Solid-state hydrogen sensors using palladium-nickel alloys: Effect of alloy composition on sensor response
- Sandia National Labs., Albuquerque, NM (United States)
Thin film alloys of Pd and Ni make good sensors for hydrogen partial pressures (pH[sub 2]) over a very wide range: from 10[sup [minus]3] to 700 Torr. For pH[sub 2] from 1 to 700 Torr the atomic percent of Ni in the alloy has a strong effect on the change in film resistance which is used as the sensing property. The phase transition from the [alpha]- to the hydride [beta]-phase must be avoided to maintain a reversible sensor. The characteristics of alloys with Ni of 3, 5.3, 8, and 15% are reported. The phase transition was found in the 5.3% alloy at about 250 Torr, but alloys of Ni >8% showed no phase change behavior up to 630 Torr (pure H[sub 2]) at ambient temperatures. Other characteristics of the Pd/Ni alloy sensors are also reported, including the effect of temperature, oxygen, and relative humidity, and the speed of response to step changes in pH[sub 2].
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 6564320
- Journal Information:
- Journal of the Electrochemical Society; (United States), Vol. 142:1; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HYDROGEN
MONITORING
MONITORS
PERFORMANCE
NICKEL ALLOYS
CHEMICAL COMPOSITION
PALLADIUM BASE ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
ELECTRIC CONDUCTIVITY
ALLOYS
ELECTRICAL PROPERTIES
ELEMENTS
MEASURING INSTRUMENTS
NONMETALS
PALLADIUM ALLOYS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PLATINUM METAL ALLOYS
080800* - Hydrogen- Properties & Composition