Influence of arc duration time on the synthesis of carbon nanohorns by a gas-injected arc-in-water system: application to polymer electrolyte fuel cell electrodes
Influence of arc duration time on the synthesis of carbon nanohorns by a gas-injected arc-in-water system: application to polymer electrolyte fuel cell electrodes
复制标题
DOI：
10.1088/0963-0252/20/3/034002
复制
发表时间：
2011-06
影响因子：
3.8
通讯作者：
N. Sano;Tatsuo Suzuki;K. Hirano;Y. Akita;H. Tamon
中科院分区：
文献类型：
--
作者：
N. Sano;Tatsuo Suzuki;K. Hirano;Y. Akita;H. Tamon
采用水包气体电弧法（GI-AIW）可以低成本地制备单壁碳纳米角（SWCNH）。本研究揭示了电弧放电持续时间对SWCNH产率的影响，在使用这种方法的合成。结果表明，SWCNH的产率随电弧放电持续时间的增加而增加，同时观察到电弧等离子体温度的增加。该结果可以通过考虑反应区的温度升高可以导致碳自由基密度的增加来解释，这可以积极地影响生产产率。这里，产生连续和离散两种电弧放电模式，从而可以比较具有相同放电电流的不同温度的模式。从这项调查中，有人建议，过量的离子密度可能会导致SWCNH生产的减少。当采用GI-AIW方法以连续电弧模式优化电弧放电电流时，生长的SWCNH具有高的比表面积。这样的产物可以以高分散性负载Pt催化剂，导致在聚合物电解质燃料电池中作为催化剂层的高性能。
Single-walled carbon nanohorns (SWCNH) can be synthesized by a gas-injected arc-in-water (GI-AIW) method at low cost. This study revealed the influence of arc discharge duration time on the yield of SWCNH in the synthesis using this method. As a result, the yield of SWCNH increased with the arc discharge duration time, while an increase in arc plasma temperature was observed. This result can be explained by considering that the increased temperature of the reaction zone can lead to an increase in carbon radical density, which can positively affect the production yield. Here, two arc discharge modes, continuous and discrete, were generated so that modes having different temperatures with the same discharge current could be compared. From this investigation, it was suggested that an excessive ion density may cause a decrease in SWCNH production. The as-grown SWCNH possessed a high specific surface area when the arc discharge current was optimized with continuous arc mode using the GI-AIW method. Such a product can support Pt catalyst with high dispersivity, leading to high performance in polymer electrolyte fuel cells as catalyst layers.