Abstract
The activity of transition metal sulfides for the hydrogen evolution reaction (HER) can be increased by sulfur-enrichment of active metal-sulfide sites. In this report, we investigate the electrochemical sulfidation of atmospherically aged WS2 nanoarrays with respect to enhancing HER activity. In contrast to MoS2, it is found that sulfidation diminishes HER activity. Electrochemical and XPS experiments suggest the involvement of insoluble tungsten oxides in the altered HER and electron transfer properties. This demonstrates the strong dependence of the transition metal dichalcogenide (TMD) composition with the successful sulfur incorporation and subsequent HER activity.
Highlights
IntroductionThe demand for sustainable sources of electrochemical hydrogen production [1] has triggered the development of the abundant and lowcost transition metal dichalcogenide (TMD) as substitutes to the best performing platinum group metal catalysts for the hydrogen evolution reaction (HER) [2,3,4,5]
The demand for sustainable sources of electrochemical hydrogen production [1] has triggered the development of the abundant and lowcost transition metal dichalcogenide (TMD) as substitutes to the best performing platinum group metal catalysts for the hydrogen evolution reaction (HER) [2,3,4,5].To improve their HER activity, research has focussed on the preparation of S-rich TMD structures which surpass the 1:2 M:X stoichiometry found in bulk materials [6,7,8]
We investigate the electrochemical sulfidation of atmospherically aged WS2 nanoarrays with respect to enhancing HER activity
Summary
The demand for sustainable sources of electrochemical hydrogen production [1] has triggered the development of the abundant and lowcost TMDs as substitutes to the best performing platinum group metal catalysts for the hydrogen evolution reaction (HER) [2,3,4,5]. To improve their HER activity, research has focussed on the preparation of S-rich TMD structures which surpass the 1:2 M:X stoichiometry found in bulk materials [6,7,8]. Changes in the electrocatalytic behaviour are understood via monitoring surface composition, morphology, and electron transfer properties over a one month period by XPS, SEM, and voltammetric experiments
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