Synergistical Coupling Interconnected ZnS/SnS2 Nanoboxes with Polypyrrole-Derived N/S Dual-Doped Carbon for Boosting High-Performance Sodium Storage
Synergistical Coupling Interconnected ZnS/SnS2 Nanoboxes with Polypyrrole-Derived N/S Dual-Doped Carbon for Boosting High-Performance Sodium Storage
复制标题
协同耦合互连 ZnS/SnS2 纳米盒与聚吡咯衍生的 N/S 双掺杂碳，用于增强高性能钠存储
DOI：
10.1002/smll.201804861
复制
发表时间：
2019-03-01
期刊：
影响因子：
13.3
通讯作者：
Zhang, Jiafeng
中科院分区：
文献类型：
--
作者：
Cao, Liang;Zhang, Bao;Zhang, Jiafeng
金属硫化物由于其高比容量的钠存储能力而具有巨大的潜力。然而，在连续循环过程中，巨大的体积膨胀伴随着结构的崩塌和不满意的电导率，往往导致倍率性能下降和严重的循环衰落。本工作采用简单的共沉淀法制备了N/S双掺杂碳壳结构的二元金属硫化物纳米盒(ZSS@NSc)，包括聚吡咯包裹和原位硫化。通过在异质界面上产生电场，这种精心设计的硫化锌和SnS2之间的异质性提供了快速的Na+插入和增强的电荷传输。更重要的是，聚吡咯衍生的N/S双掺杂碳的形成与硫化锌/硫化锡协同作用形成了一个独特的、坚固的结构，进一步加强了异质界面的互连功能，改善了电子/离子转移，缓解了长期循环过程中的体积变化。其中，所制备的ZSS@NSC具有良好的比容量、优良的倍率性能和优异的循环稳定性(可逆容量为456.2 mAg(-1)，在5A g(-1)的超高倍率下700次稳定循环后容量保持率为97.2%)。储能性能的提高表明，结构工程优化策略对储能应用具有广阔的推广前景。
Metal sulfides possess tremendous potentials owing to their high specific capacity for sodium storage. However, the huge volume expansion, accompanied with structural collapse and unsatisfied electric conductivity upon continuous cycling, always lead to inferior rate capability and severe cycling fading. In this work, binary metal sulfide (ZnS/SnS2) nanoboxes confined in N/S dual-doped carbon shell (ZSS@NSC) are fabricated through a facile co-precipitation method involving the wrapping of polypyrrole, and subsequent in situ sulfidation process. Such a well-designed heterogeneity between ZnS and SnS2 provides rapid Na+ insertion and enhanced charge transport by creating an electric field at the heterointerface. More significantly, the formation of polypyrrole-derived N/S dual-doped carbon is synergistically coupled with the ZnS/SnS2 to create a unique and robust architecture, further strengthening the interconnect function at the heterointerface, which improves electric/ion transfer and mitigates the volume variation during the long-term cycling process. Herein, this as-prepared ZSS@NSC exhibits satisfied specific capacity, excellent rate property, and superior cyclic stability (a reversible capacity of 456.2 mAh g(-1) with excellent capacity retention of 97.2% after 700 stable cycles at ultrahigh rate of 5 A g(-1)). The boosted Na-storage properties demonstrate that the optimized strategy of structure-engineering has a broad prospect to promote energy storage applications.