High-Power Supercapacitor Electrodes from Single-Walled Carbon Nanohorn/Nanotube Composite
High-Power Supercapacitor Electrodes from Single-Walled Carbon Nanohorn/Nanotube Composite
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DOI：
10.1021/nn1017457
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发表时间：
2011-02-01
期刊：
影响因子：
17.1
通讯作者：
Hata, Kenji
中科院分区：
文献类型：
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作者：
Izadi-Najafabadi, Ali;Yamada, Takeo;Hata, Kenji
本发明提供了一种新型复合材料作为超级电容器电极，其具有超过其他电极的功率性能的高最大额定功率（990 kW/kg; 396 kW/l）。电极的高功率能力源于其独特的介孔-大孔结构，该结构通过利用单壁碳纳米管（20重量%）作为单壁碳纳米角（80重量%）的支架而设计。新型复合电极还表现出耐用的操作（6.5%的下降电容超过100 000次循环），作为其整体的化学组成和机械稳定性的结果。该新型复合电极与另一种由单壁碳纳米管制成的高功率电极（巴基纸电极）进行了基准测试。虽然复合电极与Bucky纸电极相比具有较低的表面积（280对470 m2/g，来自氮气吸附），其具有更高的介孔-大孔体积（2.6对1.6 mL/g，来自压汞法），这使得复合电极能够保留更多的电解质，确保容易的离子传输，因此实现更高的最大额定功率（970对400 kW/kg）。
A novel composite Is presented as a supercapacitor electrode with a high maximum power rating (990 kW/kg; 396 kW/l) exceeding power performances of other electrodes. The high-power capability of the electrode stemmed from its unique meso-macro pore structure engineered through the utilization of single-walled carbon nanotubes (20 wt %) as scaffolding for single-walled carbon nanohorns (80 wt %). The novel composite electrode also exhibited durable operation (6.5% decline In capacitance over 100 000 cycles) as a result of its monolithic chemical composition and mechanical stability. The novel composite electrode was benchmarked against another high-power electrode made from single-walled carbon nanotubes (Bucky paper electrode). While the composite electrode had a lower surface area compared to the Bucky paper electrode (280 vs 470 m(2)/g from nitrogen adsorption), it had a higher meso-macro pore volume (2.6 vs 1.6 mL/g from mercury porosimetry) which enabled the composite electrode to retain more electrolyte, ensuring facile ion transport, hence achieving a higher maximum power rating (970 vs 400 kW/kg).