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Abstract
Transition metal dichalcogenide (TMD) heterostructures have been discovered to have improved catalytic activity towards the hydrogen evolution reaction (HER). This study explores the stability and HER catalytic activity including reaction kinetics of heterolayers of different TMDs (MoS2, MoSe2 and WS2). The stability of the heterolayers varied with those having an overlayer of electrodeposited MoS2 being more stable as compared to those with MoSe2 overlayer which degraded with each scan in acidic media. Investigation into the HER kinetics of the heterolayers involved Tafel analysis and electrochemical rate constant calculation. There was an improvement in Tafel values calculated in comparison to reported values for these heterolayers. WS2/MoS2 and MoSe2/MoS2 heterolayers registered rate constants of (3.20 ± 0.10) × 10−4 cm s−1 and (1.73 ± 0.03) × 10−4 cm s−1 respectively, which was an improvement of up to an order of magnitude compared to the reported rate constant of electrodeposited MoS2 of (3.17 ± 0.30) × 10−5 cm s−1. All this highlights the improved HER catalytic activity of the heterolayers.
Original language | English |
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Article number | 107678 |
Number of pages | 8 |
Journal | Electrochemistry Communications |
Volume | 160 |
Early online date | 9 Feb 2024 |
DOIs | |
Publication status | Published - Mar 2024 |
Bibliographical note
Funding Information:The authors wish to thank Dr Nigel Neate (Nanoscale and Microscale Research Centre, University of Nottingham) and Dr Marcos Fernandez-Villamarin (School of Chemical Engineering, University of Birmingham) for assistance in performing FIB-SEM and Spectroscopic Ellipsometry measurements respectively. NVR thanks The Leverhulme Trust (RPG-2019-146) and TM thanks the Government of Botswana (TR184730) for funding. TA and TF acknowledge support of the Leverhulme Trust (Leverhulme International Professorship, LIP-2021-011) and the University of Birmingham.
Publisher Copyright:
© 2024 The Author(s)
Keywords
- Heterostructures
- Hydrogen evolution
- Reaction kinetics
- Tafel analysis
- Transition metal dichalcogenides
ASJC Scopus subject areas
- Electrochemistry
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Leverhulme International Professorships - Tomislav Friscic
Friscic, T. (Principal Investigator)
12/09/22 → 11/09/27
Project: Research
-
Recycling Critical Metals: Making Catalysts Directly from Waste
Rees, N. (Principal Investigator)
13/01/20 → 27/09/23
Project: Research