Preparation of Bi2Se3/WSe2 Heterojunction Flower-like Spheres and Study on Sodium Storage Performance
Sodium-ion batteries(SIBs)are considered as a promising alternative to lithium-ion batteries due to their advantages in cost,resources,and safety.However,low capacity,poor rate capability,and short lifespan limits the practical application of SIBs.To address these issues,Bi2Se3/WSe2 flower-like heterostructures with abundant pore structure have been synthesized by a one-step hydrothermal method.This structure can mitigate the volume effect during charge and discharge process,and the built-in electric field at the heterojunction interface enhances ion diffusion reactions,thereby improving electrochemical performance.The assembled Bi2Se3/WSe2 half-cell exhibits high initial Coulombic efficiency,cycling stability,and rate capability.After 100 cycles,the discharge capacity at 0.1 A g-1 is 402.6 mAh·g-1,and after 500 cycles at 1 A·g-1,it reaches a specific capacity of 298.3 mAh·g-1.At high rates(5 A·g-1),the capacity remains high at 259.1 mAh·g-1.
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