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首页> 外文期刊>Advanced Functional Materials >Functionalized Zn@ZnO Hexagonal Pyramid Array for Dendrite-Free and Ultrastable Zinc Metal Anodes
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Functionalized Zn@ZnO Hexagonal Pyramid Array for Dendrite-Free and Ultrastable Zinc Metal Anodes

机译：用于树突式无熔融锌金属阳极的官能化Zn @ Zno六角金字塔阵列

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摘要

Here, an electrode comprising a Zn hexagonal pyramid array (HPA) coated with a functionalized ZnO layer (Zn@ZnO HPA) is prepared using a periodic anodizing technique. The HPA structure markedly increases the electroactive surface area of Zn anode, thus decreasing the local current density. Furthermore, the functionalized ZnO coating layer has a gradient thickness that plays an important role in the selective deposition of Zn ions and the mitigation of side reactions at the interface. The electrochemical stability of the Zn@ZnO HPA electrode, which is closely related to the electroactive surface area and charge transfer resistance, is determined by the "split" value, i.e., ratio of current-off to current-on time, a parameter of the periodic anodizing process. Compared with the pristine Zn-based symmetric cell, the Zn@ZnO HPA-based symmetric cell is safely operated in the investigated experimental range with the 10-fold improved running life and 25-fold enhanced current density without Zn dendrite growth. Moreover, the Zn@ZnO HPA/MnO(2)battery exhibits outstanding long-term cyclability (nearly 100%) with greater than 99% Coulombic efficiency after 1000 cycles at a current density of 9 A g(-1). This periodic anodizing technique for ultrastable Zn metal anodes is expected to contribute to the development of inherently safe energy storage systems.
机译：这里，使用周期性阳极氧化技术制备包含涂有官能化ZnO层（Zn ZnO HPA）的Zn六方嘧酰胺阵列（HPA）的电极。 HPA结构显着增加Zn阳极的电活性表面积，从而降低局部电流密度。此外，官能化ZnO涂层具有梯度厚度，其在Zn离子的选择性沉积中起重要作用和界面处的副反应的减轻。 Zn @ ZnO HPA电极的电化学稳定性与电活性表面积和电荷传递电阻密切相关，由“分开”值，即电流截止到电流接通时间的比率确定定期阳极氧化过程。与基于原始的Zn的对称电池相比，基于Zn ZnO HPA的对称电池在调查的实验范围内安全操作，其中10倍改善了运行寿命和25倍的增强电流密度而没有Zn树枝状生长。此外，Zn @ ZnO HPA / MnO（2）电池在1000次循环的电流密度为9Ag（-1）后，Zn @ ZnO HPA / MNO（2）电池在1000次循环后表现出优异的长期可循环性（近100％）。预期该用于超型Zn金属阳极阳极的周期性阳极氧化技术有助于开发固有的安全能量存储系统。

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  • 来源
    《Advanced Functional Materials》 |2020年第36期|2004210.1-2004210.11|共11页
  • 作者

    Kim Ji Young; Liu Guicheng; Shim Ga Young; Kim Hansung; Lee Joong Kee;

  • 作者单位

    Korea Inst Sci & Technol Ctr Energy Storage Res Hwarang Ro 14 Gil 5 Seoul 02792 South Korea|Yonsei Univ Dept Chem & Biomol Engn 50 Yonsei Ro Seoul 03722 South Korea;

    Korea Inst Sci & Technol Ctr Energy Storage Res Hwarang Ro 14 Gil 5 Seoul 02792 South Korea;

    Korea Inst Sci & Technol Ctr Energy Storage Res Hwarang Ro 14 Gil 5 Seoul 02792 South Korea;

    Yonsei Univ Dept Chem & Biomol Engn 50 Yonsei Ro Seoul 03722 South Korea;

    Korea Inst Sci & Technol Ctr Energy Storage Res Hwarang Ro 14 Gil 5 Seoul 02792 South Korea|Korea Univ Sci & Technol KIST Sch Dept Energy & Environm Engn Hwarang Ro 14 Gil 5 Seoul 02792 South Korea;

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  • 正文语种 eng
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  • 关键词

    periodic anodizing technique; ultrastable zinc metal anode; zinc ion aqueous battery; Zn@ZnO hexagonal pyramid array;

    机译：定期阳极氧化技术;无锌金属阳极;锌离子水电池;Zn @ Zno六角金字塔阵列;

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