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Article Dans Une Revue Electrochimica Acta Année : 2019

Insights on the unique electro-catalytic behavior of PtBi/C materials

Résumé

Molecular dynamics simulations have been performed to study the growth and the final structure of PtxBi1-x clusters under conditions close to those encountered in classical low temperature chemical or physical synthesis methods, such as the water-in-oil route or plasma sputtering route, respectively. According to the simulations, PtxBi1-x nanoparticles should consist in well crystallized Pt core surrounded by Bi structures, with strong interaction between Pt and Bi atoms. The simulation results were compared with physicochemical characterizations of PtxBi1-x/C (x = 1.0, 0.9 and 0.8) materials synthesized at room temperature via the water-in-oil microemulsion method. XRD and XPS measurements led to the conclusion that Pt and Bi were not alloyed in PtxBi1-x nanoparticles and that the nanoparticle surface was bismuth-rich, respectively, in perfect agreement with molecular dynamics simulations. XPS and electrochemical measurements allowed also demonstrating a strong electronic interaction between Pt and Bi, still in agreement with molecular dynamics. The electrocatalytic behaviors of the PtxBi1-x/C catalysts have been studied. PtxBi1-x/C displayed the higher activity towards glycerol electrooxidation in alkaline media, with an onset potential of ca. 0.300 V vs RHE and a unique selectivity towards glyceraldehyde/dihydroxyacetone formation for potentials lower * ISE member

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Matériaux Plasmas
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Dates et versions

hal-02353028 , version 1 (07-11-2019)

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Bitty Roméo Serge Kouamé, Steve Baranton, Pascal Brault, Christine Canaff, William Chamorro-Coral, et al.. Insights on the unique electro-catalytic behavior of PtBi/C materials. Electrochimica Acta, 2019, 329, pp.135161. ⟨10.1016/j.electacta.2019.135161⟩. ⟨hal-02353028⟩
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