Evaluation of the Response of High-Temperature Hydrogen Sensors for Fusion Applications

Abstract

The use of hydrogen gas in different chemical processes and industries is common. Hydrogen gas has to be monitored in order to provide control of reactions, detect leakages or avoid accumulations in confined spaces, among many other applications. In this frame, and depending on its final application there is a need to develop hydrogen sensors capable to operate in all kinds of conditions in terms of concentration range and temperature. Moreover, these sensors should provide measurements with high sensitivity, selectivity and fast response time. Furthermore, logistical properties such as low cost, long-term stability and easy operation should also be considered in all applications. In the present work, solid-state electrolyte based amperometric sensors were constructed to measure hydrogen gas under high-temperature conditions. BaCe0.6Zr0.3Y0.1O3-α electrolyte (BCZY) was obtained by the solid-state method and characterized using SEM and XRD. Then, BCZY powder was sintered as a pellet and sealed to an alumina tube to construct the sensors. Finally, operational conditions were optimized and the analytical parameters of these sensors were evaluated at 500 °C and 600 °C. All measurements were performed in an argon atmosphere containing different hydrogen concentrations.