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Exploring Advanced Sandwiched Arrays by Vertical Graphene and N-Doped Carbon for Enhanced Sodium Storage

机译：探索使用垂直石墨烯和N掺杂碳的高级夹心阵列，以增强钠的存储

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摘要

Smart hybridization of active materials into tailored electrode structure is highly important for developing advanced electrochemical energy storage devices. With the help of sandwiched design, herein a powerful strategy is developed to fabricate three-layer sandwiched composite core/shell arrays via combined hydrothermal and polymerization approaches. In such a unique architecture, wrinkled MoSe2 nanosheets are sandwiched by vertical graphene (VG) core and N-doped carbon (N-C) shell forming sandwiched core/shell arrays. Interesting advantages including high electrical conductivity, strong mechanical stability, and large porosity are combined in the self-supported VG/MoSe2/N-C sandwiched arrays. As a preliminary test, the sodium ion storage properties of VG/MoSe2/N-C sandwiched arrays are characterized and demonstrated with high capacity (540 mA h g(-1)), enhanced high rate capability, and long-term cycling stability (298 mA h g(-1) at 2.0 A g(-1) after 1000 cycles). The sandwiched core/shell structure plays positive roles in the enhancement of electrochemical performances due to dual conductive carbon networks, good volume accommodation, and highly porous structure with fast ion diffusion. The directional electrode design protocol provides a general method for synthesis of high-performance ternary core/shell electrodes.
机译：将活性材料智能地混合成定制的电极结构对于开发先进的电化学能量存储设备非常重要。借助夹心设计，本文开发了一种强大的策略，可通过组合的水热和聚合方法来制造三层夹心复合核/壳阵列。在这种独特的架构中，起皱的MoSe2纳米片被垂直的石墨烯（VG）核和N掺杂碳（N-C）壳夹在中间，形成夹心的核/壳阵列。自支撑的VG / MoSe2 / N-C夹层阵列结合了有趣的优势，包括高电导率，强机械稳定性和大孔隙率。作为初步测试，VG / MoSe2 / NC夹心阵列的钠离子存储特性被表征并证明具有高容量（540 mA hg（-1）），增强的高倍率能力和长期循环稳定性（298 mA hg） （-1）在1000次循环后在2.0 A g（-1）下）。夹层的核/壳结构由于双重导电碳网络，良好的体积适应性和具有快速离子扩散的高度多孔性结构，在增强电化学性能方面发挥了积极作用。定向电极设计协议为合成高性能三元核/壳电极提供了一种通用方法。

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  • 来源
    《Advanced energy materials》 |2017年第3期|1601804.1-1601804.9|共9页
  • 作者

    Xie Dong; Xia Xinhui; Zhong Yu; Wang Yadong; Wang Donghuang; Wang Xiuli; Tu Jiangping;

  • 作者单位

    Zhejiang Univ, State Key Lab Silicon Mat, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, Hangzhou 310027, Peoples R China|Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Peoples R China;

    Zhejiang Univ, State Key Lab Silicon Mat, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, Hangzhou 310027, Peoples R China|Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Peoples R China;

    Zhejiang Univ, State Key Lab Silicon Mat, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, Hangzhou 310027, Peoples R China|Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Peoples R China;

    Nanyang Polytech, Sch Engn, Singapore 569830, Singapore;

    Zhejiang Univ, State Key Lab Silicon Mat, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, Hangzhou 310027, Peoples R China|Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Peoples R China;

    Zhejiang Univ, State Key Lab Silicon Mat, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, Hangzhou 310027, Peoples R China|Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Peoples R China;

    Zhejiang Univ, State Key Lab Silicon Mat, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, Hangzhou 310027, Peoples R China|Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    molybdenum selenide; N-doped carbon; sandwiched core; shell; sodium storage; vertical graphene arrays;

    机译：硒化钼;N掺杂碳;夹心核;壳;钠存储;垂直石墨烯阵列;

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