Freestanding nanosheets of 1T-2H hybrid MoS2 as electrodes for efficient sodium storage

• 作者: Haiyang Yu Zhenzhu Wang Jiangfeng Ni Liang Li
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2021,（8）
• 页码范围: 237-242
• 页数: 6页
• 语种: 英文

摘要

Molybdenum disulfide (MoS2) is a promising electrode material for sodium-ion batteries as it offers a large capacity through a distinct conversion reaction.However,the electrochemical potential of MoS2 is often restrained by the poor conductivity as the dominant 2H phase is a semiconductor while the metallic 1T phase is thermodynamically unstable.In this work,we report a hybrid design and material preparation of freestanding nanosheets of MoS2 composed of both 1T and 2H phases based on mild hydrothermal reaction.The introduction of the metallic 1T-MoS2 phase into 2H-MoS2 and their intimate hybridization enable a significant improvement in electronic conductivity,while the freestanding architecture avoids possible electrochemical aggregation.When used as electrodes for sodium storage,such a hybrid MoS2 affords a high capacity of ～500 mA h g-1 at 0.5 A g-1 after 300 cycles,and retains capacity of ～200 mA h g-1 at a high current rate of 4 A g-1,thus demonstrating their potential in high-performance battery applications.