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Defect-Driven hydrogen Evolution: Enhanced hydrogen spillover on Pt-MoS2 interface via sulfur vacancies.
Juan Du1, Tianfeng Cai1, Qiao Han1
1School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001 Liaoning, China.
Journal of Colloid and Interface Science
|April 5, 2025
Summary
Introducing sulfur vacancies in molybdenum disulfide (MoS2) enhances platinum (Pt) catalyst performance for the hydrogen evolution reaction (HER) by improving hydrogen spillover kinetics.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Hydrogen spillover is crucial for enhancing hydrogen evolution reaction (HER) kinetics by separating hydrogen adsorption and desorption.
- Metal-support interfaces and Fermi level differences significantly influence hydrogen spillover rates.
- Optimizing metal-support interactions is key to unlocking efficient hydrogen spillover.
Purpose of the Study:
- To investigate the relationship between metal-support interfaces and hydrogen spillover mechanisms.
- To enhance hydrogen evolution reaction (HER) activity using platinum (Pt) doped on molybdenum disulfide (MoS2) with sulfur vacancies (Sv).
Main Methods:
- Preparation of platinum (Pt) doped on molybdenum disulfide (MoS2) with sulfur vacancies (Sv) catalyst (Pt/Sv-MoS2).
- Experimental and theoretical investigations of metal-support interfaces and hydrogen spillover.
- Electrochemical characterization of HER activity, including overpotential and Tafel slope measurements.
Main Results:
- Sulfur (S) vacancies reduce the work function at the metal-support interface, accelerating hydrogen migration from Pt to Sv-MoS2.
- S vacancies promote high dispersion of Pt nanoparticles (Pt NPs) and weaken electron transfer from Pt to MoS2, enhancing active hydrogen adsorption.
- The Pt/Sv-MoS2 catalyst shows significantly improved HER activity with an overpotential of 26 mV at 10 mA·cm-2 and a Tafel slope of 28 mV·dec-1.
Conclusions:
- The prepared Pt/Sv-MoS2 catalyst exhibits superior HER performance compared to commercial 20% Pt/C.
- Sulfur vacancies are effective in tuning metal-support interfaces to promote hydrogen spillover and enhance HER kinetics.
- This study provides insights into designing advanced catalysts for efficient hydrogen production.
Keywords:
ElectrocatalystHydrogen evolution reactionHydrogen spilloverMetal-supporter interfaceSulfur vacanciesMore Related Videos
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