Efficient hydrogen evolution from degenerate-doped p-type WS<sub>2</sub> electrocatalysts over a wide pH range

Siva, Pamula; Vasu, Kuraganti

doi:10.1039/d3ta07288f

J. Mater. Chem. A

2024

DOI: 10.1039/d3ta07288f

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Efficient hydrogen evolution from degenerate-doped p-type WS₂ electrocatalysts over a wide pH range

Pamula Siva,

Kuraganti Vasu

Abstract: Layered MoS2 and WS2 semiconductors are well-known electrocatalysts for hydrogen generation by electrochemical water splitting. However, their hydrogen evolution reaction (HER) activity is significantly affected in neutral and alkaline environments...

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Cited by 4 publications

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Ultra-small Ru0-loaded carbon nanotubes for highly efficient electrocatalytic H2 production over a wide pH range

Li,

Zhao,

Huang

et al. 2024

International Journal of Hydrogen Energy

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Ultra-small Ru0-loaded carbon nanotubes for highly efficient electrocatalytic H2 production over a wide pH range

Li,

Zhao,

Huang

et al. 2024

International Journal of Hydrogen Energy

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H₂ Regulates the Sulfur Vacancy of Mo-Doped WS₂ for Electrochemical Hydrogen Evolution Reaction

Liu,

Zhou,

Wang

et al. 2024

Energy Fuels

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The development of efficient and economical nonprecious metal electrocatalysts is crucial for advancing the industrialization of the hydrogen evolution reaction (HER) in water electrolysis. WS 2 has become a hotspot in HER research due to its unique physicochemical properties and potential applications. In this work, a series of Mo-WS 2 -n (n = 0, 0.3, 0.5 and 1.0, representing H 2 pressure) samples with abundant sulfur vacancies were prepared by utilizing H 2 as the structure directing agent (SDA). Among them, the Mo-WS 2 -0.5 sample possessing abundant sulfur vacancies demonstrated best acidic HER performance by displaying an overpotential of 146 mV at 10 mA cm −2 and the Tafel slope of 46.8 mV dec −1 , which is superior to most reported WS 2based electrocatalysts. Furthermore, Mo-WS 2 -0.5 exhibits good stability, proving its potential in practical applications. During the synthesis process, H 2 can effectively remove S atoms from WS 2 to create sulfur vacancies. Theoretical calculations unravel that both Mo doping and sulfur vacancies can significantly reduce the Gibbs free energy of hydrogen atom adsorption (ΔG H ) of WS 2 . This study not only offers new insights into understanding the effects of metal doping and sulfur vacancies in WS 2 on acidic HER, but also provides a practical approach for designing low-cost and high-performance non-noble metal electrocatalysts.

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Spent Zinc–Carbon Battery-Derived Carbon Nanoparticles Coupled with Transition Metal Dichalcogenides for Enhanced pH-Universal Hydrogen Evolution Reaction

Phu,

Le,

Tran

et al. 2024

ACS Appl. Energy Mater.

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Utilizing highly effective waste-into-value electrocatalysts for the hydrogen evolution reaction (HER) opens a sustainable route to economically beneficial and environmentally friendly hydrogen production. A simple strategy for reusing spent batteries involves enhancing HER performance by preparing electrocatalysts of the carbon anode in spent zinc−carbon batteries and transition metal dichalcogenide (TMDs) materials. In this study, carbon nanoparticles (C NPs ) are incorporated into the basal planes of MoS 2 and WS 2 using a simple ultrasonication method. C NPs @TMDs (C NPs @WS 2 and C NPs @ MoS 2 ) with fewer-layer structures and enhanced exposed active sites show promising catalytic activity for pH-universal HER. In acid, C NPs @WS 2 and C NPs @MoS 2 exhibit overpotentials of 0.34 and 0.42 V at 10 mA cm −2 , with Tafel slopes of 0.139 V dec −1 and 0.145 V dec −1 , respectively. The enhanced HER performance of C NPs @TMDs originates from their improved electrical conductivity and higher electrochemically active surface area. Alongside experimental results, density function theory (DFT) calculations reveal that incorporating carbon atoms on the TMD surface can efficiently tune the electronic properties of MoS 2 and WS 2 monolayers from semiconductor to semimetal and considerably reduces the hydrogen adsorption Gibbs free energies. These results indicate that highly effective HER catalysts with enhanced catalytic activity in universal pH media are fabricated via an economical and facile method, holding promise for practical applications and paving the way for battery recycling.

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Efficient hydrogen evolution from degenerate-doped p-type WS₂ electrocatalysts over a wide pH range

Abstract: Layered MoS2 and WS2 semiconductors are well-known electrocatalysts for hydrogen generation by electrochemical water splitting. However, their hydrogen evolution reaction (HER) activity is significantly affected in neutral and alkaline environments...

Cited by 4 publications

References 62 publications

Ultra-small Ru0-loaded carbon nanotubes for highly efficient electrocatalytic H2 production over a wide pH range

Ultra-small Ru0-loaded carbon nanotubes for highly efficient electrocatalytic H2 production over a wide pH range

H₂ Regulates the Sulfur Vacancy of Mo-Doped WS₂ for Electrochemical Hydrogen Evolution Reaction

Spent Zinc–Carbon Battery-Derived Carbon Nanoparticles Coupled with Transition Metal Dichalcogenides for Enhanced pH-Universal Hydrogen Evolution Reaction

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Efficient hydrogen evolution from degenerate-doped p-type WS2 electrocatalysts over a wide pH range

Abstract: Layered MoS2 and WS2 semiconductors are well-known electrocatalysts for hydrogen generation by electrochemical water splitting. However, their hydrogen evolution reaction (HER) activity is significantly affected in neutral and alkaline environments...

Cited by 4 publications

References 62 publications

Ultra-small Ru0-loaded carbon nanotubes for highly efficient electrocatalytic H2 production over a wide pH range

Ultra-small Ru0-loaded carbon nanotubes for highly efficient electrocatalytic H2 production over a wide pH range

H2 Regulates the Sulfur Vacancy of Mo-Doped WS2 for Electrochemical Hydrogen Evolution Reaction

Spent Zinc–Carbon Battery-Derived Carbon Nanoparticles Coupled with Transition Metal Dichalcogenides for Enhanced pH-Universal Hydrogen Evolution Reaction

Contact Info

Product

Resources

About

Efficient hydrogen evolution from degenerate-doped p-type WS₂ electrocatalysts over a wide pH range

H₂ Regulates the Sulfur Vacancy of Mo-Doped WS₂ for Electrochemical Hydrogen Evolution Reaction