Monoatomic Platinum-Anchored Metallic MoS₂: Correlation between Surface Dopant and Hydrogen Evolution

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Developing cost-effective and efficient electrocatalysts is crucial for the hydrogen evolution reaction (HER).
• Atomic-level catalyst design offers a promising pathway for enhanced performance.
• Molybdenum disulfide (MoS2) is a potential material, but its intrinsic activity for HER needs improvement.

Purpose of the Study:

• To rationally design and synthesize a novel electrocatalyst for the hydrogen evolution reaction (HER) at the atomic level.
• To investigate the structural and electronic properties of platinum single atoms doped onto MoS2.
• To evaluate the enhanced HER performance resulting from the single-atom decoration.

Main Methods:

• Synthesis of metallic MoS2 decorated with platinum single atoms.
• Characterization using electron microscopy and synchrotron X-ray techniques.
• Theoretical calculations to understand atomic bonding and active sites.
• Electrochemical testing to assess HER performance.

Main Results:

• Platinum single atoms were successfully doped onto the surface of MoS2, bonding with sulfur atoms.
• The Pt-MoS2 interface revealed Pt single atoms acting as critical active centers for capturing protons (H+).
• The optimized Pt-MoS2 catalysts exhibited significantly enhanced HER performance compared to pristine MoS2.

Conclusions:

• Single-atom platinum decoration on MoS2 creates highly active sites for the hydrogen evolution reaction.
• The observed enhancement is attributed to the single-atom coordination effect and efficient proton capture.
• This monatomic riveting strategy provides a new approach for designing advanced hybridized electrocatalysts.