期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 25, 页码 10008-10013出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta02793h
关键词
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资金
- 100 Talents Program of the Chinese Academy of Sciences
- National Program on Key Basic Research Project of China (973 Program) [2012CB215500, 2014CB932300]
- National Natural Science Foundation of China [21101147, 21203176, 51301160]
Development of an efficient air cathode for metal-air batteries composed of an element that is abundant on earth is a scientific and technical challenge. Here, nitrogen (N)-doped carbon cathodes were prepared using two conventional doping methods, namely ammonia activation (ammoxidation) and introduction of an N-containing precursor. Interestingly, the introduction of N-containing precursors to prepare the N-doped carbon material not only gave a different pore distribution with increased surface area but also maintained considerable N content, unlike the use of the ammoxidation method - thus greatly enhancing the catalytic activity (low overpotential) and improving the discharge capacity (6905 mA h g(-1)) and cycle life (from 8 to 66 cycles) in sodium-oxygen batteries compared with the pure carbon material. This study also stresses the importance of adopting the optimized synthesis method to prepare the N-doped carbon cathode.
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