Get access

N8 Polynitrogen Stabilized on Multi-Wall Carbon Nanotubes for Oxygen-Reduction Reactions at Ambient Conditions

Authors

  • Zhiyi Wu,

    1. Department of Materials Science and Engineering, New Jersey Institute of Technology, Newark, NJ 07102 (USA)
    Search for more papers by this author
  • El Mostafa Benchafia,

    1. Department of Materials Science and Engineering, New Jersey Institute of Technology, Newark, NJ 07102 (USA)
    Search for more papers by this author
  • Prof. Dr. Zafar Iqbal,

    Corresponding author
    1. Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ 07102 (USA)
    • Zafar Iqbal, Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ 07102 (USA)

      Xianqin Wang, Department of Chemical, Biological and Pharmaceutical, Engineering, New Jersey Institute of Technology, Newark, NJ 07102 (USA)

    Search for more papers by this author
  • Prof. Dr. Xianqin Wang

    Corresponding author
    1. Department of Chemical, Biological and Pharmaceutical, Engineering, New Jersey Institute of Technology, Newark, NJ 07102 (USA)
    • Zafar Iqbal, Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ 07102 (USA)

      Xianqin Wang, Department of Chemical, Biological and Pharmaceutical, Engineering, New Jersey Institute of Technology, Newark, NJ 07102 (USA)

    Search for more papers by this author

  • We thank the Max Planck Institute of Colloids and Interfaces (Germany) for providing a carbon nitride reference sample. The work was supported by an NSF CBET 1231682 grant and partially by an ACS-PRF 53582-ND10.

Abstract

Polynitrogen (PN) species (Nn, n from 3 to 8) as highly energetic materials have attracted many theoretical calculations and predictions. N3, N4, N5 or their ions were experimentally detected under high-pressure and high-temperature conditions. Herein, a N8 PN stabilized on the positively charged sidewalls of multi-walled carbon nanotubes (MWNTs) has been synthesized using cyclic voltammetry (CV) under ambient conditions. ATR-FTIR and Raman spectroscopic data assigned on the basis of density functional theory (DFT) calculations support the successful synthesis of a C2h symmetry chain structure of the N8 anion stabilized as MWNT+N8. Temperature programmed desorption (TPD) data show that MWNT+N8 is thermally stable up to 400 °C. Oxygen-reduction reaction (ORR) experiments carried out using MWNT+N8 as the cathodic catalyst shows that it is very active for ORR with an even higher current density than that of a commercial Pt/carbon catalyst.

Ancillary