W Clusters In Situ Assisted Synthesis of Layered Carbon Nanotube Arrays on Graphene Achieving High-Rate Performance
W Clusters In Situ Assisted Synthesis of Layered Carbon Nanotube Arrays on Graphene Achieving High-Rate Performance
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W簇原位辅助合成石墨烯上的层状碳纳米管阵列，实现高性能
DOI：
10.1021/acsami.1c01196
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发表时间：
2021
影响因子：
9.5
通讯作者：
Zhao Naiqin
中科院分区：
文献类型：
--
作者：
Li Yue;Sha Junwei;Sui Simi;Salvatierra Rodrigo V;Ma Liying;Shi Chunsheng;Liu Enzuo;He Chunnian;Zhao Naiqin
采用热丝辅助化学气相沉积(HFCVD)技术，在液态二元Fe_3O_4/Al_2O_3催化剂上制备了层状垂直排列碳纳米管阵列(VACNTs)。利用热的钨丝在Fe催化剂上蒸发W原子并形成W团簇，对层状VACNT阵列的生长有很大的影响。在碳纳米管生长过程中，随着更多W团簇的沉积，Fe催化剂的迁移和Ostwald熟化立即受到抑制。通过控制W团簇的沉积，所制备的层状VACNT阵列作为离子基超级电容器的电极，其电化学储能性能也是可调的。由于选择了合适的热丝条件(55W，90 S)，层状VACNT阵列可以达到83.1mF cm-2的高容量，并具有良好的倍率性能。这项工作为深入了解W丝在HFCVD过程中的行为，以及在保持催化剂的催化活性和结构的情况下生成的W团簇在碳纳米管生长中的重要作用提供了一个新的视角。
W atoms/clusters are employed toin situassist the development of layered vertically aligned carbon nanotube arrays (VACNTs) through hot-filament-assisted chemical vapor deposition (HFCVD) with liquid binary Fe3O4/AlOxcatalysts. The hot W filament was utilized toin situevaporate atomic W and form W clusters on Fe catalysts, which have a strong impact on the growth of layered VACNT arrays. The migration and Ostwald ripening of Fe catalysts are found to be suppressed immediately with more W clusters deposition during CNT growth. Through controlling the deposition of W clusters, the electrochemical energy storage performance of as-prepared layered VACNT arrays is also tunable as electrodes of ion-based supercapacitors. The layered VACNT arrays can achieve a high capacity of 83.1 mF cm–2and possess desirable rate performance due to the suitable hot filament condition (55 W for 90 s). This work provides a new perspective to in-depth understand the behavior of W filament during HFCVD and the significant role of thein situgenerated W clusters on the growth of CNTs by maintaining the catalytic activity and structure of catalysts.