Solvothermal synthesis of ternary metal-organic framework electrode material for high-performance hybrid supercapacitors

Metal–organic framework (MOF) compounds are particularly attractive as promising advanced functional materials in energy storage and conversion. However, they exhibit limited electrochemical properties due to their inherent instability and poor electrical conductivity. Herein, a high-conductive electrode material of trimetallic Co/Ni/Fe-MOF was prepared using a solvothermal method. The morphology, specific surface area, and electrochemical properties of the Co/Ni/Fe-MOF were measured. Experimental results show that Co/Ni/Fe-MOF materials have a mesoporous structure and a large available specific surface area of 17.04 m²·g⁻¹. When the discharge current density is 1 A·g⁻¹, the specific capacitance of Co/Ni/Fe-MOF is as high as 2290 F·g⁻¹. An asymmetric supercapacitor device was assembled using Co/Ni/Fe-MOF material as the positive electrode and activated carbon (AC) as the negative electrode. The Co/Ni/Fe-MOF//AC asymmetric supercapacitor has a power density of 7500 W·kg⁻¹ and an energy density of 132.3 Wh·kg⁻¹ in a potential window of 1.5 V. The excellent electrochemical properties of Co/Ni/Fe-MOF make it a wide application prospect as an electrode material for supercapacitors in the energy storage field.