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Electrocatalysis on Edge-Rich Spiral WS2 for Hydrogen Evolution
journal contribution
posted on 2019-08-23, 13:34 authored by Prasad
V. Sarma, Arijit Kayal, Chithra H. Sharma, Madhu Thalakulam, J. Mitra, M. M. ShaijumonTransition metal dichalcogenides
(TMDs) exhibit promising catalytic
properties for hydrogen generation, and several approaches including
defect engineering have been shown to increase the active catalytic
sites. Despite preliminary understandings in defect engineering, insights
on the role of various types of defects in TMDs for hydrogen evolution
catalysis are limited. Screw dislocation-driven (SDD) growth is a
line defect and yields fascinating spiral and pyramidal morphologies
for TMDs with a large number of edge sites, resulting in very interesting
electronic and catalytic properties. The role of dislocation lines
and edge sites of these spiral structures on their hydrogen evolution
catalytic properties is unexplored. Here we show that the large number
of active edge sites connected together by dislocation lines in the
vertical direction for a spiral WS2 domain results in exceptional
catalytic properties toward hydrogen evolution reaction. A micro-electrochemical
cell fabricated by photo- and electron beam-lithography processes
is used to study the electrocatalytic activity of a single spiral
WS2 domain, controllably grown by chemical vapor deposition.
Conductive atomic force microscopy studies show improved vertical
conduction for the spiral domain, which is compared with monolayer
and mechanically exfoliated thick WS2 flakes. The obtained
results are interesting and shed light on the role of SDD line defects,
which contribute to large number of edge sites without compromising
the vertical electrical conduction, on the electrocatalytic properties
of TMDs for hydrogen evolution.
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SDD line defectsconductionelectrocatalytichydrogen evolutionelectron beam-lithography processesedge sitesspiral WS 2 domainhydrogen evolution reactionWS 2 flakesdefect engineeringEdge-Rich Spiral WS 2TMDhydrogen evolution catalysisspiral WS 2 domain resultschemical vapor depositionroledislocation linesHydrogen Evolution Transition metal dichalcogenidesforce microscopy studies show
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