MOF-derived NiS2/V2O3 spherical heterostructures for high-performance supercapacitors

Abstract

This study presents the fabrication of hierarchical nanoflower-like Ni/V-MOF composites through a one-pot hydrothermal method, which were subsequently converted into well-defined spherical NiS₂/V₂O₃ heterostructures via sulfurization and high-temperature calcination. The NiS₂/V₂O₃ hybrid material exhibits enhanced charge storage characteristics with a gravimetric capacitance of 1295 F g⁻¹ under 1 A g⁻¹. Furthermore, electrochemical assessment indicates sustained cyclic durability with 85.8 % capacity preservation maintained through 3000 cycles under 10 A g⁻¹. To assess practical applicability, an NiS₂/V₂O₃//AC asymmetric supercapacitor was fabricated, exhibiting superior energy storage characteristics with an energy density measuring 35.1 Wh kg⁻¹ and specific power attaining 763.3 W kg⁻¹. Particularly noteworthy is the device's outstanding cyclic stability, retaining 91.4 % capacity after 10,000 cycles. These findings not only confirm the effectiveness of the proposed MOF-derived heterostructure design but also highlight their promising potential for next-generation energy storage applications.