Hydrogen isotope cell and its application to hydrogen isotope sensing

The EMFs of hydrogen isotope cells with H2–D2 gas mixtures against H2 and D2 reference gases were measured at 700°C using CaZr0.90In0.10O3−α as a proton-conducting solid electrolyte. Steady electromotive forces (EMFs) with quick response were obtained. The EMFs were almost linear functions of the gas composition of the H2–D2 mixtures and were consistent with those theoretically estimated. Such defined EMFs can be used to monitor H2/D2 ratios in hydrogen isotope mixtures.