Two-dimensional Ni-Mn MOF grown on carbon cloth for flexible supercapacitors

A 2D nickel-manganese layered double hydroxide was generated on the surface of carbon cloth (CC) by hydrothermal method, and it was converted into a two-dimensional Ni-Mn metal-organic framework Ni-Mn (MOF) by solvothermal method, and its morphology could be maintained well. The effects of molar ratio of Ni and Mn, reaction temperature, and reaction time on the morphology, structure, and properties of the material were investigated. The optimal electrochemical performance of the Ni-Mn MOF/CC electrode was achieved when the molar ratio of Ni and Mn elements was 9:1, the reaction temperature was 120 degrees C, and the reaction time was 12 hours, respectively. The area specific capacitance of the electrode can be reached as high as 4 007.5 mF center dot cm(-2) at a current density of 1 mA center dot cm(-2), and it showed good cycling stability. The electrode can be applied to a flexible symmetric supercapacitor, which can be bent 180 degrees. The capacitance retention rate was 83.6% after 5 000 cycles at a current density of 10 mA center dot cm(-2), demonstrating good cycling stability and flexibility.