Crystal boundaries help hydrogen sensors work in hot, humid air
Hydrogen could play an important role in cleaner energy systems, but even small leaks can create safety risks. Reliable sensors are therefore essential wherever hydrogen is produced, stored, transported or used. A persistent problem is humidity: water molecules can cover the active surfaces of hydrogen detectors and prevent them from responding accurately, particularly in hot, moisture-rich…
Researchers have created a catalytic hydrogen sensor that works effectively even in hot, humid environments. The sensor, developed by an international team including Tohoku University's Advanced Institute for Materials Research, the University of Utah, and Pacific Northwest National Laboratory, relies on palladium nanoparticles with abundant grain boundaries.
These grain boundaries are crucial in resisting moisture interference, allowing the sensor to detect hydrogen accurately even when water molecules cover the active surfaces of traditional hydrogen detectors. The device can sense hydrogen concentrations as low as 100 parts per million at temperatures up to 80°C and relative humidity levels up to 90%.
This performance is remarkable, as conventional sensors often struggle in such conditions. The researchers' experiments showed that grain boundaries facilitate palladium hydride formation, which weakens water adsorption and preserves catalytic activity. This discovery highlights the potential of grain-boundary engineering for safer hydrogen monitoring in various industrial applications and future hydrogen-energy infrastructure.
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