Intercalated 2D MoS2 Utilizing a Simulated Sun Assisted Process: Reducing the HER Overpotential

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• 作者：Yichao Wang ; Benjamin J. Carey ; Wei Zhang ; Adam F. Chrimes ; Liangxian Chen ; Kourosh Kalantar-zadeh ; Jian Zhen Ou ; Torben Daeneke
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：February 4, 2016
• 年：2016
• 卷：120
• 期：4
• 页码：2447-2455
• 全文大小：522K
• ISSN：1932-7455

文摘

Molybdenum disulfide (MoS₂) in its two-dimensional (2D) morphology has favorable catalytic properties for the hydrogen evolution reaction (HER). To fully take advantage of this capability and in order to enhance this material’s HER performance, viable methods for synthesizing and tuning electronic properties of 2D MoS₂ should be developed. Here, we demonstrate a facile and nonhazardous approach to partially intercalate Li⁺ ions into the 2D MoS₂ host structure. We show that such an intercalation is possible in a nonhazardous saline Li⁺ containing solution using a grinding/sonication-assisted exfoliation method in both dark and simulated sun irradiation conditions. A partial phase transformation from semiconducting (2H) to metallic (1T) phase is observed for the majority of flakes, after the process. We observe a notable enhancement of the HER activity for samples prepared under light illumination in the presence of a Li⁺ containing solution, in comparison to both pristine 2D MoS₂ samples and samples processed in the dark. This method provides an effective approach for phase engineering of 2D MoS₂ for enhancing its HER performance.