Cyanogel-Transformed Porous Palladium and Iron Framework Intermixed with rGO for Wearable Hydrogen Sensing

Area of Science:

• Materials Science
• Chemical Engineering
• Sensor Technology

Background:

• Wearable hydrogen (H2) sensors are critical for monitoring leaks during H2 transportation and storage.
• Existing sensors often lack the desired ppm-level detection limits and fast response times at room temperature.

Purpose of the Study:

• To develop a wearable H2 sensor capable of high sensitivity and rapid response at ambient temperatures.
• To investigate the synergistic effects of material composition and structure on H2 sensing performance.

Main Methods:

• Synthesis of a novel material: palladium and iron framework (Pd-Fe FW) intermixed with reduced graphene oxide (rGO).
• Fabrication of wearable sensing devices integrated with the rGO//Pd-Fe FW on paper and flexible printed circuit boards.
• Utilized perceptron learning algorithm and principal component analysis for H2 leakage identification.

Main Results:

• The synthesized rGO//Pd-Fe FW exhibited a porous structure with interconnected Pd-Fe nanoparticles and evenly distributed rGO.
• Achieved a low detection limit of 2 ppm and a rapid response time of 2 seconds for 1 v/v% H2 at room temperature.
• Demonstrated reliable sensing responses in practical wearable devices.

Conclusions:

• The developed wearable H2 sensor offers excellent performance due to the synergistic effects between Pd-Fe FW and rGO.
• The sensor is suitable for practical H2 leakage monitoring in transportation and storage applications.
• This work advances the development of safety monitoring systems for hydrogen energy.