Preparation of two-dimensional assembled Ni–Mn–C ternary composites for high-performance all-solid-state flexible supercapacitors
Preparation of two-dimensional assembled Ni–Mn–C ternary composites for high-performance all-solid-state flexible supercapacitors
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DOI：
10.1039/c8ta06412a
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发表时间：
2018-12
影响因子：
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通讯作者：
Xilian Xu;Wenhui Shi;Liu Wenxian;Shaofeng Ye;Ruilian Yin;Lin Zhang;Lixin Xu;Minghua Chen;
中科院分区：
文献类型：
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作者：
Xilian Xu;Wenhui Shi;Liu Wenxian;Shaofeng Ye;Ruilian Yin;Lin Zhang;Lixin Xu;Minghua Chen;
由二维纳米材料组装而成的分级微纳结构由于其独特的结构和协同效应，是一种很有前途的储能器件电极材料。金属有机骨架（MOFs）是各种分级结构纳米材料的通用模板，在储能应用中具有高性能。然而，实现对MOF衍生纳米材料的结构和组成的精确控制仍然是一个很大的挑战，特别是对于那些具有两个或多个组分的复合材料。在这项工作中，一个简单的策略，用于制备MOF衍生的二维组装Ni-Mn-C三元复合材料，这是由Ni（OH）2和MnO 2纳米片装饰在碳基体（Ni（OH）2-MnO 2/C），开发。由于其高的表面积、良好的导电性和组分之间的协同效应，Ni（OH）2-MnO 2/C复合材料表现出优异的电化学性能，特别是高倍率性能（40 A g− 1时为574.0 F g− 1）和循环稳定性（2 A g−1下10000次循环的电容保持率为1087%）。此外，基于Ni（OH）2-MnO 2/C复合材料的全固态超级电容器具有高功率密度、良好的循环稳定性和出色的灵活性。
Hierarchical micro-/nano-structures assembled by two-dimensional (2D) nanomaterials are promising electrode materials for energy storage devices, owing to their unique structures and synergetic effects. Metal–organic frameworks (MOFs) are versatile templates for various hierarchically structured nanomaterials with high-performance in energy storage applications. However, it is still a great challenge to achieve precise control of the structure and composition of MOF-derived nanomaterials, especially for those composites with two or more components. In this work, a facile strategy for the preparation of MOF-derived 2D assembled Ni–Mn–C ternary composites, which are composed of Ni(OH)2 and MnO2 nanosheets decorated on a carbon matrix (Ni(OH)2–MnO2/C), is developed. Due to its high surface area, good electrical conductivity and the synergistic effect among components, the Ni(OH)2–MnO2/C composite exhibits excellent electrochemical performance, especially high-rate performance (574.0 F g−1 at 40 A g−1) and cycling stability (capacitance retention of ∼87% at 2 A g−1 over 10 000 cycles). In addition, the Ni(OH)2–MnO2/C composite-based all-solid-state supercapacitor delivers high power density, good cycling stability and excellent flexibility.