MOF-derived NiAl2O4/NiCo2O4 porous materials as supercapacitors with high electrochemical performance

Abstract

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 NiAl₂O₄/NiCo₂O₄ 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 NiAl₂O₄/NiCo₂O₄ has an abundant porous structure and a large specific surface area of up to 105 m² g⁻¹. The specific capacitance of NiAl₂O₄/NiCo₂O₄ 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 NiAl₂O₄/NiCo₂O₄//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, NiAl₂O₄/NiCo₂O₄ materials have good cycling stability. These advantages make it a good candidate for the application of high-performance supercapacitors.