Hydrogen sensor detects 100 parts per million in hot, humid tests

Researchers have developed a hydrogen sensor that detects concentrations as low as 100 parts per million at 80°C and 90% relative humidity without an external heater, according to work published in Advanced Materials. Water can obstruct the active surfaces of hydrogen detectors, reducing their accuracy. The device uses palladium nanoparticles with interfaces between neighboring crystals that help hydrogen enter the metal and form palladium hydride. That material binds water weakly, keeping sensing sites accessible. Tests showed stable operation over 125 days. A portable prototype incorporating machine learning to account for temperature and humidity estimated hydrogen concentrations with deviations within 5% under randomized test conditions.