Abstract Bimetallic selenide (ZnSe / CoSe) was embedded in N-doped carbon rhombic dodecahedron and used as a sodium ion battery (SIB) anode. Metal organic framework (MOF) precursors (ZIF-8 / 67) form hollow structures (denoted as ZnSe/CoSe@NPC)through in situ pyrolysis and selenization processes at specific temperatures. Our selenides have very good electrochemical sodium storage properties. After 200circulation, the capacity of the as-prepared ZnSe/CoSe@NPC nanocomposite electrode was maintained at 417.6 mAh g−1 at 0.1 A g−1. Regarding rate capacity, the capacities of ZnSe/CoSe@NPC nanocomposite electrode are of 460.8, 415.6, 359.9, 346.3, 318.0, 274.1 and 236.4 mAh g−1 at different current densities of 0.1, 0.2, 0.5, 1, 2, 5 and 10 A g−1, respectively. The stability of the ZnSe/CoSe@NPC nanocomposite electrode at high current density is also obtained, and after 900 cycles at a high current density of 1 A g−1, the electrode can maintain a stable reversible capacity of 303.9 mAh g−1. Besides, kinetic analysis of the electrochemical Na+ storage behaviour of the ZnSe/CoSe@NPC nanocomposite shows that the external pseudocapacitor results in excellent rate performance and excellent long-cycle stability. This study proposes a new strategy for synthesizing multi-component hollow structures for the manufacture of intended energy storage devices.

中文翻译：

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ZIF-8/67多面体原位化合成ZnSe/CoSe@N掺杂多孔碳的高电化学储钠性能

摘要 双金属硒化物 (ZnSe / CoSe) 嵌入在 N 掺杂的碳菱形十二面体中，用作钠离子电池 (SIB) 负极。金属有机骨架 (MOF) 前体 (ZIF-8 / 67) 通过在特定温度下的原位热解和硒化过程形成中空结构（表示为 ZnSe/CoSe@NPC）。我们的硒化物具有非常好的电化学钠储存特性。循环 200 次后，所制备的 ZnSe/CoSe@NPC 纳米复合电极的容量在 0.1 A g-1 时保持在 417.6 mAh g-1。关于倍率容量，ZnSe/CoSe@NPC纳米复合电极在0.1、0.2、1、5、0.25不同电流密度下的容量分别为460.8、415.6、359.9、346.3、318.0、274.1和236.4 mAh g-1。分别为 10 A g-1。还获得了ZnSe/CoSe@NPC纳米复合电极在高电流密度下的稳定性，在1 A g-1的高电流密度下循环900次后，该电极可以保持303.9 mAh g-1的稳定可逆容量。此外，ZnSe/CoSe@NPC纳米复合材料的电化学Na+存储行为的动力学分析表明，外部赝电容器具有优异的倍率性能和优异的长循环稳定性。这项研究提出了一种合成多组分中空结构以制造预期储能装置的新策略。ZnSe/CoSe@NPC 纳米复合材料的电化学 Na+ 存储行为的动力学分析表明，外部赝电容器具有优异的倍率性能和优异的长循环稳定性。这项研究提出了一种合成多组分中空结构以制造预期储能装置的新策略。ZnSe/CoSe@NPC 纳米复合材料的电化学 Na+ 存储行为的动力学分析表明，外部赝电容器具有优异的倍率性能和优异的长循环稳定性。这项研究提出了一种合成多组分中空结构以制造预期储能装置的新策略。