Hydrothermal intercalation for the synthesis of novel three-dimensional hierarchically superstructured carbons composed of graphene-like ultrathin nanosheets
Hydrothermal intercalation for the synthesis of novel three-dimensional hierarchically superstructured carbons composed of graphene-like ultrathin nanosheets
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DOI：
10.1016/j.carbon.2021.01.024
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发表时间：
2021-02-03
期刊：
影响因子：
10.9
通讯作者：
Zhan, Haiyan
中科院分区：
文献类型：
--
作者：
Li, Zhaopeng;Yu, Peifeng;Zhan, Haiyan
由低维纤维或片材组装的层次化超结构碳(HSCs)因其稳定的交叉碳网络、较大的可达比表面积和优化的离子传递而在能源领域具有巨大的应用前景。然而，具有良好纳米结构的造血干细胞的合成仍然是一个挑战。在此基础上，采用插层生长的方法构建了夹心型交替层状碳/硅酸锌复合材料，并在此基础上发展了一种新型的超高性能复合材料。这种类型的HSC是由厚度小于1 nm的超薄碳纳米片(2-3个碳层)组装而成的，由于相互连接的自支撑纳米片，显示出刚性和稳定的三维网络。深入研究发现，HSC的生长符合独特的章鱼模型，均相和非均相反应条件均适用于该合成体系。更重要的是，所构建的超结构可以涂覆在任何含SiO_2的衬底表面，这为设计各种形貌的超结构碳提供了一种途径。结合了较大的可获得表面积和优化的离子转移和电子迁移纳米结构，所制备的HSC在电子双电层电容器中表现出优异的性能。(C)2021年爱思唯尔有限公司。保留所有权利。
Hierarchical superstructured carbons (HSCs) assembled by low-dimensional fibers or sheets have held a great prospect in energy applications on account of their stable intersecting carbon network, large accessible surface area and optimized ion transfer. However, the synthesis of HSCs with well-defined nanostructure is still a challenge. Herein, a novel HSC is developed on the basis of constructing sandwich-type alternate layered carbon/Zn2SiO4 composite by an intercalation growth strategy. This type of HSC is assembled by graphene-like ultrathin carbon nanosheets with a thickness less than 1 nm (2-3 carbon layers), and displays rigid and stable 3D network owing to the interconnected self-supported nanosheets. The in-depth investigation reveals that the growth of HSC complies with a unique "octopus model", and both the homogeneous and heterogeneous reaction conditions are applicable for the synthesis system. More importantly, the as-constructed superstructure can be coated on the surface of any SiO2-containing substrates, which offers an avenue to design superstructured carbons with various morphologies. With combination of the large accessible surface area and optimized nanostructure for ion transfer and electron immigration, the as-prepared HSC demonstrates superior performance in electronic double-layer capacitor. (C) 2021 Elsevier Ltd. All rights reserved.