期刊
CARBON
卷 171, 期 -, 页码 320-328出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.09.005
关键词
Hollow carbon polyhedron; Nitrogen-doping; ZIF-8; NaCl; Catalyst; Oxygen reduction reaction
资金
- National Natural Science Foundation of China [51972220, 51572181]
- National Key Research and Development Program of China [2016YFB0100200]
- ERDF program Institute of Environmental TechnologydExcellent Research [CZ.02.1.01/0.0/0.0/16_019/0000853]
- Sino-German Research Institute [GZ 1400]
The study demonstrated the synthesis of nitrogen-doped hollow carbon polyhedrons with exceptional ORR electrocatalytic activity and long-term stability, providing a new approach for designing high-performance electrocatalysts.
The sluggish kinetics of oxygen reduction reaction (ORR) seriously restrains the practical implementation of fuel cells and metal-air batteries (MABs). While, Pt-based catalysts are well proven to be effective for the ORR process, they are rather expensive. Therefore, it is critical to developing low-cost and advanced catalysts with a rationally designed structure and abundant reactive sites as alternatives for Pt-based catalysts. Herein, nitrogen-doped hollow carbon polyhedrons (NHCP) have been fabricated by directly pyrolyzing ZIF-8, templated by NaCl. Benefiting from their hollow porous structure, large surface area, high graphitization degree and desired nitrogen bonding type, the as-synthesized NHCP exhibits exceptional ORR electrocatalytic activity with a half-wave potential (E-1/2) of 0.86 V, high selectivity and outstanding long-term stability, exceeding most reported nitrogen-doped metal-free carbon electrocatalysts. Furthermore, the assembled Zn-air battery with NHCP cathode delivers a peak power density of 272 mW cm(-2), a specific capacity of 740 mAh g(-1) and an operation period of 160 h. This contribution provides a new avenue for designing high-performance electrocatalysts for ORR. (C) 2020 Elsevier Ltd. All rights reserved.
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