Journal
NANO RESEARCH
Volume 14, Issue 12, Pages 4541-4547Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-021-3369-0
Keywords
single atoms; Fe-N-C sites; carbon nanotube; bifunctional electrocatalyst; zinc-air batteries
Categories
Funding
- Ministry of Science and Technology of China [2016YFA0201904]
- National Natural Science Foundation of China [21631002]
- Beijing National Laboratory for Molecular Sciences [BNLMS-CXTD-202001]
- Shenzhen Basic Research Project [JCYJ20170817113121505]
- Shenzhen KQTD Project [KQTD20180411143400981]
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The fabrication of Fe-N-C catalysts supported by carbon nanotubes enhances the activity of bifunctional electrocatalysts for oxygen reduction and evolution reactions, leading to improved performance of rechargeable Zn-air batteries.
Bifunctional electrocatalysts with high activity toward both oxygen reduction and evolution reaction are highly desirable for rechargeable Zn-air batteries. Herein, a kind of carbon nanotube (CNT) supported single-site Fe-N-C catalyst was fabricated via pyrolyzing in-situ grown Fe-containing zeolitic imidazolate frameworks on CNTs. CNTs not only serve as the physical supports of the Fe-N-C active sites but also provide a conductive network to facilitate the fast electron and ion transfer. The as-synthesized catalysts exhibit a half-wave potential of 0.865 V for oxygen reduction reaction and a low overpotential of 0.442 V at 10 mA.cm(-2) for oxygen evolution, which is 310 mV smaller than that of Fe-N-C without CNTs. The rechargeable Zn-air batteries fabricated with such hybrid catalysts display a high peak power density of 182 mW.cm(-2) and an excellent cycling stability of over 1,000 h at 10 mA.cm(-2), which outperforms commercial Pt-C and most of the reported catalysts. This facile strategy of combining single-site Metal-N-C with CNTs network is effective for preparing highly active bifunctional electrocatalysts.
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