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Electrodeposition of Amorphous Molybdenum Chalcogenides from Ionic Liquids and Their Activity for the Hydrogen Evolution Reaction

Author:
Redman, Daniel W., Rose, Michael J., Stevenson, Keith J.
Source:
Langmuir 2017 v.33 no.37 pp. 9354-9360
ISSN:
1520-5827
Subject:
X-ray photoelectron spectroscopy, corrosion, hydrogen production, ionic liquids, molybdenum, nanoparticles, scanning electron microscopy, ultraviolet-visible spectroscopy
Abstract:
This work reports on the general electrodeposition mechanism of tetrachalcogenmetallates from 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. Both tetrathio- and tetraselenomolybdate underwent anodic electrodeposition and cathodic corrosion reactions as determined by UV–vis spectroelectrochemistry. Electrodeposition was carried out by cycling the potential between the anodic and cathodic regimes. This resulted in a film of densely packed nanoparticles of amorphous MoSₓ or MoSeₓ as determined by SEM, Raman, and XPS. The films were shown to have high activity for the hydrogen evolution reaction. The onset potential (J = 1 mA/cm²) of the MoSₓ film was E = −0.208 V vs RHE, and that of MoSeₓ was E = −0.230 V vs RHE. The Tafel slope of MoSₓ was 42 mV/decade, and that of MoSeₓ was 59 mV/decade.
Agid:
5804647