期刊
NANOSCALE
卷 9, 期 6, 页码 2178-2187出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr08987a
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类别
资金
- Chinese ministry of science and technology [2016 YFA0200700]
- National Key Basic Research Program of China [2014CB931801]
- National Natural Science Foundation of China [21676093, 21471056, 21473044, 21475029, 91427302]
- Instrument Developing Project of the Chinese Academy of Sciences [YZ201311]
- CAS-CSIRO Cooperative Research Program [GJHZ1503]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA09040100]
Due to their high specific surface area and good electric conductivity, nitrogen-doped porous carbons (NPCs) and carbon nanotubes (CNTs) have attracted much attention for electrochemical energy storage applications. In the present work, we firstly prepared MWCNT/ZIF-8 composites by decoration of zeolitic imidazolate frameworks (ZIF-8) onto the surface of multi-walled CNTs (MWCNTs), then obtained MWCNT/NPCs by the direct carbonization of MWCNT/ZIF-8. By controlling the reaction conditions, MWCNT/ZIF-8 with three different particle sizes were synthesized. The effect of NPCs size on capacitance performance has been evaluated in detail. The MWCNT/NPC with large-sized NPC (MWCNT/NPC-L) displayed the highest specific capacitance of 293.4 F g(-1) at the scan rate of 5 mV s(-1) and only lost 4.2% of capacitance after 10 000 cyclic voltammetry cycles, which was attributed to the hierarchically structured pores, N-doping and high electrical conductivity. The studies of symmetric two-electrode supercapacitor cells also confirmed MWCNT/NPC-L as efficient electrode materials that have good electrochemical performance, especially for high-rate applications.
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