镶嵌单层MoS2的生物质基硼氮共掺杂碳纳米片合成与储钠性能

doi:10.11949/0438-1157.20210786

摘要/Abstract

摘要：

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MoS₂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MoS₂纳米结构的均匀分散；均匀镶嵌其内的单层MoS₂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。

关键词: 复合材料, 纳米结构, 单层MoS₂, 生物质, 钠离子电池

Abstract:

This work proposed a new strategy for the fabrication of biomass-derived B/N co-doped carbon nanosheets decorated with single-layered MoS₂ by the self-assembly of renewable biomass molecules on the surface of 2D 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 MoS₂ nanostructure within them. The single-layered MoS₂ 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.

Key words: composites, nanostructure, single-layered MoS₂, biomass, Na-ion battery

中图分类号:

TM 911.1

张毅舟, 吴籼虹, 王治宇, 邱介山. 镶嵌单层MoS₂的生物质基硼氮共掺杂碳纳米片合成与储钠性能[J]. 化工学报, 2021, 72(12): 6371-6379.

Yizhou ZHANG, Xianhong WU, Zhiyu WANG, Jieshan QIU. Biomass-derived B/N co-doped carbon nanosheets decorated with single-layered MoS₂ for sodium storage[J]. CIESC Journal, 2021, 72(12): 6371-6379.

图/表 6

图1 SL-MoS2/BNC的形貌结构

Fig.1 Structure and morphology of SL-MoS2/BNC

图2 SL-MoS2/BNC用沸水洗涤前后以及块状MoS2的XRD谱图

Fig.2 XRD patterns of SL-MoS2/BNC before and after refluxing in boiling water and bulk MoS2

图3 SL-MoS2/BNC的XPS谱图

Fig.3 XPS spectra of SL-MoS2/BNC

图4 SL-MoS2/BNC的拉曼谱图（a）、N2吸附-脱附等温线（b）、孔径分布（c）和热重曲线（d）

Fig.4 Raman spectrum（a）, N2 adsorption-desorption isotherm（b）, pores size distribution（c） and TGA curve （d）of SL-MoS2/BNC

图5 SL-MoS2/BNC的储钠电化学性能

Fig.5 Electrochemical performance of SL-MoS2/BNC for Na+ storage

图6 SL-MoS2/BNC的赝电容行为

Fig.6 Pseudocapacitive behavior of SL-MoS2/BNC

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镶嵌单层MoS₂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 MoS₂ for sodium storage

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