Tantalum-Palladium
Hysteresis-Free Optical Hydrogen Sensor Over 7 Orders of Magnitude in Pressure with Sub-Second Response
Lars Bannenberg (TU Delft - RID/TS/Instrumenten groep)
H. Schreuders (TU Delft - ChemE/Afdelingsbureau)
Bernard Dam (TU Delft - ChemE/Materials for Energy Conversion and Storage)
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Abstract
Hydrogen detection in a reliable, fast, and cost-effective manner is a prerequisite for the large-scale implementation of hydrogen in a green economy. Thin film Ta1−yPdy is presented as an effective optical sensing material with extremely wide sensing ranges covering at least 7 orders of magnitude in hydrogen pressure. Nanoconfinement of the Ta1−yPdy layer suppresses the first-order phase transitions present in bulk and ensures a sensing response free of any hysteresis. Unlike other sensing materials, Ta1−yPdy features the special property that the sensing range can be easily tuned by varying the Pd concentration without a reduction of the sensitivity of the sensing material. Combined with a suitable capping layer, sub-second response times can be achieved even at room temperature, faster than any other known thin-film hydrogen sensor.
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