A controllable strategy for the self-assembly of WM nanocrystals/nitrogen-doped porous carbon superstructures (M = O, C, P, S, and Se) for sodium and potassium storage†,Journal of Materials Chemistry A

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A controllable strategy for the self-assembly of WM nanocrystals/nitrogen-doped porous carbon superstructures (M = O, C, P, S, and Se) for sodium and potassium storage†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-12-10 , DOI: 10.1039/c9ta11312f
Xiaojuan Jiao _{1,

2,

3,

4,

5} , Xiaojie Liu _{1,

2,

3,

4,

5} , Beibei Wang _{4,

5,

6,

7,

8} , Gang Wang _{4,

5,

6,

7,

8} , Xiujuan Wang _{1,

2,

3,

4,

5} , Hui Wang _{1,

2,

3,

4,

5}

Affiliation

Complex superstructures assembled from simple building blocks have attracted a wide range of interest in engineering materials due to their synergistic and enhanced properties. Herein, a controllable and effective strategy to assemble hierarchical superstructures using a W-polydopamine (W-PDA) complex as the binder and SiO₂@C solid spheres as the blocks is demonstrated. The micro-sized complex 3D W-PDA superstructure assembled from SiO₂@C solid spheres is first formed in a water/ethanol system through the side-by-side assembly mechanism. After carbonization, phosphorization, sulfuration and selenization heat treatment and etching processes, a series of 3D complex superstructures with WM (M = O, C, P, S, and Se) nanocrystals and N-doped porous carbon (N–PC) with superporous structures derived from SiO₂ blocks are generated. The well-organized WM nanocrystals can provide more active sites for Na⁺/K⁺ insertion and extraction, while the N-doped carbon matrix with superporous structures can enhance electrical conductivity and stabilize the structural integrity of the overall electrode. As a proof of concept, the WSe₂/N–PC superstructure with a large interlayer space displays preeminent rate performance and remarkable cycling stability for both SIBs (390 mA h g⁻¹ at 0.1 A g⁻¹ over 200 cycles) and PIBs (220 mA h g⁻¹ at 0.1 A g⁻¹ over 200 cycles). This approach will open an avenue to new multifunctional complex superstructures for more energy storage and conversion applications.

中文翻译：

WM纳米晶体/氮掺杂多孔碳超结构（M = O，C，P，S和Se）自组装用于钠和钾存储的可控制策略†

由简单的构件组装而成的复杂的上层建筑因其协同作用和增强的性能而引起了工程材料的广泛兴趣。在本文中，展示了一种可控且有效的策略，该方法使用W-聚多巴胺（W-PDA）配合物作为粘合剂和SiO ₂ @C固体球体作为嵌段来组装分层超结构。由SiO ₂组装而成的微细复杂的3D W-PDA上部结构首先通过并排组装机制在水/乙醇系统中形成@C固体球。经过碳化，磷化，硫化和硒化热处理和蚀刻工艺后，一系列具有WM（M = O，C，P，S和Se）纳米晶体和N掺杂多孔碳（N–PC）的一系列3D复杂超结构产生了源自SiO ₂嵌段的结构。井井有条的WM纳米晶体可以为Na ⁺ / K ^+的插入和提取提供更多的活性位，而具有超孔结构的N掺杂碳基质可以增强电导率并稳定整个电极的结构完整性。作为概念验证，WSe ₂/ N-PC上层建筑具有大的层间空间显示卓越的倍率性能和显着的循环稳定性两者的SIB（390毫安汞柱^-1在0.1 A克^-1超过200个循环）的PIB和（220毫安汞柱^-1在0.1 A克^{- 1个}超过200个周期）。这种方法将为新的多功能复杂的上层建筑开辟一条道路，以用于更多的能量存储和转换应用。

更新日期：2020-01-08

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