Back to Search
Start Over
Boosting oxygen reduction catalysis with tailorable active-N-dominated doped defective CNTs.
- Source :
-
Applied Surface Science . Jan2020, Vol. 499, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- Controlled doping of specific N species is considered to be an effective yet a challenging strategy to boost the ORR performance of the N-doped carbon. Herein, we report a facile synthesis of tailored active-N-dominated doped defective carbon nanotube (CNT) catalysts by in-situ pyrolysis of defective CNT (OCNT) coated with cobalt(II) ions in ammonia atmosphere. With the guidance of defects and cobalt(II) ions, more active N species (pyridinic-N, graphitic-N and Co-N x) related to ORR activity are inductively doped into the OCNT forming the active-N-dominated doped OCNT-N catalyst. The resulting OCNT-N shows more favorable ORR activity with an onset potential of 0.94 V vs. RHE, half-wave potential of 0.82 V vs. RHE and better selectivity toward four electron path of ORR due to the synergistic effect of these active nitrogen species and structural defects. Most encouragingly, the according Zn-air batteries using OCNT-N as cathode catalysts can achieve a peak power density of 170.2 mW cm−2 and show a slight voltage loss of only 0.86% after continuous discharge for 12 h at 10 mA cm−2. Our findings demonstrate that the resulting synergy of active N species induced by defects and cobalt(II) ions and defect sites considerably may contribute to boost ORR catalytic activity. Unlabelled Image • Pre-oxidization renders carbon nanotubes more structural defects liable to N doping. • More oxygen functional groups related to defects induce the doping of active nitrogen species. • A tailored active-N-dominated doped CNT prepared by pyrolysis of OCNT coated with Co2+ in ammonia atmosphere. • Defects tailored N-doped CNT shows enhanced activity toward ORR. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 499
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 141580707
- Full Text :
- https://doi.org/10.1016/j.apsusc.2019.143844