Exponential improving in the activity of Pt/C nanoparticles towards glycerol electrooxidation by Sb ad-atoms deposition
| Autor: | Pablo S. Fernández, Cinthia R. Zanata, Erico Teixeira-Neto, Cauê A. Martins, T.S. Almeida, Giuseppe A. Camara, Gabriella L. Caneppele |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Process Chemistry and Technology Inorganic chemistry chemistry.chemical_element Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry Platinum nanoparticles 01 natural sciences Catalysis Nanomaterial-based catalyst 0104 chemical sciences chemistry Antimony 0210 nano-technology Selectivity Carbon General Environmental Science |
| Zdroj: | Applied Catalysis B: Environmental. 200:114-120 |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2016.06.072 |
| Popis: | Tuning the chemical composition of heterogeneous nanocatalysts has emerged as an efficient strategy to improve their electroactivity and selectivity for electrolizers and fuel cells application. The stability of a catalyst is ascribed as the ability of the nanoparticles (NPs) in maintaining their chemical composition and physical structure during recycles of use. By an electrochemical procedure, here we decorated platinum nanoparticles supported on carbon with different coverage degrees of antimony ad-atom (θ Sb ) to investigate glycerol electrooxidation reaction (GEOR). The successful decoration of Pt/C with Sb was monitored by electrochemical and physicochemical characterizations. θ Sb is highly dependent on the upper potential applied. Sb atoms are rapidly leached from Pt surface in potentials greater than 0.7 V in acid solution while they remain stable during several cycles in potentials lower than that. We showed that the current density of GEOR exponentially increases with the increase of Sb coverage, reaching 109 times the pseudo stationary current density of Pt/C for high θ Sb . Furthermore, the ad-atom facilitates the reaction by shifting the onset potential towards lower potentials. We found an improvement of −320 mV in the onset for θ Sb = 0.81. |
| Databáze: | OpenAIRE |
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