Authors:

Yiyin Tao

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About Paper:

Two-dimensional layered materials are known for their flexible bandgap and great structural tunability. They are great candidates for semiconductors, optical materials, and catalysts. Intercalation is a method of tuning the structure of the layered material. Transition metal ions intercalation are driven by charge transfer and their redox activity, enabling the phase engineer on host material. However, Due to the different reduction potentials, charges, and sizes of metal precursors, side reactions such as secondary nucleation, metal oxides, and etched host materials also occur. In previous studies, systematic intercalation conditions have been done on WS2, in which we found the reaction and side products can be controlled by charge density and reduction potential. In this paper, we performed a systematic study on LixMoS2 to study the trends in intercalation and following structural changes. Reaction was driven by charge density and reduction potential; metal precursors with low charge density result in secondary nucleation and metal precursors with high charge densities etch the sheets potentially. After intercalation, we observed that the structure of MoS2 shifts from 2H semiconducting phase to 1T metallic phase which can be used as a catalyst. HER measurements showed that intercalated MoS2 nanosheets are catalytic active. Keywords: Two-Dimensional Material; Initercalation; Metal

Source:

Purdue University / 2024

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Co-authors:

Yiyin Tao