材料科学
阳极
硒化物
假电容
电化学
储能
电负性
纳米技术
化学工程
纳米棒
空位缺陷
电化学动力学
阴极
电极
物理化学
超级电容器
冶金
化学
物理
工程类
功率(物理)
量子力学
核磁共振
硒
作者
Kunyan Qian,Li Li,Daquan Yang,Beibei Wang,Hui Wang,Guanghui Yuan,Jintao Bai,Shenghua Ma,Gang Wang
标识
DOI:10.1002/adfm.202213009
摘要
Abstract Sodium‐based dual‐ion batteries (SDIBs) have attracted increasing research interests in energy storage systems because of their advantages of high operating voltage and low cost. However, exploring desirable anode materials with high capacity and stable structures remains a great challenge. Here, an elaborate design is reported, starting from well‐organized MoSe 2 nanorods and introducing metal‐organic frameworks, which simultaneously forms a bimetallic selenide/carbon composite with coaxial structure via electronegativity induction. By rationally adjusting the vacancy concentration and combining heterostructure engineering, the optimized MoSe 2‐x /ZnSe@C as anode material for Na‐ion batteries achieves rapid electrochemical kinetics and satisfactory reversible capacities. The systematic electrochemical kinetic analyses combined with theoretical calculations further unveil the synergistic effect of Se‐vacancies and heterostructure for the enhanced sodium storage, which not only induces more reversible Na + storage sites but also improves the pseudocapacitance and reduce charge transfer resistance, thereby providing a great contribution to accelerating reaction kinetics. Furthermore, the as‐constructed SDIB full cell based on the MoSe 2‐x /ZnSe@C anode and the expanded graphite cathode demonstrates impressively excellent rate performance (131 mAh g −1 at 4.0 A g −1 ) and ultralong cycling life over 1000 cycles (100 mAh g −1 at 1.0 A g −1 ), demonstrating its practical applicability in a wide range of sodium‐based energy storage devices.
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