TY - JOUR
T1 - Preparation of High-Percentage 1T-Phase Transition Metal Dichalcogenide Nanodots for Electrochemical Hydrogen Evolution
AU - Tan, Chaoliang
AU - Luo, Zhimin
AU - Chaturvedi, Apoorva
AU - Cai, Yongqing
AU - Du, Yonghua
AU - Gong, Yue
AU - Huang, Ying
AU - Lai, Zhuangchai
AU - Zhang, Xiao
AU - Zheng, Lirong
AU - Qi, Xiaoying
AU - Goh, Min Hao
AU - Wang, Jie
AU - Han, Shikui
AU - Wu, Xue-Jun
AU - Gu, Lin
AU - Kloc, Christian
AU - Zhang, Hua
PY - 2018/3/1
Y1 - 2018/3/1
N2 - 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, Mo0.5W0.5S2, 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.
AB - 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, Mo0.5W0.5S2, 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.
KW - hydrogen evolution
KW - metallic 1T phase
KW - MoS2, MoSSe
KW - nanodots
KW - transition metal dichalcogenides
UR - http://www.scopus.com/inward/record.url?scp=85040695325&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85040695325&origin=recordpage
U2 - 10.1002/adma.201705509
DO - 10.1002/adma.201705509
M3 - RGC 21 - Publication in refereed journal
SN - 0935-9648
VL - 30
JO - Advanced Materials
JF - Advanced Materials
IS - 9
M1 - 1705509
ER -
