Abstract
In many industrial fields, there is a need to design and characterize on-line and on-board hydrogen monitoring tools able to operate under extreme conditions. One of these applications is in future nuclear fusion reactors, which will use hydrogen isotopes as a plasma fuel. In this context, the measurement of the concentration of these hydrogen isotopes will be of interest to ensure the correct operating conditions for such reactors. Hydrogen sensors based on solid-state electrolytes will be the first step in the development of new analytical tools able to quantify deuterium and tritium in aggressive environments. In the present work, amperometric hydrogen sensors were constructed and evaluated using two solid-state electrolytes, BaCe0.6Zr0.3Y0.1O3-α and Sr(Ce0.9Zr0.1)0.95Yb0.05O3-α. Prototype sensors were built in order to study their sensitivity in on-line measurements. The experiments were performed in a reactor with a hydrogen-controlled environment. The sensors were evaluated at 500 and 600 °C in amperometric mode by applying 2 and 4 V voltages between electrodes. Both sensors showed increases in sensitivity when the temperature or voltage were increased.
Highlights
In many industrial fields there is a need to design and characterize on-line and on-board gas monitoring tools able to operate under high temperatures
The use of deuterium and tritium is suggested as plasma fuels [4,5,6]
BaCe0.6 Zr0.3 Y0.1 O3-α (BaCeZrY) and Sr(Ce0.9 Zr0.1 )0.95 Yb0.05 O3-α (SrCeZrYb) were selected as the most promising materials to be tested in future hydrogen sensors [18,19]
Summary
In many industrial fields there is a need to design and characterize on-line and on-board gas monitoring tools able to operate under high temperatures. A classic example is in the field of metallurgy, in which gas accumulation may result in residual tensions and cause breakage of the material core or negatively influence the processing [1,2,3]. One of these gases is hydrogen, which is usually controlled using off-line monitoring methods in high-temperature processes. An emerging field covering the development of new analytical tools able to quantify hydrogen and its isotopes is nuclear fusion technology In such reactors, the use of deuterium and tritium is suggested as plasma fuels [4,5,6]. The development of specific probes to measure these isotopes will be of major interest and could provide experimental proof of the tritium self-sufficiency of these reactors
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