Chain-ordered Pt atoms with delocalized electronic structure for improved hydrogen production

Area of Science:

• Materials Science
• Catalysis
• Nanotechnology

Background:

• Single-atom chains are the smallest one-dimensional structures, exhibiting unique quantized behaviors.
• Interest is growing in the point-to-point interactions between neighboring metal atoms in 1D chains for catalytic applications.
• Understanding these interactions is crucial for designing advanced catalysts.

Purpose of the Study:

• To controllably fabricate platinum (Pt) chains and single atoms in molybdenum disulfide (MoS2) films.
• To investigate and compare the catalytic behaviors of Pt chains and single atoms in hydrogen production.
• To explore the synergistic effects of 1D metal atom arrangements in electrocatalysis.

Main Methods:

• Controllable fabrication of Pt chains and single atoms within MoS2 films.
• Combined theoretical calculations and experimental measurements (field effect transistor, micro-electrochemical).
• Analysis of electron densities, Gibbs free energy, and catalytic performance.

Main Results:

• Pt chains exhibit significant delocalized electron densities and metallic behavior.
• A unique center site in Pt chains shows lower Gibbs free energy for hydrogen production compared to single atoms.
• Tunable chain density up to 2.82 Pt/nm2 achieved, leading to competitive turnover frequency.
• Demonstrated potential for wafer-scale hydrogen production.

Conclusions:

• Single-atom chains in MoS2 possess distinct electronic properties beneficial for electrocatalysis.
• The synergistic effect in 1D Pt chains enhances catalytic activity for hydrogen production.
• Tunable chain density offers a pathway for optimizing and scaling up electrocatalytic processes.