Dual-Phase engineering of Ni3S2/NiCo-MOF nanocomposites for enhanced ion storage and electron migration.

Hybrid dual-phase engineering was proposed to enhance ion storage and electron migration for Ni 3 S 2 /NiCo-MOF, by which the well-designed materials were equipped with ion shuttling channels and electron transferring pathways, deriving from organic ligand pillaring interplanar space in MOFs and semiconductive Ni 3 S 2 , respectively. [Display omitted] • Dual-phase engineering for enhanced ion storage and electron migration was proposed for intercalation-type electrochemical active materials. • Ion-shuttling channels and electron-transferring networks were constructed by enlarged interplanar space in MOF and semiconductive Ni 3 S 2 nanowires, respectively. • Dual pathways boosted intercalation kinetics obviously due to the leaf-like Ni 3 S 2 /NiCo-MOF composite structure. 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·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·g−1 at 2 A·g−1, retained 62.3 % at 8 A·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. [ABSTRACT FROM AUTHOR]