Unconventional-Phase 1T'-Transition Metal Dichalcogenide Monolayers Grown on Amorphous Templates for Highly Efficient...

Area of Science:

• Materials Science
• Catalysis
• Renewable Energy

Background:

• Platinum (Pt) catalysts are effective for the hydrogen evolution reaction (HER) but are expensive and scarce.
• Two-dimensional transition metal dichalcogenides (TMDs), especially in the 1T' phase, are promising HER alternatives but challenging to synthesize with purity and stability.
• Developing cost-effective and stable catalysts is crucial for advancing clean energy technologies like hydrogen production.

Purpose of the Study:

• To develop a facile wet-chemical method for synthesizing high-phase-purity and stable 1T'-TMD monolayers.
• To construct core-shell nanoparticles (NPs) using amorphous P-doped Pd NPs as templates.
• To investigate the catalytic performance and stability of these novel materials for the hydrogen evolution reaction (HER).

Main Methods:

• Utilized amorphous P-doped Pd nanoparticles (a-PdP NPs) as templates for synthesizing 1T'-TMD monolayers (MLs).
• Employed a wet-chemical approach to create a-PdP@1T'-TMD core-shell NPs, including MoS₂, WS₂, and MoWS₂.
• Conducted experimental and theoretical analyses to understand catalyst formation and stabilization mechanisms.

Main Results:

• Successfully synthesized high-phase-purity and stable 1T'-TMD MLs using the template method.
• The a-PdP@1T'-MoS₂ catalyst demonstrated excellent HER performance with a low overpotential (-182.3 mV at 1,000 mA·cm^-2) and remarkable stability (>500 h).
• The catalyst outperformed commercial Pt/C and showed potential as a support for single-atom Pt, enhancing HER activity.

Conclusions:

• The developed wet-chemical method provides a general route to high-quality 1T'-TMD MLs.
• The a-PdP@1T'-MoS₂ catalyst is a highly efficient and stable alternative to Pt-based catalysts for HER.
• The a-PdP@1T'-TMD platform offers versatile applications in designing advanced electrocatalysts for clean energy.