Abstract Traditional metal selenide was used as sodium ion battery anode on account of its high specific capacity and large layer spacing. Here, ZnSe/rGO composites are synthesized through a facile one-step hydrothermal method using relatively environmentally friendly raw materials. The obtained ZnSe nanoparticles with a diameter of about 50 nm, which evenly distributed on the three-dimensional graphene sheet. Electrochemical test results show improved performance, under a current density of 100 mA g−1, the capacity can still remain 276.6 mA h g−1 after 100 cycles. For rate performance, when the current density are under 0.1, 0.2, 0.5, 1, 2, 5 and 10 A g−1, the capacity can remain 411.6, 385.9, 340.1, 293.9, 239.4, 179.2 and 119.4 mA h g−1, respectively. Furthermore, under a large current density of 500 mA g−1, it can remain a reversible capacity of 119.4 mA h g−1. In addition, the calculation of pseudocapacitance shows that it is helpful to achieve pleasing rate capability and long cyclic stability. As a result of its high specific surface area and enhanced electronic conductivity, an improved performance can be obtain, furthermore can well alleviate the volume expansion of the composite.

中文翻译：

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纳米结构嵌入石墨烯纳米片中的 ZnSe 提高了钠离子电池负极材料的电化学性能

摘要 传统的金属硒化物因其比容量高、层间距大而被用作钠离子电池负极。在这里，ZnSe/rGO 复合材料是使用相对环保的原材料通过简单的一步水热法合成的。得到直径约50nm的ZnSe纳米颗粒，均匀分布在三维石墨烯片上。电化学测试结果表明性能有所提高，在100 mA g-1的电流密度下，100次循环后容量仍可保持276.6 mA h g-1。对于倍率性能，当电流密度低于 0.1、0.2、0.5、1、2、5 和 10 A g-1 时，容量可以保持为 411.6、385.9、340.1、293​​.9、239.4、179.2 和 119.4 mA hg-1分别。此外，在 500 mA g-1 的大电流密度下，它可以保持 119.4 mAh g-1 的可逆容量。此外，赝电容的计算表明，它有助于实现令人满意的倍率能力和长循环稳定性。由于其高比表面积和增强的电子导电性，可以获得改善的性能，并且可以很好地缓解复合材料的体积膨胀。