Pure and Stable Metallic Phase Molybdenum Disulfide Nanosheets for Hydrogen Evolution Reaction

Overview

Journal Nat Commun

Specialty Biology

Date 2016 Feb 11

PMID 26861766

Citations 60

Authors

Xiumei Geng

Weiwei Sun

Wei Wu

Benjamin Chen

Alaa Al-Hilo

Mourad Benamara

Hongli Zhu

Fumiya Watanabe

Jingbiao Cui

Tar-Pin Chen

Affiliations

Soon will be listed here.

Abstract

Metallic-phase MoS2 (M-MoS2) is metastable and does not exist in nature. Pure and stable M-MoS2 has not been previously prepared by chemical synthesis, to the best of our knowledge. Here we report a hydrothermal process for synthesizing stable two-dimensional M-MoS2 nanosheets in water. The metal-metal Raman stretching mode at 146 cm(-1) in the M-MoS2 structure, as predicted by theoretical calculations, is experimentally observed. The stability of the M-MoS2 is associated with the adsorption of a monolayer of water molecules on both sides of the nanosheets, which reduce restacking and prevent aggregation in water. The obtained M-MoS2 exhibits excellent stability in water and superior activity for the hydrogen evolution reaction, with a current density of 10 mA cm(-2) at a low potential of -175 mV and a Tafel slope of 41 mV per decade.

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