Efficient Ultrasonic Synthesis of Ni-Based Metal–Organic Framework for High Performance Battery-Type Supercapacitor Electrodes

The nickel-based metallic organic framework (Ni-MOF) [Ni 2 (OH) 2 (C 8 H 4 O 4 )] material with a hierarchical microblocks structure is efficiently synthesized in 2 h by the ultrasonic method. At the moment Ni-MOF is used as the electrode materials and the supercapacitors (SCs) perform very well with great electrochemical capacity which exhibited particular electric capacitance of 631 C g −1 at a current density of 1 A g −1 . This is one of the highest performances and the shortest synthesis time reported so far for MOFs. Besides, there is a battery – SC hybrid SC assembled by using Ni-MOF and activated carbon. On the condition of having a power density of 302.2 W kg −1 with the voltage window of 1.2 V, the SC produces an energy density of 28.5 W h kg −1 . During the same period, the SC maintains outstanding cycling stability capacitance retention of 85.5% after 3000 cycles at current density of 10 A g −1 . The great electrochemical capability is due to the distinct crystal texture and particular morphological feature. Herein, it is displayed that the ultrasonic method is a fast and effective approach for preparing Ni-MOF SC electrode materials.