Researchers from Delft University of Technology have achieved a significant advancement in optical hydrogen sensing technology, demonstrating for the first time that these sensors can operate effectively at temperatures as low as -60°C. This development, published in Advanced Functional Materials on January 31, 2025, addresses a critical challenge for hydrogen detection in aerospace, arctic environments, and along hydrogen infrastructure.
The research team, led by Ziqing Yuan and Lars J. Bannenberg, focused on developing metal hydride materials that can reliably detect hydrogen in extremely cold conditions. Conventional hydrogen sensors struggle at sub-zero temperatures, but applications such as hydrogen-powered aircraft and vehicles operating in cold climates require sensors that function reliably down to -60°C.
How the technology works
The sensors operate on a relatively simple principle: when hydrogen is present in the environment, the metal hydride material absorbs it, causing measurable changes in optical properties. By monitoring changes in light transmission, the system can accurately determine hydrogen concentration without requiring any electrical current near the sensing area: a significant safety advantage.
Safe and hysteresis-free performance
A critical finding was that all tested materials showed no signs of phase transitions, plastic deformation, or hysteresis , at temperatures down to -60°C. This means the sensors provide consistent and reliable readings regardless of whether hydrogen concentration is increasing or decreasing, representing an essential feature for safety-critical applications.
This research is a significant step forward for hydrogen safety technology in cold environments, particularly for aerospace applications where temperatures can drop drastically at high altitudes. The new sensing materials enable the creation of inherently safe optical hydrogen sensors that can operate reliably in extreme conditions, supporting the expansion of hydrogen as a clean energy carrier.
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