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- Title
N<sub>8</sub><sup>-</sup> Polynitrogen Stabilized on Multi-Wall Carbon Nanotubes for Oxygen-Reduction Reactions at Ambient Conditions.
- Authors
Zhiyi Wu; Benchafia, El Mostafa; Iqbal, Zafar; Xianqin Wang
- 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.
- Subjects
MULTIWALLED carbon nanotube synthesis; POLYNITROGENS; NITROGEN spectra; ELECTROCATALYSIS; OXYGEN reduction; AMBIENT conditions (Electronics); CYCLIC voltammetry
- Publication
Angewandte Chemie, 2014, Vol 126, Issue 46, p12763
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201403060