Ultrathin Transition Metal Dichalcogenide/3d Metal Hydroxide Hybridized Nanosheets to Enhance Hydrogen Evolution Activity

Advanced Materials
Zhengju ZhuHuijun Zhao

Abstract

The vast majority of the reported hydrogen evolution reaction (HER) electrocatalysts perform poorly under alkaline conditions due to the sluggish water dissociation kinetics. Herein, a hybridization catalyst construction concept is presented to dramatically enhance the alkaline HER activities of catalysts based on 2D transition metal dichalcogenides (TMDs) (MoS2 and WS2 ). A series of ultrathin 2D-hybrids are synthesized via facile controllable growth of 3d metal (Ni, Co, Fe, Mn) hydroxides on the monolayer 2D-TMD nanosheets. The resultant Ni(OH)2 and Co(OH)2 hybridized ultrathin MoS2 and WS2 nanosheet catalysts exhibit significantly enhanced alkaline HER activity and stability compared to their bare counterparts. The 2D-MoS2 /Co(OH)2 hybrid achieves an extremely low overpotential of ≈128 mV at 10 mA cm-2 in 1 m KOH. The combined theoretical and experimental studies confirm that the formation of the heterostructured boundaries by suitable hybridization of the TMD and 3d metal hydroxides is responsible for the improved alkaline HER activities because of the enhanced water dissociation step and lowers the corresponding kinetic energy barrier by the hybridized 3d metal hydroxides.

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Citations

Apr 3, 2019·Chemistry : a European Journal·Rui XiangZidong Wei
Aug 9, 2020·Chemistry : a European Journal·Bo You, Shi Zhang Qiao
Jan 1, 2020·Journal of the American Chemical Society·Lin JuLiangzhi Kou
Jun 14, 2021·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Ze-Hua LiuXiao-Guang Ma
Jul 7, 2020·ACS Applied Materials & Interfaces·Kelong AoWalid A Daoud

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