Heterostructure engineering of electrode materials, which is expected to accelerate the ion/electron transport rates driven by a built-in internal electric field at the heterointerface, offers unprecedented promise in improving their cycling stability and rate performance. Herein, carbon nanotubes with Co9 S8 /ZnS heterostructures embedded in a N-doped carbon framework (Co9 S8 /ZnS@NC) have been rationally designed via an in-situ vapor chemical transformation strategy with the aid of thiophene, which not only acted as carbon source for the growth of carbon nanotubes but also as sulfur source for the sulfurization of metal Zn and Co. Density functional theory (DFT) calculation shows an about 3.24 eV electrostatic potential difference between ZnS and Co9 S8 , which results in a strong electrostatic field across the interface that makes electrons transfer from Co9 S8 to the ZnS side. As expected, a stable cycling performance with reversible capacity of 411.2 mAh g-1 at 1000 mA g-1 after 300 cycles, excellent rate capability (324 mAh g-1 at 2000 A g-1 ) and a high percentage of pseudocapacitance contribution (87.5% at 2.2 mv/s) for lithium-ion batteries (LIBs) are achieved. This work provides a possible strategy for designing multicomponent heterostructural materials for application in energy storage and conversion fields.

中文翻译：

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双金属有机框架衍生的Co9 S8 / ZnS @ NC异质结构，可实现出色的锂离子存储。

电极材料的异质结构工程有望通过异质界面上的内置内部电场来驱动离子/电子传输速率，为提高其循环稳定性和速率性能提供了空前的希望。在本文中，借助噻吩通过原位气相化学转化策略，合理设计了嵌入Co掺杂的碳骨架中的Co9 S8 / ZnS异质结构的碳纳米管（Co9 S8 / ZnS @ NC）。碳源可用于碳纳米管的生长，也可作为硫源用于金属Zn和Co的硫化。密度泛函理论（DFT）计算显示ZnS和Co9 S8之间的静电势差约为3.24 eV，这会在界面上产生强静电场，使电子从Co9 S8转移到ZnS侧。如预期的那样，具有稳定的循环性能，经过300次循环后在1000 mA g-1下具有411.2 mAh g-1的可逆容量，出色的倍率能力（在2000 A g-1时为324 mAh g-1）和较高的伪电容贡献率（对于锂离子电池（LIB），在2.2 mv / s时达到87.5％。这项工作为设计用于能量存储和转换领域的多组分异质结构材料提供了一种可能的策略。锂离子电池（LIB）达到2 mv / s）。这项工作为设计用于能量存储和转换领域的多组分异质结构材料提供了一种可能的策略。锂离子电池（LIB）达到2 mv / s）。这项工作为设计用于能量存储和转换领域的多组分异质结构材料提供了一种可能的策略。