A sigh-performance hydrogen gas sensor based on Ag/Pd nanoparticle-functionalized ZnO nanoplates

Area of Science:

• Materials Science
• Chemical Engineering
• Sensor Technology

Background:

• Hydrogen (H2) is a key clean energy carrier, but its high explosivity necessitates sensitive detection methods.
• Existing sensors often lack the required performance for real-time, low-concentration H2 monitoring.

Purpose of the Study:

• To develop and evaluate a high-performance hydrogen gas sensor using Ag/Pd nanoparticle-functionalized ZnO nanoplates.
• To investigate the synergistic effects of bimetallic nanoparticles and ZnO nanostructures on H2 sensing capabilities.

Main Methods:

• Synthesis of bimetallic Ag/Pd nanoparticles (average size 8 nm).
• Decoration of ZnO nanoplates with Ag/Pd nanoparticles.
• Fabrication and testing of the H2 gas sensor, evaluating response, recovery, and selectivity.

Main Results:

• The Ag/Pd-doped ZnO sensor (0.025 wt% Ag/Pd) demonstrated a high response (Ra/Rg = 78 for 500 ppm H2).
• The sensor exhibited fast response and recovery times.
• Excellent selectivity for H2 detection over interfering gases (CO, NH3, H2S, VOCs) was observed.

Conclusions:

• Bimetallic Ag/Pd-functionalized ZnO nanoplates offer superior H2 gas sensing performance.
• The enhanced sensing is attributed to ZnO morphology and the synergistic catalytic effect of Ag/Pd nanoparticles.
• This material shows significant potential for industrial H2 concentration monitoring.