2D Amino-Functionalized Black Phosphorus: A New Approach to Improve Hydrogen Gas Detection Performance

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Hydrogen is a promising clean energy source, but its safe utilization requires effective leak detection due to explosion risks.
• Existing hydrogen sensors often lack long-term stability or require specific operating conditions.
• Developing robust and sensitive hydrogen sensors is crucial for the widespread adoption of hydrogen energy.

Purpose of the Study:

• To develop a novel, long-term stable phosphorene-based sensor for hydrogen detection.
• To synthesize an air-stable phosphorene material through simple urea functionalization.
• To evaluate the sensor's performance, including sensitivity, selectivity, and stability under ambient conditions.

Main Methods:

• Phosphorene functionalization with urea to create an air-stable material.
• Fabrication of gas sensing films using the drop casting method.
• Comprehensive material characterization using SEM, XRD, XPS, and Raman spectroscopy.
• Performance evaluation including sensitivity, selectivity, and stability testing.
• Operando diffuse reflectance infrared Fourier transform spectroscopy for mechanism investigation.

Main Results:

• A stable, air-compatible phosphorene-based material was successfully synthesized.
• The developed sensor demonstrated high sensitivity (up to 700 ppm) and selectivity for hydrogen at room temperature.
• The sensor exhibited excellent long-term stability over five months under ambient conditions.
• Operando DRIFTS provided insights into the gas sensing mechanism.

Conclusions:

• Urea functionalization yields a stable phosphorene material suitable for gas sensing applications.
• The phosphorene-based sensor is a promising candidate for reliable hydrogen leak detection.
• The sensor's room-temperature operation and long-term stability offer practical advantages for hydrogen safety.