Carbon coated hetero sulfides nanoboxes with efficient pseudocapacitive behavior for sodium storage

Engineering heterojunction with the interfacial synergism is an effective anode design strategy to innovate the surface pseudocapacitive reaction and facilitate the charge transfer dynamics, thus resulting in improved properties for sodium-ion batteries. Herein, the heterogeneous structure of Sb2S3-CoS2 nanoboxes coated with nitrogen-doped carbon shell (Sb2S3-CoS2@NC) is fabricated through the replacement of Co2+ with Sb3+, and the subsequent sulfurization reaction. The advantages of exquisite hollow structure and carbon coating not only effectively buffer the vast volumetric variation to prevent the collapse of electrode but also accelerate the charge transfer to optimize rate property. Moreover, the interfacial synergism between Sb2S3-CoS2 heterojunction improves surface pseudocapacitive Na+ uptake and boosts the Na+ transport. Consequently, the developed Sb2S3-CoS2@NC nanoboxes exhibit advanced anode performances of high specific capacity, stable cyclic durability, and good rate capability. This approach can be utilized to develop other hollow structured heterogeneous materials for high performance energy storage and conversion application.