This PDF file includes:

• fig. S1. TEM, HAADF-STEM images, and histograms of diameter and length of Pt NWs.
  
• fig. S2. XPS spectra of Pt NWs.
  
• fig. S3. Additional HRTEM images of Pt NWs.
  
• fig. S4. TEM, HAADF-STEM images, and histograms of diameter and length of PtNi NWs.
  
• fig. S5. Additional TEM and HRTEM images of PtNi NWs.
  
• fig. S6. STEM image and EDS line scan of PtNi NWs.
  
• fig. S7. TEM images, histograms of diameter and length, PXRD pattern, and EDS pattern of PtCo NWs.
  
• fig. S8. TEM images, histograms of diameter and length, PXRD pattern, and EDS pattern of PtNiCo NWs.
  
• fig. S9. STEM image and EDS line scan of PtNiCo NWs.
  
• fig. S10. TEM images, histograms of diameter and length, PXRD pattern, and EDS pattern of 9-nm Pt NWs and 35-nm Pt NWs.
  
• fig. S11. TEM images of diameter and length changes of Pt NW intermediates obtained with different reaction times.
  
• fig. S12. TEM images of the products collected from the reaction with the same condition used in the synthesis of unique Pt NWs but changing Mo(CO)₆.
  
• fig. S13. TEM images of the products collected from the reaction with the same condition used in the synthesis of unique Pt NWs but changing Ni(acac)₂.
  
• fig. S14. TEM images of the products collected from the reaction with the same condition used in the synthesis of unique Pt NWs but changing Ni(acac)₂ with Fe(acac)₂.
  
• fig. S15. TEM images of the products collected from the reaction with the same condition used in the synthesis of unique Pt NWs but with different amount of CTAC.
  
• fig. S16. Fourier transform infrared spectroscopy spectrum of PtNi NWs/C.
  
• fig. S17. TEM images of Pt NWs on commercial carbon.
  
• fig. S18. TEM images of PtNi NWs on commercial carbon.
  
• fig. S19. TEM images of PtNiCo NWs on commercial carbon.
  
• fig. S20. TEM image and diameter histogram of Pt NWs with the diameter of 4.5 nm.
  
• fig. S21. ORR polarization curves, CVs, mass, and specific activities of Pt NWs with different lengths.
  
• fig. S22. TEM images of commercial Pt/C.
  
• fig. S23. CVs of Pt/C, PtNi NWs/C, and PtNiCo NWs/C before and after 30,000 cycles.
  
• fig. S24. TEM image, EDS pattern, and EDS line scan of PtNi NWs/C after 30,000 cycles.
  
• fig. S25. TEM image, EDS pattern, and EDS line scan of PtNiCo NWs/C after 30,000 cycles.
  
• fig. S26. TEM images of commercial Pt/C catalyst after 30,000 cycles.
  
• fig. S27. TEM, PXRD pattern, and EDS pattern of Pt_84.4Ni_15.6 NWs.
  
• fig. S28. TEM, PXRD pattern, and EDS pattern of Pt_64.6Ni_35.4 NWs.
  
• fig. S29. TEM, PXRD pattern, and EDS pattern of Pt_78.5Co_21.5 NWs.
  
• fig. S30. TEM, PXRD pattern, and EDS pattern of Pt_67.1Ni_23.0Co_9.9 NWs.
  
• fig. S31. Image of ~50-ml PtNi NW colloidal solution and TEM images of PtNi NWs.
  
• table S1. Atomic ratios of PtNi NWs and PtNiCo NWs characterized by ICP, EDS, and XPS.
  
• table S2. Performance comparisons of various Pt-based NWs and this work.
  
• References (50–55)

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