Ternary Ni(OH)2/Co(OH)2/Mg(OH)2 derived from MOF-74 as a positive material for the determination of high performance supercapacitor

Based on the precursor of CoNi-MOF-74, ternary Ni(OH)(2)/Co(OH)(2)/Mg(OH)(2) with the rod-like structure was designed and synthesized via the seed method and the solvothermal method. By adjusting the amount of load, it can be found that when the mass ratio of load and template is 1:1, NCM-2 (Ni(OH)(2)/Co(OH)2/Mg(OH)(2)-2) is successfully prepared and exhibits the best electrochemical characteristic. The 666.8 C g(-1) specific capacity at 1 A g(-1) and the 92.68% cyclic stability after 5000 cycles prove the superiority of NCM-2. In addition, when we used NCM-2 as the positive and AC (activated carbon) as the negative to make a supercapacitor, the specific capacity was 214 C g(-1) at 1 A g(-1) and the energy density was 55.3 Wh kg(-1) at a power density of 930.2 Wh kg(-1). At the same time, it is wonderful to see that two charged NCM-2//AC hybrid supercapacitor can manage to turn on four different colours of LEDs, showing an excellent practical application value.

Automated summary

A ternary Ni(OH)(2)/Co(OH)(2)/Mg(OH)(2) with rod-like structure was successfully synthesized via the seed method and the solvothermal method. The NCM-2 (Ni(OH)(2)/Co(OH)2/Mg(OH)(2)-2) with a load to template mass ratio of 1:1 exhibited the best electrochemical characteristics, including a specific capacity of 666.8 C g(-1) at 1 A g(-1) and a cyclic stability of 92.68% after 5000 cycles. Furthermore, when NCM-2 was used as the positive electrode and AC as the negative electrode in a supercapacitor, it showed a specific capacity of 214 C g(-1) at 1 A g(-1) and an energy density of 55.3 Wh kg(-1) at a power density of 930.2 Wh kg(-1). The NCM-2//AC hybrid supercapacitor also demonstrated practical application value by powering four different colors of LEDs.