Constructing an interface synergistic effect from a SnS/MoS2 heterojunction decorating N, S co-doped carbon nanosheets with enhanced sodium ion storage performance
Constructing an interface synergistic effect from a SnS/MoS2 heterojunction decorating N, S co-doped carbon nanosheets with enhanced sodium ion storage performance
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构建具有增强钠离子存储性能的N、S共掺杂碳纳米片的SnS/MoS2异质结的界面协同效应
DOI：
10.1039/d0ta08858g
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发表时间：
2020-11-21
影响因子：
11.9
通讯作者：
Li, Qingyu
中科院分区：
文献类型：
--
作者：
Cui, Lisan;Tan, Chunlei;Li, Qingyu
硫化锡（SnS）作为钠离子电池（SIB）的负极材料，因其具有高容量和独特的二维结构等优点而备受关注。但由于SnS的体积变化大、本征电导率低，导致其电化学性能较差，严重限制了其在SIB中的实际应用。在此，我们成功地构建了修饰N，S共掺杂碳纳米片（SnS/MoS 2/NS-CN s）的硫化SnS/MoS 2异质结构作为SIB的阳极材料。所设计的SnS/MoS 2异质结构在纳米晶体内诱导电场，这导致较低的离子扩散电阻并促进界面电子传输。此外，N，S共掺杂的碳纳米片可以缓冲SnS/MoS 2的体积变化，避免SnS/MoS 2与电解质的直接接触，同时具有良好的电子和离子输运动力学。因此，得益于这些优点，所制备的SnS/MoS 2/NS-CN表现出出色的倍率性能（5.0 A g-1下为372.9 mA h g-1）和长期循环性能（1.0 A g-1下800次循环后为287.2 mA h g-1）。
Tin sulfide (SnS) has attracted much attention as an anode material for sodium ion batteries (SIBs) because of its various advantages, including high capacity and unique 2D structure. However, SnS has poor electrochemical performance caused by the large volume change and low intrinsic electric conductivity, which seriously limited its practical application in SIBs. Herein, we successfully constructed bimetallic sulfide SnS/MoS2 heterostructures decorating N, S co-doped carbon nanosheets (SnS/MoS2/NS-CNs) as anode materials for SIBs. The designed SnS/MoS2 heterostructures induce an electric field within the nanocrystals, which lead to lower ion-diffusion resistance and facilitate interfacial electron transport. Moreover, the N, S co-doped carbon nanosheets can buffer the volume change of SnS/MoS2, avoiding the direct contract between SnS/MoS2 and electrolyte, as well as favorable transport kinetics for electrons and ions. Accordingly, benefiting from these merits, the as-prepared SnS/MoS2/NS-CNs exhibit outstanding rate capability (372.9 mA h g−1 at 5.0 A g−1) and long-term cycling performance (287.2 mA h g−1 after 800 cycles at 1.0 A g−1).