Impact Electrochemistry of MoS2: Electrocatalysis and Hydrogen Generation at Low Overpotentials

Tshiamo Manyepedza, James M. Courtney, Abigail Snowden, Christopher R. Jones, Neil V. Rees

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Abstract

MoS2 materials have been extensively studied as hydrogen evolution reaction (HER) catalysts. In this study nanoparticulate MoS2 is explored as a HER catalyst through impact voltammetry. The onset potential was found to be −0.10 V (vs RHE) at pH 2, which was confirmed to be due to HER by scale-up of the impact experiment to generate and collect a sufficient volume of the gas to enable its identification as hydrogen via gas chromatography. This is in contrast to electrodeposited MoS2, which was found to be stable in pH 2 sulfuric acid solution with an onset potential of −0.29 V (vs RHE), in good agreement with literature. XPS was used to categorize the materials and confirm the chemical composition of both nanoparticles and electrodeposits, with XRD used to analyze the crystal structure of the nanoparticles. The early onset of HER was postulated from kinetic analysis to be due to the presence of nanoplatelets of about 1–3 trilayers participating in the impact reactions, and AFM imaging confirmed the presence of these platelets.
Original languageEnglish
JournalJournal of Physical Chemistry C
Early online date18 Oct 2022
DOIs
Publication statusE-pub ahead of print - 18 Oct 2022

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