MoS2 and WS2 nanocone arrays: Impact of surface topography on the hydrogen evolution electrocatalytic activity and mass transport

Escalera-López, D, Griffin, R, Isaacs, M, Wilson, K, Palmer, R and Rees, N 2018, 'MoS2 and WS2 nanocone arrays: Impact of surface topography on the hydrogen evolution electrocatalytic activity and mass transport', Applied Materials Today, vol. 11, pp. 70-81.


Document type: Journal Article
Collection: Journal Articles

Title MoS2 and WS2 nanocone arrays: Impact of surface topography on the hydrogen evolution electrocatalytic activity and mass transport
Author(s) Escalera-López, D
Griffin, R
Isaacs, M
Wilson, K
Palmer, R
Rees, N
Year 2018
Journal name Applied Materials Today
Volume number 11
Start page 70
End page 81
Total pages 12
Publisher Elsevier
Abstract We report the fabrication and electrochemical study of edge-abundant transition metal dichalcogenide (TMD) nanocone arrays. Time-dependent etching by sequential use of isotropic O 2 and anisotropic SF 6 /C 4 F 8 plasmas on nanosphere monolayer-modified TMD crystals results in very high coverage nanocone array structures with tunable aspect ratios and interspacings. Electrochemical characterization of these arrays via the hydrogen evolution reaction (HER), using a low proton concentration electrolyte (2 mM HClO 4 , 0.1 M NaClO 4 ) to reveal morphology-dependent mass transport features at the proton diffusion-controlled region, show significant changes in electrocatalytic behaviour at both WS 2 and MoS 2 : notably onset potential shifts of 100 and 200 mV, and Tafel slope decreases of 50 and 120 mV dec -1 respectively. These improvements vary according to the geometry of the arrays and the availability of catalytic edge sites, and thus the observed electrochemical behaviour can be rationalized via kinetic and mass transport effects.
Subject Catalysis and Mechanisms of Reactions
Keyword(s) Hydrogen evolution
Nanoelectrode array
Plasma etching
Transition metal dichalcogenides
DOI - identifier 10.1016/j.apmt.2018.01.006
Copyright notice © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license 4.0/
ISSN 2352-9407
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 6 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 0 times in Scopus Article
Altmetric details:
Access Statistics: 5 Abstract Views  -  Detailed Statistics
Created: Tue, 26 Mar 2019, 09:36:00 EST by Catalyst Administrator
© 2014 RMIT Research Repository • Powered by Fez SoftwareContact us