Journal
CARBON
Volume 173, Issue -, Pages 715-723Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.11.053
Keywords
Carbon nanocages; Nitrogen doping; Large lattice spacing; Bifunctional oxygen electrocatalyst; Zn-air battery
Funding
- National Post-doctoral Program of China [2018M632600]
- Natural Science Foundation of Jiangxi Province [20192BAB216006]
- Project of Education Department of Jiangxi Province [GJJ160649]
- High-Level talent funds [3401223254]
- Doctoral startup fund [3401223242, 3203304894]
- Program of Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology [JXUSTQJYX2019010]
- University of Cincinnati through the Herman Schneider Professorship in the College of Engineering and Applied Sciences
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The novel nitrogen-doped carbon nanocage N-CNC-900 shows high activity and stability for oxygen reduction and oxygen evolution reactions. It exhibits low overpotential for OER and a large half-wave potential for ORR, making it promising for applications in metal-air batteries.
The development of highly active, inexpensive, and stable bifunctional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalysts to replace noble metal Pt and RuO2 catalysts remains a considerable challenge for highly demanded reversible fuel cells and metal-air batteries. Herein, a novel nitrogen doped carbon nanocage (N-CNC-900) is fabricated via facile carbonization of bimetal-organic framework (BMOF). The newly obtained N-CNC-900 catalyst is featured by multiple carbon layers with a wide lattice spacing of 0.434 nm and the aperture of approximate 10 nm, ultrahigh specific surface area and abundant N doping amount as well. As results, the optimized N-CNC-900 exhibits a low overpotential of 1.52 V toward OER at a current density of 10 mA/cm(2), and also show a large half-wave potential of 0.90 V for ORR, respectively. High activity and stability toward the bifunctional oxygen electrocatalysis are also demonstrated on the N-CNC-900. When explored as air cathode for rechargeable Zn-air battery, a high open-circuit voltage (1.54 V) and long-term stability (after cycling 200 h) can be realized, outperforming the commercial Pt/C + RuO2 association. This outstanding performance can be attributed to improved reaction kinetics of both ORR and OER, which originates from the enlarged lattice spacing in the few-layer conductive carbon nanocage structure and the existing metal-nitrogen-carbon (M-N-x-C). These results forebode the optimized N-CNC-900 presenting a promising application in metal-air batteries, as well the lattice modulation of carbon materials providing a novel approach for designing advanced electrocatalysts. (C) 2020 Elsevier Ltd. All rights reserved.
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