期刊
NANO-MICRO LETTERS
卷 12, 期 1, 页码 -出版社
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-019-0364-z
关键词
Porous carbon; Ball milling; Nitrogen doping; Oxygen reduction reaction; Zn-air battery; Supercapacitor
资金
- NSFC [51602332]
- National Key Research and Development Program of China [2016YFB0700204]
- Science and Technology Commission of Shanghai Municipality [15520720400, 16DZ2260603]
- Equipment Research Program [6140721050215]
- Ningbo 3315 program
- DST Solar Energy Harnessing Centre [DST/TMD/SERI/HUB/1(C)]
- DST Materials for Energy Storage program, Ministry of Electronics and Information Technology (India) [ELE1819353MEITNAK]
Nitrogen-doped carbon materials with a large specific surface area, high conductivity, and adjustable microstructures have many prospects for energy-related applications. This is especially true for N-doped nanocarbons used in the electrocatalytic oxygen reduction reaction (ORR) and supercapacitors. Here, we report a low-cost, environmentally friendly, large-scale mechanochemical method of preparing N-doped porous carbons (NPCs) with hierarchical micro-mesopores and a large surface area via ball-milling polymerization followed by pyrolysis. The optimized NPC prepared at 1000 degrees C (NPC-1000) offers excellent ORR activity with an onset potential (E-onset) and half-wave potential (E-1/2) of 0.9 and 0.82 V, respectively (vs. a reversible hydrogen electrode), which are only approximately 30 mV lower than that of Pt/C. The rechargeable Zn-air battery assembled using NPC-1000 and the NiFe-layered double hydroxide as bifunctional ORR and oxygen evolution reaction electrodes offered superior cycling stability and comparable discharge performance to RuO2 and Pt/C. Moreover, the supercapacitor electrode equipped with NPC prepared at 800 degrees C exhibited a high specific capacity (431 F g(-1) at 10 mV s(-1)), outstanding rate, performance, and excellent cycling stability in an aqueous 6-M KOH solution. This work demonstrates the potential of the mechanochemical preparation method of porous carbons, which are important for energy conversion and storage.
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