Undercoordinated Two-Dimensional Pt Nanoring Stabilized by a Ring-on-Sheet Nanoheterostructure for Highly Efficient...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Platinum (Pt) is a key electrocatalyst for green hydrogen production in alkaline media.
• Two-dimensional (2D) Pt nanocatalysts offer high atomic efficiency but often suffer from poor structural stability.
• Modulating surface active sites is crucial for enhancing catalytic performance.

Purpose of the Study:

• To synthesize a stable 2D Pt-based nanoheterostructure with enhanced catalytic activity.
• To investigate the performance of the novel structure in the electrocatalytic hydrogen evolution reaction (HER).
• To provide insights into designing durable and efficient 2D nanocatalysts.

Main Methods:

• Synthesis of a 2D ring-on-sheet nanoheterostructure using rhodium (Rh) as a support for platinum (Pt).
• Characterization of the nanoheterostructure's morphology and surface active sites.
• Evaluation of the electrocatalytic activity and stability for hydrogen evolution reaction in alkaline media.

Main Results:

• A defect-rich Pt nanoring stabilized by an ultrathin 2D Rh support was successfully synthesized.
• The Rh@Pt nanoring exhibited significantly enhanced activity and stability for HER compared to controls.
• The nanostructure demonstrated a high density of low-coordination Pt sites, contributing to improved performance.

Conclusions:

• The developed 2D Rh@Pt nanoring structure offers a promising platform for efficient and durable electrocatalysis.
• This design strategy overcomes the stability limitations of traditional 2D Pt nanostructures.
• The findings advance the development of advanced catalysts for green hydrogen production.