Enhanced Ethanol Electrooxidation with Palladium-Led Catalysts on Nitrogen-Doped Graphene

Strategic Insights -

Researchers from the Institute of Chemistry have successfully synthesized a series of palladium and palladium-lead nanoparticles supported on nitrogen-doped graphene, demonstrating significantly enhanced ethanol electrooxidation activity and stability. The catalysts, fabricated through a one-step reduction method, showed superior performance compared to traditional palladium-based catalysts, with peak currents reaching up to 152.3 mA cm^-2 for ethanol oxidation. The introduction of lead into the palladium catalyst resulted in the formation of oxygenated species, leading to a synergistic effect that further improved the catalytic activity.

Key Takeaways:

  • The palladium-lead nanoparticles supported on nitrogen-doped graphene exhibited remarkably enhanced ethanol electrooxidation activity, with peak currents reaching up to 152.3 mA cm^-2.
  • The introduction of lead into the palladium catalyst resulted in the formation of oxygenated species, leading to a synergistic effect that improved catalytic activity.
  • The use of nitrogen-doped graphene as a support material provided a faster dehydrogenation rate and an electron effect that enhanced palladium's activity.
  • The PdPb/N-doped graphene catalyst (Pd: Pb = 8:1.0) demonstrated a 4.0 and 2.9 times higher activity compared to Pd/Graphene and Pd/C, respectively.
  • The catalytic durability and stability were also significantly improved.
  • The research utilized atomic absorption spectroscopy, X-ray powder diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy to characterize the catalysts.
  • The study involved the synthesis of several palladium and palladium-lead nanoparticles supported on active carbon, graphene, and nitrogen-doped graphene.

Statistics:

  • Peak current for ethanol electrooxidation of Pd/N-doped graphene: 70.2 mA cm^(-2)
  • Peak current for ethanol electrooxidation of Pd/Graphene: 38.0 mA cm^(-2)
  • Peak current for ethanol electrooxidation of Pd/C: 51.9 mA cm^(-2)
  • PdPb/N-doped graphene catalyst (Pd: Pb = 8:1.0) activity: 152.3 mA cm^(-2)
  • Increase in activity compared to Pd/Graphene: 4.0
  • Increase in activity compared to Pd/C: 2.9

Sources:

  • Nitrogen-doped graphene supported highly dispersed palladium-lead nanoparticles for synergetic enhancement of ethanol electrooxidation in alkaline medium. Electrochimica Acta, 2015;152():68-74.
  • Electrochimica Acta can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England.
  • P. Wu, Chinese Academy Sci, Inst Chem, BNLMS, Beijing 100190, People's Republic of China.