Constructing heterostructure is a valid method to reinforcing sodium storage performance of transition metal chalcogenides materials. Herein, a simple, safe and controllable one step hydrothermal method is proposed to synthesize MoS2/NiS2 heterostructure. Due to the difference in band gaps and work functions of MoS2 and NiS2, the charges are redistributed at the MoS2/NiS2 heterointerfaces, thereby accelerating the migration of electrons and Na+. The heterointerfaces provide extra active sites for storing Na+, thus increasing the sodium storage capacity of the heterostructure. Furthermore, the distinct redox potentials of NiS2 and MoS2 promote the structural stability of MoS2/NiS2 heterostructure during the electrochemical reaction processes. Consequently, the obtained MoS2/NiS2 heterostructure exhibits superior rate properties (339.4 mAh g−1 at 10 A g−1) and ultra-stable cycling stability (480.5 mAh g−1 after 350 cycles at 1 A g−1). This paper presents a valid strategy for creating heterostructure anodes with excellent sodium storage properties.

中文翻译：

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具有快速界面反应动力学的MoS2/NiS2异质结构的构建用于超快钠存储


构建异质结构是增强过渡金属硫系材料储钠性能的有效方法。本文提出了一种简单、安全、可控的一步水热法来合成MoS2/NiS2异质结构。由于MoS2和NiS2的带隙和功函数的差异，电荷在MoS2/NiS2异质界面处重新分布，从而加速电子和Na+的迁移。异质界面为储存Na+提供了额外的活性位点，从而增加了异质结构的钠储存能力。此外，NiS2和MoS2不同的氧化还原电位促进了电化学反应过程中MoS2/NiS2异质结构的结构稳定性。因此，所获得的MoS2/NiS2异质结构表现出优异的倍率性能（在10 A g-1下为339.4 mAh g-1）和超稳定的循环稳定性（在1 A g-1下循环350次后为480.5 mAh g-1）。本文提出了一种创建具有优异钠存储性能的异质结构阳极的有效策略。