Effect of OMC and MWNTC support on mass activity of Pd Co catalyst for formic acid electro-oxidation
| Autor: | M. D. Morales-Acosta, E. Cazares-Ávila, F.J. Rodríguez-Varela, D. Morales-Acosta, Aracely Hernández-Ramírez, E. Ruiz-Ruiz |
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| Rok vydání: | 2017 |
| Předmět: |
Aqueous solution
Renewable Energy Sustainability and the Environment Chemistry Formic acid Inorganic chemistry Energy Engineering and Power Technology Nanoparticle 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences law.invention Catalysis chemistry.chemical_compound Fuel Technology law Cyclic voltammetry 0210 nano-technology Mesoporous material |
| Zdroj: | International Journal of Hydrogen Energy. 42:30349-30358 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2017.08.156 |
| Popis: | The electrochemical evaluation of Pd Co catalyst supported on Ordered Mesoporous Carbon (Pd Co/OMC) synthesized by the polyol method is reported in this work. OMC is synthesized via self-assembly in aqueous solution, as an alternative route to conventional preparation methods. The electrocatalytic performance of Pd Co/OMC is evaluated for Formic Acid Oxidation Reaction (FAOR). The results are compared with those of Pd Co on Multi-Walled Carbon Nanotubes (Pd Co/MWCNT) and Pd/OMC, prepared by the same procedure, with the aim to evaluate the effect of support and the Co contribution during the FAOR. The catalysts are characterized by scanning and transmission electron microscopy (SEM and TEM), X-ray diffraction (XRD) and small-angle X-ray scattering (SAXS). Cyclic voltammetry (CV) and chronoamperometric studies are carried out in acid media with different formic acid concentrations (0.1, 0.5 and 1 mol L−1). According to TEM results, Pd Co/OMC exhibits smaller particle size (∼3.5 nm) and enhanced distribution of nanoparticles compared with Pd Co/MWCNT. At 0.5 mol L−1 HCOOH, Pd Co/OMC delivers a higher anodic mass current density (185 mA mg−1 Pd) of the FAOR than Pd Co/MWCNT (94.3 mA mg−1 Pd). Moreover, at 1 mol L−1 HCOOH the jf/jb ratio for Pd Co/OMC is 1.09 mA mg−1 Pd, higher than the ratios determined for Pd Co/MWCNT (0.76) and Pd/OMC (0.85). The improvement of the mass catalytic activity of Pd Co/OMC is attributed to the combination of the mesoporous structure of the support, which promotes the catalyst-support interaction facilitating the mass transfer process during the reaction, and to the incorporation of Co in the Pd structure. |
| Databáze: | OpenAIRE |
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