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Electrodeposited Transition Metal Dichalcogenides for Use in Hydrogen Evolution Electrocatalysts


 Hydrogen is a promising alternative to gasoline due to its energy density and ability to burn cleanly. However, to make hydrogen a more viable alternative energy, affordable and durable electrocatalysts must be developed to replace expensive catalysts such as platinum. Transition metal dichalcogenides (TMDs) are a promising alternative to platinum because they are abundant, inexpensive, and have a tunable structure. There are various ways to produce TMD films including chemical and mechanical exfoliation, chemical vapor deposition (CVD), and electrodeposition. Exfoliation and CVD techniques often require transfer from the growth substrate to an electrode, which introduces impurities to the film. Electrodeposition, however, provides a way to produce TMDs directly on the electrode without the need for transfer with excellent surface coverage. This work uses electrodeposition to produce TMD and TMD-bi-layer electrodes for electrocatalytic hydrogen evolution reaction. The results presented include cost-effective deposition techniques along with enhanced proton reduction activity for the bi-layer TMD structure consisting of MoS2 and MoSe2, which suggests that the electron transfer kinetics from the conductive glass substrate to the top-layer are enhanced with a MoS2 layer. Furthermore, the bilayer structures are characterized via XPS, XPS depth-profiling, and SEM-EDS for enhanced understanding of the structure synthesized.