N8 polynitrogen stabilized on multi-wall carbon nanotubes for oxygen-reduction reactions at ambient conditions

Zhiyi Wu, El Mostafa Benchafia, Zafar Iqbal, Xianqin Wang

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)12555-12559
Number of pages5
JournalAngewandte Chemie - International Edition
Volume53
Issue number46
DOIs
StatePublished - Nov 10 2014

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Keywords

  • Electrocatalysis
  • MWNTs
  • Oxygen reduction reaction
  • Polynitrogen

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