NiS2/FeS Heterostructured Nanoflowers for High-Performance Sodium Storage

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Abstract

Transition metal sulfides demonstrate attractive potential for sodium storage owing to their high theoretical specific capacity and high reserve. However, the low conductivity and volume expansion deteriorate their high-rate performance and cycling stability. In this work, we construct NiS2/FeS heterostructure by growing Ni-based layered double hydroxide nanosheets on Fe-based Prussian Blue nanocrystals followed by gaseous sulfurization, giving rise to flower-like NiS2/FeS nanoparticles. The as-prepared nanocomposite exhibits good rate performance of 156 mAh g−1 at 50 A g−1 and long cycle life of 606 mAh g−1 at 5 A g−1 after 1,000 cycles, which are superior to the heterostructure-free counterpart of NiS2 and FeS. Density functional theory calculation further verifies that the enhanced electrochemical performance of NiS2/ FeS is due to the existence of interface derived from the heterostructure.

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Yan, D., Xiao, S., Li, X., Jiang, J., He, Q., Li, H., … Chen, J. S. (2023). NiS2/FeS Heterostructured Nanoflowers for High-Performance Sodium Storage. Energy Material Advances, 4. https://doi.org/10.34133/energymatadv.0012

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