"High Electrochemical Selectivity of Edge versus Terrace Sites in Two-Dimensional Layered MoS2 Materials"

Haotian Wang: Qianfan Zhang, Hongbin Yao, Zheng Liang, Hyun-Wook Lee, Po-Chun Hsu, Guangyuan Zheng, and Yi Cui; ACS Nanoletters, 11/05/14.

Additional Authors: Qianfan Zhang, Hongbin Yao, Zheng Liang, Hyun-Wook Lee, Po-Chun Hsu, Guangyuan Zheng, and Yi Cui

Abstract:

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Exploring the chemical reactivity of different atomic sites on crystal surface and controlling their exposures are important for catalysis and renewable energy storage. Here, we use two-dimensional layered molybdenum disulfide (MoS2) to demonstrate the electrochemical selectivity of edge versus terrace sites for Li–S batteries and hydrogen evolution reaction (HER). Lithium sulfide (Li2S) nanoparticles decorates along the edges of the MoS2 nanosheet versus terrace, confirming the strong binding energies between Li2S and the edge sites and guiding the improved electrode design for Li–S batteries. We also provided clear comparison of HER activity between edge and terrace sites of MoS2 beyond the previous theoretical prediction and experimental proof.