Loading Pt Nanoparticles on Ultrathin Amorphous Nanobelts for Enhanced Hydrogen Production

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Developing efficient and stable electrocatalysts for the hydrogen evolution reaction (HER) is crucial for clean energy technologies.
• Metal-support interactions in loaded structures are key for designing HER electrocatalysts, but achieving both high activity and stability remains challenging.

Purpose of the Study:

• To construct a novel crystalline/amorphous Pt NPs/CNWOx NBs heterostructure for improved HER electrocatalytic performance.
• To investigate the synergistic effects of the composite structure, heterogeneous interface, and platinum nanoparticles on catalytic activity and stability.

Main Methods:

• Anchoring platinum nanoparticles (Pt NPs) onto ultrathin crystalline niobium oxide nanobelts (CNWOx NBs) to form a crystalline/amorphous heterostructure.
• Evaluating the HER catalytic performance in 0.5 M H2SO4 and 1 M KOH.
• Conducting long-term stability tests to assess catalyst durability.

Main Results:

• The Pt NPs/CNWOx NBs heterostructure exhibited significantly lower overpotentials for HER compared to bare CNWOx NBs, achieving 35 mV in acidic and 60 mV in alkaline media at 10 mA cm-2.
• The catalyst demonstrated superior performance to commercial Pt/C and maintained its activity with negligible degradation after extended stability tests.
• The crystalline/amorphous structure, heterogeneous interface, and Pt introduction synergistically enhanced the number of active sites and intrinsic activity.

Conclusions:

• The crystalline/amorphous Pt NPs/CNWOx NBs heterostructure is a highly active and stable electrocatalyst for HER in both acidic and alkaline environments.
• The unique composite structure effectively leverages fast electron transfer from crystalline materials and active site exposure from amorphous materials.
• This work provides a promising strategy for designing advanced electrocatalysts by combining crystalline and amorphous components at heterogeneous interfaces.