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Title: Preparation of high-percentage 1T-phase transition metal dichalcogenide nanodots for electrochemical hydrogen evolution
Authors: Tan, Chaoliang
Luo, Zhimin
Chaturvedi, Apoorva
Cai, Yongqing
Du, Yonghua
Gong, Yue
Huang, Ying
Lai, Zhuangchai
Zhang, Xiao
Zheng, Lirong
Qi, Xiaoying
Goh, Min Hao
Wang, Jie
Han, Shikui
Wu, Xue-Jun
Gu, Lin
Kloc, Christian
Zhang, Hua
Keywords: Engineering::Materials
Issue Date: 2018
Source: Tan, C., Luo, Z., Chaturvedi, A., Cai, Y., Du, Y., Gong, Y., . . . Zhang, H. (2018). Preparation of high-percentage 1T-phase transition metal dichalcogenide nanodots for electrochemical hydrogen evolution. Advanced materials, 30(9), 1705509-. doi:10.1002/adma.201705509
Journal: Advanced materials
Abstract: Nanostructured transition metal dichalcogenides (TMDs) are proven to be efficient and robust earth-abundant electrocatalysts to potentially replace precious platinum-based catalysts for the hydrogen evolution reaction (HER). However, the catalytic efficiency of reported TMD catalysts is still limited by their low-density active sites, low conductivity, and/or uncleaned surface. Herein, a general and facile method is reported for high-yield, large-scale production of water-dispersed, ultrasmall-sized, high-percentage 1T-phase, single-layer TMD nanodots with high-density active edge sites and clean surface, including MoS2 , WS2 , MoSe2 , Mo0.5 W0.5 S2 , and MoSSe, which exhibit much enhanced electrochemical HER performances as compared to their corresponding nanosheets. Impressively, the obtained MoSSe nanodots achieve a low overpotential of -140 mV at current density of 10 mA cm-2 , a Tafel slope of 40 mV dec-1 , and excellent long-term durability. The experimental and theoretical results suggest that the excellent catalytic activity of MoSSe nanodots is attributed to the high-density active edge sites, high-percentage metallic 1T phase, alloying effect and basal-plane Se-vacancy. This work provides a universal and effective way toward the synthesis of TMD nanostructures with abundant active sites for electrocatalysis, which can also be used for other applications such as batteries, sensors, and bioimaging.
ISSN: 0935-9648
DOI: 10.1002/adma.201705509
Rights: © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved. This paper was published in Advanced materials and is made available with permission of WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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