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Iron Oxide Nanoparticle-Encapsulated CNT Branches Crown on 3D Ozonated CNT Internetworks for Lithium-Ion Battery Anodes

机译:氧化铁纳米粒子包裹的CNT分支在3D臭氧化CNT锂离子电池阳极互联网上冠冕

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摘要

Multidimensional hierarchical architecturing is a promising chemical approach to provide unique characteristics synergistically integrated from individual nanostructured materials for energy storage applications. Herein, hierarchical complex hybrid architectures of CNT-on-OCNT-Fe are reported, where iron oxide nanoparticles are encapsulated inside carbon nanotube (CNT) branches grown onto the ozone-treated surface of 3D CNT internetworked porous structures. The activated surface of the 3D ozonated CNT (OCNT) interacts with the iron oxide nanoparticles, resulting in different chemical environments of inner and outer tubes and large surface area. The mixed phases of iron oxide nanoparticles are confined by full encapsulation inside the conductive nanotubes and act as catalysts to vertically grow the CNT branches. This unique hierarchical architecture allows CNT-on-OCNT-Fe to achieve a reasonable capacity of 798 mA h g(-1) at 50 mA g(-1), with outstanding rate capability (approximate to 72% capacity retention at rates from 50 to 1000 mA g(-1)) and cyclic stability (98.3% capacity retention up to 200 cycles at 100 mA g(-1) with a coulombic efficiency of 97%). The improved rate and cyclic capabilities are attributed to the hierarchical porosity of 3D OCNT internetworks, the shielding of CNT walls for encapsulated iron oxide nanoparticles, and a proximate electronic pathway for the isolated nanoparticles.
机译:多维层次结构设计是一种有前途的化学方法,可提供与单个纳米结构材料协同集成的独特特性,用于能量存储应用。在本文中,报道了CNT-on-OCNT-Fe的分层复杂混合体系结构,其中氧化铁纳米颗粒封装在生长到3D CNT互联多孔结构的臭氧处理表面上的碳纳米管(CNT)分支内。 3D臭氧化CNT(OCNT)的活化表面与氧化铁纳米颗粒相互作用,导致内管和外管的化学环境不同,并且表面积较大。氧化铁纳米颗粒的混合相通过完全封装在导电纳米管内而被限制,并充当垂直生长CNT分支的催化剂。这种独特的层次结构使CNT-on-OCNT-Fe在50 mA g(-1)时可达到> 798 mA hg(-1)的合理容量,并具有出色的速率能力(在50速率下,容量保持率约为72%)到1000 mA g(-1))和循环稳定性(在100 mA g(-1)时库仑效率> 97%时,在200个循环中的容量保持率高达98.3%)。速率和循环能力的提高归因于3D OCNT互联网络的层级孔隙度,对封装的氧化铁纳米颗粒的CNT壁的屏蔽以及对分离的纳米颗粒的邻近电子路径。

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