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Publication . Article . 2020

The Characterisation of Electrodeposited MoS2 Thin Films on a Foam-Based Electrode for Hydrogen Evolution

Ramunas, Levinas; Natalia, Tsyntsaru; Henrikas, Cesiulis;
Open Access
Published: 02 Nov 2020 Journal: Catalysts, volume 10, page 1,182 (eissn: 2073-4344, Copyright policy )
Publisher: MDPI AG
Country: Lithuania
Abstract

to the electrolyte. To reveal the role of hypophosphite, X-ray photoelectron spectroscopy (XPS) analysis was carried out in addition to scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). MoS2 films, electrodeposited at various charges passed through the cell (catalyst loadings), were tested for their catalytic activity towards hydrogen evolution in 0.5 M H2SO4. Polarisation curves and Tafel slope analysis revealed that the electrodeposited MoS2 films are highly active. Namely, Tafel slopes fell within the 40&ndash

0.3 V), and two clear time constants were distinguished. Through equivalent electrical circuit analysis, the experimental data were fitted to the appropriate model, and the obtained values of the circuit components were examined as a function of overpotential. It was found that the addition of NaH2PO2 into the electrodeposition solution affects the intrinsic activity of the material. Finally, a method is proposed to approximate the number of active sites from impedance data.

Molybdenum sulphide is an emerging precious-metal-free catalyst for cathodic water splitting. As its active sites catalyse the Volmer hydrogen adsorption step, it is particularly active in acidic media. This study focused on the electrochemical deposition of MoS2 on copper foam electrodes and the characterisation of their electrocatalytic properties. In addition, the electrodeposition was modified by adding a reducing agent&mdash

1 range. The behaviour of as-deposited films was also evaluated by electrochemical impedance spectroscopy over a wide overpotential range (0 to &minus

sodium hypophosphite&mdash

50 mV dec&minus

Subjects by Vocabulary

Microsoft Academic Graph classification: Dielectric spectroscopy Overpotential Chemical engineering X-ray photoelectron spectroscopy Electrocatalyst Tafel equation Electrolyte Water splitting Materials science Hypophosphite chemistry.chemical_compound chemistry

Library of Congress Subject Headings: lcsh:Chemical technology lcsh:TP1-1185 lcsh:Chemistry lcsh:QD1-999

Subjects

Physical and Theoretical Chemistry, Catalysis, molybdenum sulphide ; electrodeposition ; hydrogen evolution reaction ; water splitting ; electrocatalysis ; electrochemical impedance spectroscopy ; active sites, molybdenum sulphide, electrodeposition, hydrogen evolution reaction, water splitting, electrocatalysis, electrochemical impedance spectroscopy, active sites

Related Organizations
Funded by
EC| SMARTELECTRODES
Project
SMARTELECTRODES
Multiscaled Smart Metallic and Semiconductor Electrodes for Electrochemical Processing and Devices
  • Funder: European Commission (EC)
  • Project Code: 778357
  • Funding stream: H2020 | MSCA-RISE
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