Gas Polarographic Hydrogen Sensor Using a Zirconia Electrolyte

Abstract

The hydrogen-sensing capability of a gas polarographic oxygen sensor using a zirconia electrolyte has been investigated at 450°C and 1 atm in H 2 -N 2 gas mixtures. The limiting current was realized in H 2 -N 2 gas mixtures due to the artificial hydrogen diffusion overpotential behavior at the anode, and is proportional to the hydrogen concentration up to 5% in H 2 -N 2 gas mixtures. This result proved that this oxygen sensor can also detect the hydrogen in H 2 -inert-gas mixtures.