Isomorphism combined with intercalation methods to construct hybrid electrode material for high-energy storage capacitor
High-performance electrode materials are obtained by isomorphism and intercalation, which have multi-types of redox reaction centers and the bridge of charge transfer. Part of the Co ions (clusters) was replaced by Ni ions with little difference in radius, and different types of redox reactions were constructed. At the same time, the introduction of 2-methylbenzimidazole in the intercalation of two-dimensional (2D) Ni/Co-MOF accelerated the charge transfer. Synthetic composite electrode material exhibited high specific capacitances of 2422.7 F·g-1 at a current density of 1.0 A·g-1 in three system and cycle retention of 86 % after 3000 cycles. Asymmetric supercapacitor device assembled with the composite material and activated carbon exhibits a maximum energy density of 82.8 Wh·kg-1 at a power density of 700 W·kg-1, which showed that the composite has good potential application value.