Abstract Layered SnS2 has attracted extensive attention as promising anode material for sodium-ion storage owing to its high theoretical specific capacity. However, the practical performance is always hindered by its inferior rate capability and severe capacity fading. Herein, a novel coherent SnS2/NiS2 hetero-nanosheet arrays on carbon cloth (SnS2/NiS2@CC) is fabricated through a facile one-step solvothermal method by controlling the synchronous growth of SnS2 and NiS2. Benefiting from the strong coupling effect between SnS2 and NiS2, and thus the markedly elevated electrical conductivity and charge transfer rate for sodiation/desodiation reaction, such composite exhibits significantly enhanced performance than its pure SnS2 counterpart as the anode for sodium-ion battery, presenting a high reversible capacity (909.2 mA h g−1 of the fifth cycle at 200 mA g−1), excellent rate capability (360 mA h g−1 at 5 A g−1) and satisfying cycling stability (588.9 and 343.2 mA h g−1 at 0.5 and 2 A g−1 after 100 cycles, respectively). Moreover, the measured Na+ diffusion coefficient for such SnS2/NiS2@CC electrode is almost two orders of magnitude higher than that of pure SnS2@CC. Such heterogeneous structuring for enhancing the rate performance could offer an effectively alternative way for the development of advanced electrode materials for energy storage devices.

中文翻译：

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具有快速电荷转移的相干 SnS2/NiS2 异质纳米片阵列，用于增强钠离子存储

摘要 层状SnS2作为一种有前景的钠离子存储负极材料因其高理论比容量而受到广泛关注。然而，其较差的倍率能力和严重的容量衰减一直阻碍了实际性能。在此，通过控制 SnS2 和 NiS2 的同步生长，通过简便的一步溶剂热法制备了一种新型的碳布上相干的 SnS2/NiS2 异质纳米片阵列（SnS2/NiS2@CC）。受益于 SnS2 和 NiS2 之间的强耦合效应，从而显着提高了钠化/脱钠反应的电导率和电荷转移速率，这种复合材料比纯 SnS2 对应物作为钠离子电池的阳极表现出显着增强的性能，呈现出高可逆容量（909. 2 mA hg-1，200 mA g-1），优异的倍率性能（5 A g-1 时为 360 mA hg-1）并满足循环稳定性（0.5 和 2 A 时为 588.9 和 343.2 mA hg-1） g-1 分别在 100 次循环后）。此外，测得的这种 SnS2/NiS2@CC 电极的 Na+ 扩散系数几乎比纯 SnS2@CC 高两个数量级。这种用于提高倍率性能的异质结构可以为开发用于储能设备的先进电极材料提供有效的替代方法。测得的这种 SnS2/NiS2@CC 电极的 Na+ 扩散系数比纯 SnS2@CC 高出几乎两个数量级。这种用于提高倍率性能的异质结构可以为开发用于储能设备的先进电极材料提供有效的替代方法。测得的这种 SnS2/NiS2@CC 电极的 Na+ 扩散系数比纯 SnS2@CC 高出几乎两个数量级。这种用于提高倍率性能的异质结构可以为开发用于储能设备的先进电极材料提供有效的替代方法。