MOF-derived NiAl 2 O 4 /NiCo 2 O 4 porous materials as supercapacitors with high electrochemical performance.

Metal-organic framework compounds are extensively utilized in various fields, such as electrode materials, owing to their distinctive porous structure and significant specific surface area. In this study, NiCoAl-MOF metal-organic framework precursors were synthesized by a solvothermal method, and NiAl ₂ O ₄ /NiCo ₂ O ₄ electrode materials were prepared by the subsequent calcination of the precursor. These materials were characterized by XRD, XPS, BET tests, and SEM, and the electrochemical properties of the electrode materials were tested by CV and GCD methods. BET tests showed that NiAl ₂ O ₄ /NiCo ₂ O ₄ has an abundant porous structure and a large specific surface area of up to 105 m ² g ^-1 . The specific capacitance of NiAl ₂ O ₄ /NiCo ₂ O ₄ measured by the GCD method reaches up to 2870.83 F g ^-1 at a current density of 1 A g ^-1 . The asymmetric supercapacitor NiAl ₂ O ₄ /NiCo ₂ O ₄ //AC assembled with activated carbon electrodes has a maximum energy density of 166.98 W h kg ^-1 and a power density of 750.00 W kg ^-1 within a voltage window of 1.5 V. In addition, NiAl ₂ O ₄ /NiCo ₂ O ₄ materials have good cycling stability. These advantages make it a good candidate for the application of high-performance supercapacitors.