Metal-organic frameworks based on Schiff base condensation reaction as battery-type electrodes for supercapattery

Abstract

Metal-organic frameworks (MOFs) have widely aroused increasing attention in the field of energy storage and conversion in virtue of their own unique merits such as large specific surface area and tunable porosity. Here, a series of MOFs based on Schiff base condensation reaction (named M-MOF, M = Al3+, Cr3+, Zn2+, Co2+, Ni2+) was prepared by a simple one-step method and employed as the positive electrode material of hybrid supercapattery. The coordination effect of metal ions weakens the π-π stacking of the original framework, which is conducive to the diffusion process of electrolyte ions and the reversible redox reaction resulting in the capacity of M-MOF is greatly improved. Cr-MOF exhibits an excellent specific capacity of 196.3 C g−1 at a current density of 0.5 A g−1 and outstanding cycling stability, achieving 83.8% retention over 10,000 cycles at 10 A g−1 in the three-electrode system. Besides, the as-assembled Cr-MOF//AC (active carbon) hybrid supercapattery cell delivers maximum energy density of 51.9 Wh kg−1 at the power density of 370.1 W kg−1. This study would inspire other M-MOF based on Schiff base condensation reaction for high-performance electrochemical energy storage devices, catering to the demands of practical applications.