Abstract
This paper reports the fabrication and characterization of a high-concentration potentiometric hydrogen sensor for fuel-cell vehicle applications. Hydrogen sensors have been mainly developed for detecting hydrogen at concentrations less than the lower explosion limit of 4% in air. However, a wide detection range is required to monitor and control hydrogen concentrations in hydrogen fuel-cell vehicles. We demonstrated a cost-effective and wide detection-range Nafion-based potentiometric hydrogen sensor. The conventional hot-pressing method was used to fabricate a small-sized and multilayer structure comprising a Nafion membrane and Pt-C electrodes. The dependence of the sensor performance on the hydrogen concentration, relative humidity, pressure, and temperature was examined. The fabricated sensor exhibited a response to hydrogen gas in a concentration range of 20–99.99% and a high performance reliability against environmental variations. The simple structure and reliable operation of the sensor make it promising for practical applications.
Published Version
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