Boosting Hydrogen Evolution Kinetics with MoS₂-Decorated TiO₂ Nanotubes.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Efficient electrocatalysts are vital for sustainable hydrogen production.
• Platinum-based catalysts are effective but costly for the hydrogen evolution reaction (HER).
• Developing non-platinum alternatives for HER is a significant scientific challenge.

Purpose of the Study:

• To investigate the potential of a TiO2 NTs/MoS2 QDs heterojunction as a non-platinum HER electrocatalyst.
• To synthesize and characterize TiO2 NTs and MoS2 QDs.
• To evaluate the HER performance and mechanism of the fabricated heterojunction.

Main Methods:

• Anodization for TiO2 NTs synthesis.
• Electrosynthesis (chronopotentiometry) for MoS2 QDs preparation.
• Heterojunction formation via immersion/adsorption.
• Electrochemical characterization (HER polarization, EIS, Tafel slope).
• Structural and morphological analysis (XRD, SEM, TEM, EDX).

Main Results:

• The optimized TiO2 NTs/MoS2 QDs catalyst achieved an overpotential of 617 mV at 100 mA cm-2 for HER.
• This represents a significant improvement compared to bare TiO2 NTs (927 mV).
• Charge transfer resistance decreased from 475 Ω to 9.9 Ω, and a Tafel slope of 106 mV dec-1 indicated a Volmer-Heyrovsky mechanism.

Conclusions:

• The TiO2 NTs/MoS2 QDs heterojunction demonstrates enhanced HER activity and efficiency.
• This system offers a promising, cost-effective alternative to platinum-based electrocatalysts.
• The findings support the potential for scalable, sustainable hydrogen production using these novel materials.