Semiconducting Pt Structures Stabilized on 2D MoS₂ Crystals Enable Ultrafast Hydrogen Evolution

Area of Science:

• Materials Science
• Catalysis
• Nanotechnology

Background:

• Metallic platinum is a well-established catalyst for hydrogen evolution.
• The catalytic properties of semiconducting platinum, particularly at the nanoscale, remain underexplored.

Purpose of the Study:

• To investigate the catalytic activity of ultrathin semiconducting platinum structures.
• To understand the unique electronic properties of few-layer platinum.

Main Methods:

• Stabilization of two-atomic-layer (0.4 nm) platinum structures on 2D molybdenum disulfide (MoS2) crystals.
• Characterization of the electronic structure of ultrathin platinum, revealing a tunable band gap.

Main Results:

• Semiconducting platinum bilayers exhibit a band gap of 0.3-0.4 eV, distinct from metallic platinum nanoparticles and single atoms.
• These bilayers demonstrate significantly higher intrinsic activity for hydrogen evolution compared to Pt single atoms.
• Achieved hydrogen production rates approximately ten times higher than Pt single atom catalysts.
• Matched the activity of commercial Pt/C catalysts at three orders of magnitude lower platinum loading.

Conclusions:

• Ultrathin semiconducting platinum bilayers represent a novel class of highly active electrocatalysts.
• The unique electronic structure of these ultrathin films is responsible for their enhanced catalytic performance.
• This finding paves the way for developing more efficient and cost-effective catalysts for hydrogen production.