ratio If/Ib for these catalysts were 1.30 and 0.76 respectively. PtCo/MNC exhibit better electrocatalytic performance, electrochemical stability and best resistance to carbonaceous intermediates species in the electro-oxidation of methanol. |
| Databáze: | OpenAIRE |
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