Science Advances

Supplementary Materials

This PDF file includes:

  • Supplementary Materials and Methods
  • Supplementary Text
  • Fig. S1. Comparison of the as-prepared samples in N2 and Ar.
  • Fig. S2. GNPs after different nitrogenation times.
  • Fig. S3. GNPs after different nitrogenation times.
  • Fig. S4. Studies of the rotation speed of ball milling, the loading amount of graphite, the critical reaction pressure, and temperature of the ball-mill container.
  • Fig. S5. Ball milling by ZrO2 balls.
  • Fig. S6. The poisoning experiments.
  • Fig. S7. The self-nitrogenating protection phenomenon of Fe balls.
  • Fig. S8. The transfer experiments.
  • Fig. S9. Extension to other carbon materials.
  • Table S1. Elemental analysis of the GNP.

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