MoSe 2 nanosheets and their graphene hybrids: synthesis, characterization and hydrogen evolution reaction studies
Abstract
MoSe2 nanosheets and MoSe2/graphene hybrids have been prepared by a facile hydrothermal method. The number of layers of the MoSe2 nanosheets is typically <10 as confirmed directly by transmission electron microscopy and indirectly by a red shift of the characteristic A1g Raman peak. The hydrogen evolution reaction (HER) studies show that the onset potentials of MoSe2 and MoSe2/RGO hybrids are only ∼0.15 V vs. RHE and ∼0.05 V vs. RHE, respectively, about 20–30 mV lower than those of MoS2 and its graphene hybrids reported previously. Density functional theory calculations reveal that the Gibbs free energy for atomic hydrogen adsorption (ΔG0H) on MoSe2 edges is closer to thermoneutral than that on MoS2, with an H coverage of about 75% on the edge under operating conditions, which is also higher than that of MoS2 reported in the literature. The consistency between the experimental and computational results indicates that MoSe2 nanosheets have potential to be a better HER catalyst than their MoS2 counterpart.
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Most research work has focused on MoS2 and WS2 in photocatalytic and electrocatalytic HERs, although other TMDs (e.g., TiS2, TaS2, MoSe2, and WSe2) also have the potential to serve as co-catalysts or supports for hydrogen evolution in photocatalytic or electrocatalytic processes.
“Thirdly, most research work has focused on MoS 2 and WS 2 in photocatalytic and electrocatalytic HERs, although other TMDs (e.g., TiS 2 , TaS 2 , MoSe 2 , and WSe 2 ) also have the potential to serve as co-catalysts or supports for hydrogen evolution in photocatalytic or electrocatalytic processes.”
From 2D Transition‐Metal‐Dichalcogenide‐Nanosheet‐Based Composites for Photocatalytic and Electrocatalytic Hydrogen Evolution Reactions (2016) · cites this paper as [181]
Most h10 values of MoS2-based electrocatalysts were greater than 220 mV in basic solutions, indicating sluggish HER kinetics and a high energy barrier of water dissociation in alkaline water splitting.
“However, most of the h10 (overpotential at 10 mA cm@2) of these MoS2-based electrocatalysts were >220 mV in basic solutions, indicating sluggish HER kinetics and a high energy barrier of water dissociation in alkaline water splitting.[19, 33, 34]”
From Boosting Alkaline Hydrogen Evolution Activity with Ni‐Doped MoS<sub>2</sub>/Reduced Graphene Oxide Hybrid Aerogel (2019) · cites this paper as [19]
An extra activated water dissociation step to form Hads is needed for HER in alkaline media.
“From the viewpoint of the mechanism of HER in alkaline media, an extra activated water dissociation step to form Hads (where Hads represents a H atom adsorbed at the active sites of the catalyst) is needed.”
From Boosting Alkaline Hydrogen Evolution Activity with Ni‐Doped MoS<sub>2</sub>/Reduced Graphene Oxide Hybrid Aerogel (2019) · cites this paper as [19]
Transition-metal dichalcogens (TMDs) such as MoS2, MoSe2, WS2, and WSe2 have great electrocatalytic activity for HER in acidic electrolytes.
“Of the catalysts available today, transition-metal dichalcogens (TMDs), such as MoS2, MoSe2, WS2, and WSe2, have great electrocatalytic activity for HER in acidic electrolytes,13−18”
From Integrated Energy Aerogel of N,S-rGO/WSe <sub>2</sub> /NiFe-LDH for Both Energy Conversion and Storage (2017) · cites this paper as [16]
MoSe2 nanosheets grown on graphene exhibit abundant catalytic edge sites and excellent electrical coupling to the underlying graphene network, resulting in relatively low onset potentials of −0.15 V vs RHE and 0.05 V vs RHE.
“Yang et al. found that MoSe2 nanosheets grown on graphene exhibit abundant catalytic edge sites and excellent electrical coupling to the underlying graphene network, resulting in relatively low onset potentials of −0.15 V vs RHE and 0.05 V vs RHE.40”
From Cotton Wool Derived Carbon Fiber Aerogel Supported Few-Layered MoSe<sub>2</sub> Nanosheets As Efficient Electrocatalysts for Hydrogen Evolution (2016) · cites this paper as [40]
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- Authors
- Tang, H., Dou, K., Kaun, C.-C., Kuang, Q., & Yang, S.
- Affiliations
- Hong Kong University of Science and Technology (HK)
- Research Center for Applied Science, Academia Sinica (TW)
- Corresponding author
- Yang, Shihe
- Venue
- J. Mater. Chem. A
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2014
- Volume
- 2
- Issue
- 2
- Pages
- 360-364
- ISSN
- 2050-7488 (ISSN-L)
- 2050-7496
- OpenAlex
- W2109957556
- Cited by
- 607
- References
- 4
- Citations by year
- 2026: 9 · 2025: 19 · 2024: 32 · 2023: 39 · 2022: 34 · 2021: 48 · 2020: 53 · 2019: 55 · 2018: 87 · 2017: 75 · 2016: 78 · 2015: 59 · 2014: 19
- FWCI
- 18.88
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Materials Chemistry A (publishedVersion)
- Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
- 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 › Advanced Photocatalysis Techniques
- Keywords
- MoSe2 nanosheets, hydrogen evolution reaction, electrocatalysis, hydrothermal synthesis, reduced graphene oxide, MoS2 comparison, hydrogen adsorption, edge sites, density functional theory
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