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Enhanced Hydrogen Evolution Catalysis from Chemically Exfoliated Metallic MoS2 Nanosheets
journal contribution
posted on 2013-07-17, 00:00 authored by Mark A. Lukowski, Andrew
S. Daniel, Fei Meng, Audrey Forticaux, Linsen Li, Song JinPromising catalytic activity from
molybdenum disulfide (MoS2) in the hydrogen evolution reaction
(HER) is attributed to
active sites located along the edges of its two-dimensional layered
crystal structure, but its performance is currently limited by the
density and reactivity of active sites, poor electrical transport,
and inefficient electrical contact to the catalyst. Here we report
dramatically enhanced HER catalysis (an electrocatalytic current density
of 10 mA/cm2 at a low overpotential of −187 mV vs
RHE and a Tafel slope of 43 mV/decade) from metallic nanosheets of
1T-MoS2 chemically exfoliated via lithium intercalation
from semiconducting 2H-MoS2 nanostructures grown directly
on graphite. Structural characterization and electrochemical studies
confirmed that the nanosheets of the metallic MoS2 polymorph
exhibit facile electrode kinetics and low-loss electrical transport
and possess a proliferated density of catalytic active sites. These
distinct and previously unexploited features of 1T-MoS2 make these metallic nanosheets a highly competitive earth-abundant
HER catalyst.
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crystal structuresitedensityhydrogen evolution reactionunexploited featuresTafel slopeStructural characterizationEnhanced Hydrogen Evolution CatalysismVHER catalysiselectrode kineticscatalystmolybdenum disulfideRHEMoS 2 polymorph exhibitelectrochemical studiesnanosheetlithium intercalationChemically Exfoliated Metallic MoS 2 NanosheetsPromising
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