材料科学
阳极
电化学
碳纤维
化学工程
碳纳米管
纳米技术
纳米结构
储能
涂层
电极
溶解
兴奋剂
复合材料
光电子学
复合数
物理
工程类
物理化学
功率(物理)
化学
量子力学
作者
Yadong Liu,Cheng Tang,Weiwei Sun,Guanjia Zhu,Aijun Du,Haijiao Zhang
标识
DOI:10.1016/j.jmst.2021.06.036
摘要
Layered structure MoS2 nanosheets have shown great potential for energy storage applications. However, the methodology for elaborately controllable growth of MoS2 onto carbonaceous matrix for promoting the electrochemical performance is highly desirable. Herein, a high-effective, all-in-one in-situ conversion growth strategy has been proposed to construct a stable sandwich-type nanostructure. The formation of the optimized C-MoS2/NCNTs product undergoes a dissolution-recrystallization process, in which ultrathin carbon layer-coated MoS2 nanosheets densely assembled onto the surface of polyimide (PI) derived N-doped carbon nanotubes (CNTs). Theoretical simulation reveals that MoS2 nanosheets possessing an expanded interlayer spacing of 0.92 nm can greatly reduce the barrier energy of Na ions mitigation. Accordingly, the as-made C-MoS2/NCNTs anode delivers superior cycling stability (82% capacity retention after 400 cycles at 1 A g−1) and rate performance (348 mAh g−1 at 2 A g−1). The results demonstrate that the expanded MoS2 interlayer distance, ultrathin outer carbon coating, and N-doped CNTs matrix together accounts for the outstanding sodium storage capability for the C-MoS2/NCNTs electrode.
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