| 摘要 |
A hydrogen sensor includes a first electrode 3 and a second electrode 4 provided in contact with a proton conduction layer 2 ; a gas diffusion controlling portion 6 provided between a measurement gas atmosphere and the first electrode 3 ; and a support element ( 1 a, 1 b) for supporting the proton conduction layer 6 , the first electrode 3 , the second electrode 4 , and the gas diffusion controlling portion 6 . Hydrogen contained in a measurement gas introduced via the gas diffusion controlling portion 6 is dissociated, decomposed, or reacted by applying a voltage between the first electrode 3 and the second electrode 4 to thereby generate protons. Hydrogen concentration is obtained on the basis of a limiting current generated as a result of the generated protons being pumped out via the proton conduction layer 2 from the first electrode 3 side of the proton conduction layer to the second electrode 4 side of the proton conduction layer. Hydrogen concentration on the first electrode 2 is controlled to a partial pressure of not less than 10<SUP>-12 </SUP>atm, or more preferably, of not less than 3x10<SUP>-12 </SUP>atm and of less than 10<SUP>-2 </SUP>atm.
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