Impact Electrochemistry of MoS 2 : Electrocatalysis and Hydrogen Generation at Low Overpotentials.
Tshiamo ManyepedzaJames M CourtneyAbigail SnowdenChristopher R JonesNeil V ReesPublished in: The journal of physical chemistry. C, Nanomaterials and interfaces (2022)
MoS 2 materials have been extensively studied as hydrogen evolution reaction (HER) catalysts. In this study nanoparticulate MoS 2 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 MoS 2 , 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.
Keyphrases
- room temperature
- visible light
- early onset
- quantum dots
- highly efficient
- reduced graphene oxide
- gas chromatography
- transition metal
- mass spectrometry
- late onset
- tandem mass spectrometry
- systematic review
- ionic liquid
- high resolution
- magnetic resonance
- gold nanoparticles
- human health
- high speed
- gas chromatography mass spectrometry
- atomic force microscopy
- metal organic framework
- bioinformatics analysis
- fluorescence imaging
- single molecule
- electron transfer