Low-Cost Hydrogen Sensor in the ppm Range with Purely Optical Readout

Area of Science:

• Materials Science
• Nanotechnology
• Sensor Technology

Background:

• Renewable energy transition necessitates reliable hydrogen energy carriers.
• Safe hydrogen utilization requires sensitive and robust leakage detection sensors.
• Conventional hydrogen sensors face limitations in sensitivity, reliability, and safety.

Purpose of the Study:

• To develop and present a novel, purely optical hydrogen sensor for reliable leakage detection.
• To demonstrate the sensor's performance across a wide range of hydrogen concentrations.
• To highlight the safety advantages of an optical readout system for hydrogen sensing.

Main Methods:

• Fabrication of a layered reactive sample with palladium nanodisks.
• Utilizing a fiber-coupled optical setup with LED, sensor, and photodiode.
• Probing and readout of the sample's reflectance changes with hydrogen partial pressure.

Main Results:

• The sensor reliably operates across a broad detection range (50–100,000 ppm).
• The optical readout system ensures inherent protection against ignition by electronic malfunctions.
• The sensor exhibits fast response times and enhanced robustness against aging compared to thin-film technologies.

Conclusions:

• The presented optical hydrogen sensor design is simple, feasible, and scalable for industrial applications.
• This technology offers a holistic approach to enhance safety in hydrogen monitoring.
• The sensor's performance characteristics make it a promising candidate for widespread adoption in the renewable energy sector.