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

Abstract

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.