Dual-Phase engineering of Ni 3 S 2 /NiCo-MOF nanocomposites for enhanced ion storage and electron migration

Constructing fast dual pathways for electron transferring and ions intercalating is an effective solution to develop outstanding electrode materials with high capacity and long cycle stability. Herein, dual -phase engineering was proposed to design a leaf -like hierarchical structure comprising Ni 3 S 2 nanowires and NiCo-MOF nanosheets, in which the semiconductive Ni 3 S 2 nanowires could serve as electron transferring pathways and organic ligands in NiCo-MOF enlarged ions intercalating channels. The Ni 3 S 2 /NiCo-MOF nanocomposites as cathode materials for alkaline batteries performed 255 mAh g -1 at 1 A center dot g - 1 . Notably, a full battery with Ni 3 S 2 /NiCo-MOF cathode and Fe 2 O 3 anode had a reversible capacity of 215 mAh center dot g - 1 at 2 A center dot g - 1 , retained 62.3 % at 8 A center dot g - 1 . After 2000 charge/ discharge cycles, the initial capacity remained 82 %. Moreover, the highest energy density and power density achieved 129 Wh kg - 1 and 5.2 kW kg - 1 , respectively. This dual -phase engineering boosted intercalating kinetics by constructing speedy ion/electron dual pathways, thereby offering an avenue for designing more robust energy storage systems.