镶嵌单层MoS_(2)的生物质基硼氮共掺杂碳纳米片合成与储钠性能

Biomass-derived B/N co-doped carbon nanosheets decorated with single-layered MoS_(2) for sodium storage

基于可再生生物质在二维层状晶体表面的自组装及其与四硫代钼酸铵的化学配位作用,发展了一种镶嵌单层MoS_(2)纳米片的超薄硼氮共掺杂碳纳米片的制备策略。此结构中,二维纳米碳结构利于提供更大的电化学活性表面积、连续的电子传导通路并大幅缩短电子传输路径,同时实现单层MoS_(2)纳米结构的均匀分散;均匀镶嵌其内的单层MoS_(2)纳米结构则显著提升了钠离子存储容量,并加速其在充放电过程中氧化还原反应动力学速率。应用于钠离子负极材料时,此类二维复合结构表现出了优异的储钠比容量、倍率性能和循环稳定性。

This work proposed a new strategy for the fabrication of biomass-derived B/N co-doped carbon nanosheets decorated with single-layered MoS_(2) by the self-assembly of renewable biomass molecules on the surface of 2 D layered crystals and fusion of their coordination with ammonium tetrathiomolybdate. In such nanostructure,the presence of carbon nanosheets is beneficial to enlarging the electrochemically active surface area, offering continuous and short electron-transfer pathway, while enabling uniform dispersion of single-layer MoS_(2) nanostructure within them. The single-layered MoS_(2) nanostructure significantly increases the Na^(+) storage capacity and accelerates the redox reaction kinetics upon the charge-discharge process. When applied to sodium ion anode materials, this two-dimensional composite structure exhibits excellent sodium storage specific capacity, rate performance and cycle stability.