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首页> 外文期刊>Applied Surface Science >High electrochemical sodium storage performance of ZnSe/CoSe@N-doped porous carbon synthesized by the in-situselenization of ZIF-8/67 polyhedron
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High electrochemical sodium storage performance of ZnSe/CoSe@N-doped porous carbon synthesized by the in-situselenization of ZIF-8/67 polyhedron

机译：通过ZIF-8/67多面体的原位烯化合成的ZnSe / COSE @ N掺杂多孔碳的高电化学钠储存性能

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摘要

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.
机译：双金属硒化硒（ZnSe / COSE）嵌入n掺杂的碳菱形十二锭中，用作钠离子电池（SIB）阳极。金属有机框架（MOF）前体（ZIF-8/67）通过在特定温度下以原位热解和硒化方法形成中空结构（用ZnSe / COSE @ NPC表示）。我们的硒化物具有非常好的电化学钠储存性能。在200旋转后，在0.1Ag（-1）的417.6mahg（-1）下保持在417.6mahg（-1）的417.6mahg（-1）的ZnSe / COSE @ NPC纳米复合电极的容量。关于速率容量，ZnSe / COSE @ NPC纳米复合电极的容量为460.8,415.6,359.9,346.3,318.0,274.1和236.4mahg（-1），不同电流密度为0.1,0.2,0.5,1,2，分别为5和10a g（-1）。在高电流密度下，还获得ZnSe / COSE @ NPC纳米复合电极的稳定性，并且在高电流密度为1Ag（-1）的900次循环之后，电极可以保持稳定的可逆容量为303.9mahg（ -1）。此外，ZnSe / COSE @ NPC纳米复合材料的电化学NA +储存行为的动力学分析表明，外部假偶联机导致优异的性能和优异的长循环稳定性。本研究提出了一种用于合成用于制造预期能量存储装置的多分量中空结构的新策略。

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