1T-MoS₂ Enriched Hierarchical MoS₂ /MoO₃ Produced by Phase Transformation for Efficient Hydrogen Evolution Reaction

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Transition metal sulfides, particularly MoS₂ (molybdenum disulfide), are extensively studied as electrocatalysts.
• MoS₂ exists in 1T and 2H phases, with varying catalytic properties.
• Developing highly active and stable MoS₂-based catalysts is a key research objective.

Purpose of the Study:

• To develop a phase-controlled method for synthesizing MoS₂/MoO₃ heterojunctions.
• To investigate the electrocatalytic performance of the synthesized heterojunction for the hydrogen evolution reaction.

Main Methods:

• A simple hydrothermal and acid treatment sequence was employed.
• Phase-controlled synthesis of MoS₂/MoO₃ heterojunctions, enriched in the 1T-MoS₂ phase.

Main Results:

• The synthesized MoS₂/MoO₃ heterojunction exhibits a unique three-dimensional structure and a large active surface area.
• The catalyst achieved a low overpotential and high catalytic current density for the hydrogen evolution reaction.
• Excellent long-term stability was demonstrated for the hydrogen evolution reaction.

Conclusions:

• The phase-controlled synthesis of 1T-MoS₂-enriched MoS₂/MoO₃ heterojunctions is an effective strategy for developing advanced electrocatalysts.
• The unique structural and phase properties contribute to superior hydrogen evolution reaction performance and stability.