Abstract
MOFs have been widely recognized in battery-supercapacitor hybrid devices. Here, the electrochemical performance of Ni MOF as a battery-type material was primarily improved by morphological engineering based on solvent and Co ions. Varying the solvent type, solvent ratio, and Ni/Co ratio, NiCo(1:0.5)MOF H2O showed the largest specific capacitance of 1225.56 F g−1 (specific capacity of 551.50 C g−1) at 0.5 A g−1, owing to its largest specific surface and good redox activity caused by the difference in the solvent solubility, solvent polarity and coordination ability of metal ions. Furthermore, a solid-state battery-supercapacitor hybrid device was assembled, serving NiCo(1:0.5)MOF H2O and active carbon material obtained from bamboo as the positive and negative electrodes, separately. At a power density of 750.00 W kg−1, this device emerged with a large energy density of 108.96 Wh kg−1. After 5000 cycles, it can maintain 89.09 % of the initial value. Notably, this device could furnish energy for the LED emitting, reflecting a giant application potential.
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