Nanosheet-assembled 3D flower-like MoS2/NiCo(OH)2CO3 composite for enhanced supercapacitor performance

3D flower-like MoS 2 /NiCo(OH) 2 CO 3 (MoS 2 /NiCoHC) composites are synthesized by a hydrothermal method using MoS 2 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 MoS 2 nanospheres are served as nucleating agent to trigger the formation of NiCoHC nanosheets , which self-assemble into 3D flower-like MoS 2 /NiCoHC particles. The MoS 2 /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 MoS 2 /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 MoS 2 /NiCoHC composite can be attributed to the larger surface area provided by 3D flower-like structure and the synergy of the two hybrids.