Alloyed Pt₃M (M = Co, Ni) nanoparticles supported on S- and N-doped carbon nanotubes for the oxygen reduction reaction

Stéphane Louisia,
Yohann R. J. Thomas,
Pierre Lecante,
Marie Heitzmann,
M. Rosa Axet,
Pierre-André Jacques and
Philippe Serp

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Published 21 Jun 2019

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1. Figure 1: HRTEM micrographs of: a) CNTs; b) N-CNTs; c) S-CNTs, and d) N-CNTs_HT. (Scale bar = 10 nm).
  
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2. Figure 2: Evolution of the I_D/I_G ratio (from Raman spectroscopy) and the percent of surface heteroatoms (from...
  
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3. Figure 3: TEM micrographs of: a) Pt₃Co/N-CNT; b) Pt₃Co/N-CNT_HT; c) Pt₃Co/S-CNT; d) Pt₃Ni/N-CNT; e) Pt₃Ni/N-CNT...
  
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4. Figure 4: CVs from an RRDE experiment for the catalysts in 0.5 M H₂SO₄ at 5 mV·s⁻¹ under N₂ at 25 °C for a) t...
  
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5. Figure 5: Percentage of H₂O₂ formation during O₂ reduction of the a) Pt₃Co and b) Pt₃Ni catalysts.
  
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6. Figure 6: HRTEM images of a) Co/N-CNT and c) Ni/N-CNT_HT; and STEM-HAADF images of b) Co/N-CNT and d) Ni/N-CNT...
  
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7. Figure 7: HRTEM images of a) Pt₃Co/N-CNT and c) Pt₃Ni/N-CNT_HT, and STEM-HAADF images of b) Pt₃Co/N-CNT and d)...
  
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8. Figure 8: WAXS analysis – red: experimental PDF from a) Pt₃Co/N-CNT and b) Pt₃Ni/N-CNT_HT, green: simulation f...
  
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9. Figure 9: a) HRTEM images of Pt₃Co/N-CNT and b) STEM-HAADF image of Pt₃Co/N-CNT after washing with EDTA.
  
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10. Figure 10: Polarization of Pt₃Co/CB (red); Pt₃Co/N-CNT (dark blue); Pt₃Co/N-CNT_HT (light blue) and Pt₃Ni/N-CNT...
  
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11. Figure 11: Polarization of Pt₃Co/CB (red), unwashed Pt₃Co/N-CNT (dark blue) and unwashed Pt₃Ni/N-CNT_HT (green)...
  
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12. Figure 12: SEM micrographs of MEA sections prepared with Pt₃Co/CB at 0.3 mg_Pt·cm⁻² and Pt₃Co/CNT-N at 0.25 mg_Pt...
  
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13. Figure 13: Polarization curves performed on MEAs integrating: a) Pt₃Co/CB; and b) Pt₃Co/N-CNT. Dark blue: afte...
  
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Beilstein J. Nanotechnol. 2019, 10, 1251–1269, doi:10.3762/bjnano.10.125

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Ultrafine metallic Fe nanoparticles: synthesis, structure and magnetism

Olivier Margeat,
Marc Respaud,
Catherine Amiens,
Pierre Lecante and
Bruno Chaudret

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Published 03 Dec 2010

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1. Figure 1: WAXS diagram (top) and the related RDF (bottom). Black: experimental spectra of Fe NPs taken at roo...
  
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2. Figure 2: WAXS diagram (top) and the related RDF (bottom). Black: Fe NPs taken at room temperature; dark grey...
  
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3. Figure 3: XANES spectra taken at room temperature for metallic Fe NPs, compared to a Fe foil reference, and i...
  
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4. Figure 4: Top: Mössbauer spectra taken at different temperatures. Bottom: experimental spectra (symbols) take...
  
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5. Figure 5: Distributions of the IS and the µ₀H_hyp used to fit the experimental Mössbauer spectrum measured at ...
  
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6. Figure 6: ZFC-FC magnetizations measured under µ_oH = 1 mT. Inset shows the extracted temperature dependence o...
  
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7. Figure 7: AC susceptibility measured for various frequencies (symbols) and their fits (solid lines).
  
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8. Figure 8: Hysteresis loop measured at 2 K. Inset: enlargement near zero field showing the coercive field.
  
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9. Figure 9: Magnetization curves in the superparamagnetic regime plotted versus the applied magnetic field (top...
  
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10. Figure 10: Relaxation time versus the inverse of temperature.
  
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11. Figure 11: FMR spectra collected for various T. Inset displays the evolution of g_eff versus 1/T.
  
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