An optical hydrogen sensor based on a Pd-capped Mg thin film wedge

We report the proof of concept of a thin film device with a one-to-one relationship between the H 2 partial pressure and the lateral progression of a visible optical change along a thin film multilayer 70 mm long. The device basically consists of a sensing Mg layer with a thickness gradient. It expl...

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Bibliographic Details
Published inInternational journal of hydrogen energy Vol. 35; no. 22; pp. 12574 - 12578
Main Authors Palmisano, V., Filippi, M., Baldi, A., Slaman, M., Schreuders, H., Dam, B.
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.11.2010
Elsevier
Subjects
Alternative fuels. Production and utilization
Applied sciences
Devices
Energy
Exact sciences and technology
Fuels
Hydrogen
Hydrogen safety
Hydrogen storage
Magnesium
Multilayers
Optical hydrogen sensor
Palladium
Partial pressure
Reflection
Switchable mirror
Thin film
Thin films
Wedges
Optical hydrogen sensor
Hydrogen safety
Switchable mirror
Thin film
Thermodynamics
Multilayer
Hydrogen
Hydrides
Transition metal
Palladium
Pressure measurement
Hydrogenation
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Summary:We report the proof of concept of a thin film device with a one-to-one relationship between the H 2 partial pressure and the lateral progression of a visible optical change along a thin film multilayer 70 mm long. The device basically consists of a sensing Mg layer with a thickness gradient. It exploits the thickness dependence of the hydrogenation thermodynamics of Pd-capped Mg thin films. The optical change of the Mg layer during the metal–hydride transition can be detected both in reflection and in transmission. This optical sensor allows a continuous measurement of hydrogen partial pressure in the range between 200 and 4000 Pa.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2010.09.001