MOF-derived spherical trimetallic NiZnCo-LDH for hybrid supercapacitors

By designing the composition of transition elements and combining the adjustable structure of MOFs, it is reported that the synthesis of bimetallic ZnCo-MOFs based on different Zn/Co molar ratios, then the NiZn 1 Co 2 -LDH nanospheres are synthesized by Ni 2+ hydrolysis. Compared with the bimetallic NiZn-LDH and NiCo-LDH, the trimetallic layered hydroxide NiZn 1 Co 2 -LDH after adding Zn 2+ reached a high specific capacity of 217.3 mAh g −1 at 1 A g −1 . Additionally, both have excellent cycle stability (84.6% capacity retention after 5000 charge–discharge cycles at 10 A g −1 ) and strong rate performance (72.47% capacity retention rate at 10 A g −1 ) as well. Furthermore, a hybrid supercapacitor (HSC) with NiZn 1 Co 2 -LDH as positive electrodes and activated carbon as negative electrodes was fabricated. The HSC device delivered a high energy density of 45 Wh kg −1 at a power density of 774.1 W kg −1 and excellent cycling stability (specific capacity retention of 92% after 10,000 cycles).