A ferroelectric capacitor circuit for sensing hydrogen gas having a closed integrated circuit package, a ferroelectric capacitor within the closed integrated circuit package, the ferroelectric capacitor having a bismuth oxide based ferroelectric layer being able to absorb hydrogen gas that is within the closed integrated circuit package, absorbed hydrogen gas chemically reducing a portion of the bismuth oxide based ferroelectric layer into bismuth metal, the ferroelectric capacitor having a ferroelectric voltage, the ferroelectric voltage having a voltage strength, and means for measuring a decrease in the voltage strength of the ferroelectric voltage of the ferroelectric capacitor.