通过电化学脱锂发现1T相MoS2会延迟转变为2H相。
Delayed 1T to 2H Phase Transition Upon Electrochemical Delithiation of LiMoS2
- 用微电极阵列对单层MoS2进行电化学脱锂实验。
- 脱锂后1T相在数天内缓慢转变回热力学稳定的2H相。
- 揭示了脱锂过程的相变路径，可电化学合成亚稳态1T相。
二硫化钼（MoS2）是一种广泛研究的层状材料，适用于电子、光学和催化领域。其范德华层间可嵌入锂离子，触发半导体2H相与金属1T相之间的相变。虽然锂插入会引发向1T相的转变，但电化学脱锂时的相变行为尚不明确。本研究利用微电极阵列对单层MoS2进行电化学（脱）锂循环。结合电化学电压分析与相关拉曼光谱，发现经电化学循环并脱锂后的MoS2薄片初始仍保持1T相，但经过数日后逐渐转变为热力学稳定的2H相。该结果阐明了脱锂过程中的相变路径，并展示了电化学合成亚稳态1T-MoS2的能力。
原文摘要 · Abstract (English)
Molybdenum disulfide (MoS2) is a widely studied layered material for electronic, optical, and catalytic applications. It can host lithium ions between the van der Waals layers, which triggers a phase transition between the semiconducting 2H phase and metallic 1T phase. While lithium insertion triggers a phase transition to the 1T phase, the phase behavior upon electrochemical lithium removal is not resolved. In this work, we conduct single-flake electrochemical (de)lithiation of MoS2 using microelectrode arrays. Through both electrochemical voltage analysis and correlative Raman spectroscopy, we show that an electrochemically cycled and delithiated MoS2 flake initially remains in the 1T phase. However, over the course of several days, it transitions back into the thermodynamically stable 2H phase. This result resolves the phase transformation pathway upon delithiation and showcases the ability to electrochemically synthesize the metastable 1T-MoS2 phase.
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