Abstract 3D flower-like MoS2/NiCo(OH)2CO3 (MoS2/NiCoHC) composites are synthesized by a hydrothermal method using MoS2 nanospheres as precursors. The microstructure of the composite is characterized by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. The MoS2 nanospheres are served as nucleating agent to trigger the formation of NiCoHC nanosheets, which self-assemble into 3D flower-like MoS2/NiCoHC particles. The MoS2/NiCoHC composites exhibit a high supercapacitive performance with a specific capacity of 583 C g-1 (1296 F g-1) at 1 A g -1 and a long-term cycling stability by retaining 94.3% after 2000 cycles in 2 M KOH. Moreover, the asymmetric supercapacitor of MoS2/NiCoHC as the positive electrode and commercial active carbon as the negative electrode achieves a high power density of 375 W·kg-1 at 16.4 Wh·kg-1. The enhanced performance of the MoS2/NiCoHC composite can be attributed to the larger surface area provided by 3D flower-like structure and the synergy of the two hybrids.

中文翻译：

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纳米片组装的 3D 花状 MoS2/NiCo(OH)2CO3 复合材料可增强超级电容器的性能

摘要 以 MoS2 纳米球为前驱体，通过水热法合成了 3D 花状 MoS2/NiCo(OH)2CO3 (MoS2/NiCoHC) 复合材料。通过X射线衍射、拉曼光谱、扫描电子显微镜、透射电子显微镜和X射线光电子能谱对复合材料的微观结构进行表征。MoS2 纳米球作为成核剂触发 NiCoHC 纳米片的形成，其自组装成 3D 花状 MoS2/NiCoHC 颗粒。MoS2/NiCoHC 复合材料表现出很高的超级电容性能，在 1 A g -1 时的比容量为 583 C g-1 (1296 F g-1)，并且在 2 M 下循环 2000 次后仍保持 94.3% 的长期循环稳定性呵。而且，以 MoS2/NiCoHC 为正极、商用活性炭为负极的非对称超级电容器在 16.4 Wh·kg-1 下实现了 375 W·kg-1 的高功率密度。MoS2/NiCoHC 复合材料的增强性能可归因于 3D 花状结构提供的更大表面积以及两种杂化物的协同作用。