A synergistic strategy combing amorphous Ni3S4 quantum dots and zeolite imidazole framework nanosheets for enhanced supercapacitor performance

Zero-dimensional amorphous Ni3S4 quantum dots (QDs) are easy to agglomerate due to their huge surface energy and van der Waals force, and have a large number of interfaces that hinder electron transfer. Although the zeolite imidazole framework nanosheets (ZIN-P) have a conductive conjugated system, but the specific capacity is relatively low. Here, we propose a synergistic strategy that combines amorphous Ni3S4 QDs and ZIN-P, so that the electrochemical performance of the composite material is better than that of a single component. It was demonstrated that the electrochemical performance of the composite material can be enhanced twice versus that of amorphous Ni3S4 QDs and 6 times versus that of ZIN-P. Subsequently, Ni3S4 QDs@ZIN-P and activated carbon were assembled into an asymmetric supercapacitor, the energy density can reach 41.5 Wh kg(-1). This work is expected to add new ideas for the rational design of electrode material structure.

Automated summary

By combining amorphous Ni3S4 quantum dots and zeolite imidazole framework nanosheets (ZIN-P), a synergistic effect is achieved in the composite material, resulting in improved electrochemical performance compared to individual components.