Conductive Molybdenum Sulfide for Efficient Electrocatalytic Hydrogen Evolution
Abstract
Molybdenum sulfide (MoS 2 ) is a layered material with high activity for electrocatalytic hydrogen evolution reaction (HER). In conventional MoS 2 , the high electrical resistance between the layers hampers the bulk charge transfer and therefore greatly limits its performance in electrolysis. Herein, ultrathin MoS 2 nanosheets with bent layers on reduced graphene oxide (RGO) are reported. In sharp contrast to the bulk MoS 2 , the resulting MoS 2 has mostly 1 or 2 layers, and the layer distance is significantly expanded to ≈1 nm. From computational studies, the prepared MoS 2 with limited layer numbers and expanded layer distances has similar physical and chemical features with single-layer MoS 2 . Importantly, the bent single layer is electrically conductive and is intrinsically more active than a normal flat single layer. In addition, the unusual features of confined sizes and distorted lattices in the prepared MoS 2 can bring about plentiful active sites and are beneficial for mass diffusion during electrocatalysis. The hybrid material exhibits high activity for electrocatalytic HER, affording a current density of 10 mA cm -2 at a low overpotential of 66 mV.
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Controlling the uniform nanosize and dispersion of bulk MoS2 exposes more edge active sites.
“controlling the uniform nanosize and the dispersion of bulk MoS2 to expose more edge active sites.”
From S-Edge-rich Mo <sub>x</sub> S <sub>y</sub> arrays vertically grown on carbon aerogels as superior bifunctional HER/OER electrocatalysts (2019) · cites this paper as [33]
The Tafel slope of ∼56.24 mV dec−1 for Mo4S16@GCA suggests that the Volmer-Heyrovsky reaction is operative with electrochemical desorption of hydrogen as the rate-limiting step.
“the Tafel slope was determined to be ∼56.24 mV dec−1 for Mo4S16@GCA, and this low value suggests that the Volmer–Heyrovsky reaction is operative with the electrochemical desorption of hydrogen as the rate-limiting step.”
From S-Edge-rich Mo <sub>x</sub> S <sub>y</sub> arrays vertically grown on carbon aerogels as superior bifunctional HER/OER electrocatalysts (2019) · cites this paper as [33]
GCA not only acts as substrate but also conductive bridges between adjacent layers, reducing sluggish charge transfer in the interlayer.
“Notably, the GCA not only acts as the substrate but also conductive bridges between the adjacent layers, which reduce the sluggish charge transfer in the interlayer.”
From S-Edge-rich Mo <sub>x</sub> S <sub>y</sub> arrays vertically grown on carbon aerogels as superior bifunctional HER/OER electrocatalysts (2019) · cites this paper as [33]
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Aerogels-Inspired based Photo and Electrocatalyst for Water Splitting to Produce Hydrogen
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- Authors
- Gao, X., Qi, J., Wan, S., Zhang, W., Wang, Q., & Cao, R.
- Affiliations
- Shaanxi Normal University (CN)
- Nanjing Tech University (CN)
- Renmin University of China (CN)
- Corresponding author
- Zhang, Wei
- Wang, Qiang
- Cao, Rui
- Venue
- Small
- Publisher
- Wiley
- Published
- 2018-10-10
- Volume
- 14
- Issue
- 48
- Pages
- e1803361-e1803361
- ISSN
- 1613-6810 (ISSN-L)
- 1613-6829
- OpenAlex
- W2897860420
- Cited by
- 96
- References
- 8
- Citations by year
- 2026: 7 · 2025: 8 · 2024: 6 · 2023: 13 · 2022: 8 · 2021: 19 · 2020: 18 · 2019: 17
- FWCI
- 3.11
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Small (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Natural Science Foundation of China (21373112, 21503126, 21573139, 21773146)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › CO2 Reduction Techniques and Catalysts
- Keywords
- MoS2, electrocatalytic hydrogen evolution, ultrathin nanosheets, reduced graphene oxide, interlayer spacing, electrical conductivity, lattice distortion, active site, water electrolysis, overpotential
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