Construction of hexagonal nickel-cobalt oxide nanosheets on metal-organic frameworks based on MXene interlayer ion effect for hybrid supercapacitors

Designing and adjusting materials with reasonable microscopic morphology is the key to improving electrochemical performance and assembling hybrid supercapacitors with excellent performance. In this work, firstly, a hydrothermal method is used to grow the NiCo-MOF (NCM) on nickel foam, then NCM is used as the precursor, and the solution containing MXene and Ni2+ and Co2+ are used as the electrolyte to prepare the MXene-Ni-Co@NiCo-MOF/NF (M-NC@NCM/NF) nanosheets through electrodeposition. Since the metal cations will be redistributed between the MXene layers, the nanosheets obtained by electrodeposition in the electrolyte added with MXene exhibit a unique hexagonal nanosheet morphology. This unique form can enhance the electrochemical performance, the capacity retention rate can be maintained at 75.3% after 5000 cycles, and the specific capacity can reach 855.0 C g(-1) (2137.5 F g(-1)) at 1 A g(-1). (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Designing and adjusting materials with reasonable microscopic morphology is crucial for improving electrochemical performance and assembling hybrid supercapacitors. In this study, nanosheets with a unique hexagonal morphology were prepared, showing excellent capacity retention rate and specific capacity.