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首页> 外文期刊>Advanced Functional Materials >Constructing CoO/Co_3S_4 Heterostructures Embedded in N-doped Carbon Frameworks for High-Performance Sodium-Ion Batteries
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Constructing CoO/Co_3S_4 Heterostructures Embedded in N-doped Carbon Frameworks for High-Performance Sodium-Ion Batteries

机译：构建高性能N离子电池N掺杂碳框架中嵌入的CoO / Co_3S_4异质结构

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摘要

Heterostructures are attractive for advanced energy storage devices due to their rapid charge transfer kinetics, which is of benefit to the rate performance. The rational and facile construction of heterostructures with satisfactory electrochemical performance, however, is still a great challenge. Herein, ultrafine hetero-CoO/Co3S4 nanoparticles embedded in N-doped carbon frameworks (CoO/Co3S4@N-C) are successfully obtained by employing metal-organic frameworks as precursors. As anodes for sodium ion batteries, the CoO/Co3S4@N-C electrodes exhibit high specific capacity (1029.5 mA h g(-1) at 100 mA g(-1)) and excellent rate capability (428.0 mA h g(-1) at 5 A g(-1)), which may be attributed to their enhanced electric conductivity, facilitated Na+ transport, and intrinsic structural stability. Density functional theoretical calculations further confirm that the constructed heterostructures induce electric fields and promote fast reaction kinetics in Na+ transport. This work provides a feasible approach to construct metal oxide/sulfide heterostructures toward high-performance metal-ion batteries.
机译：异质结构因其快速的电荷转移动力学而对先进的能量存储设备具有吸引力，这有利于速率性能。然而，具有令人满意的电化学性能的异质结构的合理和容易的构造仍然是巨大的挑战。在此，通过采用金属有机骨架作为前驱体，成功获得了嵌入N掺杂碳骨架（CoO / Co3S4 @ N-C）中的超细杂CoO / Co3S4纳米粒子。作为钠离子电池的阳极，CoO / Co3S4 @ NC电极表现出高的比容量（在100 mA g（-1）时为1029.5 mA hg（-1））和出色的倍率能力（在5 A时为428.0 mA hg（-1）） g（-1）），这可能归因于其增强的电导率，便利的Na +传输和固有的结构稳定性。密度泛函理论计算进一步证实，所构建的异质结构可感应电场并促进Na +传输中的快速反应动力学。这项工作为构建高性能金属离子电池的金属氧化物/硫化物异质结构提供了一种可行的方法。

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  • 来源
    《Advanced Functional Materials》 |2019年第29期|1901925.1-1901925.9|共9页
  • 作者

    Guo Can; Zhang Wenchao; Liu Yi; He Jiapeng; Yang Shun; Liu Mingkai; Wang Qinghong; Cuo Zaiping;

  • 作者单位

    Jiangsu Normal Univ, Sch Chem & Mat Sci, Xuzhou 221116, Jiangsu, Peoples R China;

    Univ Wollongong, Inst Superconducting & Elect Mat, Sch Mech Mat Mechatron & Biomed Engn, Fac Engn & Informat Sci, Wollongong, NSW 2500, Australia;

    Beijing Univ Chem Technol, Coll Chem Engn, State Key Lab Organ Inorgan Composites, Beijing 100029, Peoples R China;

    Jiangsu Normal Univ, Sch Chem & Mat Sci, Xuzhou 221116, Jiangsu, Peoples R China;

    Jiangsu Normal Univ, Sch Chem & Mat Sci, Xuzhou 221116, Jiangsu, Peoples R China;

    Jiangsu Normal Univ, Sch Chem & Mat Sci, Xuzhou 221116, Jiangsu, Peoples R China;

    Jiangsu Normal Univ, Sch Chem & Mat Sci, Xuzhou 221116, Jiangsu, Peoples R China;

    Univ Wollongong, Inst Superconducting & Elect Mat, Sch Mech Mat Mechatron & Biomed Engn, Fac Engn & Informat Sci, Wollongong, NSW 2500, Australia;

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  • 正文语种 eng
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  • 关键词

    anode; CoO; Co3S4; heterostructure; reaction kinetics; sodium ion batteries;

    机译：阳极;CoO;Co3S4;异质结构;反应动力学;钠离子电池;

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