Related Experiment Video
Updated: May 16, 2025

Hydrogen Production and Utilization in a Membrane Reactor
Published on: March 10, 2023
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.
Abstract:
The hydrogen spillover is considered a powerful strategy for improving the kinetics of hydrogen evolution reaction (HER) due to the decoupling of hydrogen adsorption and desorption. However, the hydrogen spillover rate strongly depends on the metal-support interfaces, and the Fermi levels (Ef) difference between metal and support hinders the occurrence of hydrogen spillover. Here, we prepared platinum (Pt) doped on molybdenum disulfide (MoS2) with sulfur vacancies (Sv) catalyst (Pt/Sv-MoS2) and investigated the internal relationship between metal-support interfaces and hydrogen spillover mechanism. The experimental and theoretical results show that sulfur (S) vacancies reduce the work function (ΔΦ) at the metal-support interface, thus accelerating the migration rate of hydrogen from Pt to Sv-MoS2. Meanwhile, the introduction of S vacancies promotes the high dispersion of Pt nanoparticles (Pt NPs) and weakens the electron supply from Pt to MoS2, facilitating active hydrogen (*H) adsorption step and thus increasing the hydrogen coverage on the Pt sites. Consequently, the prepared Pt/Sv-MoS2 catalyst exhibited significantly enhanced HER activity, achieving an overpotential of 26 mV at 10 mA·cm-2 and a Tafel slope of only 28 mV·dec-1, which is superior to commercial 20 % Pt/C.
More Related Videos
14:11Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
Published on: March 29, 2016
05:51Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
Published on: July 19, 2019
Related Concept Videos
Reduction of Alkenes: Catalytic Hydrogenation
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
Hydrogen Bonds
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
Hydroboration-Oxidation of Alkenes
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide