Three-Dimensional Porous Carbon/Nitrogen Framework-Decorated Palladium Nanoparticles for Stable and...

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Hydrogen (H₂) is a promising energy carrier, but its explosive mixtures with air necessitate reliable sensors.
• Existing H₂ sensors often lack performance across a wide concentration range.

Purpose of the Study:

• To develop a robust H₂ sensor with a wide detection range.
• To investigate the sensing mechanism of palladium nanoparticles on a carbon/nitrogen framework.

Main Methods:

• Synthesized palladium nanoparticles (Pd NPs) on a 3D carbon/nitrogen (CN) porous framework.
• Constructed Mott-Schottky heterojunctions utilizing the work function difference between Pd NPs and the CN framework.
• Tested H₂ sensing performance at room temperature across various concentrations.

Main Results:

• Achieved H₂ detection from 200 ppm to 40 v/v % with fast response and recovery times.
• Demonstrated excellent long-term stability, maintaining reliable sensing after 142 days.
• The Mott-Schottky heterojunction design facilitated efficient H₂ dissociation.

Conclusions:

• The Pd NPs@CN 3D framework enables wide-concentration-range, stable H₂ sensing at room temperature.
• This technology provides a foundation for advanced H₂ leakage detection systems.
• The sensor's stability is critical for the safety of the future hydrogen economy.