“…Some of the most widely used hydrogen sensor types include semiconductor-type [ 7 ], catalytic combustion-type [ 8 ], field effect transistor (FET)-type [ 9 ], electrolyte-type (electrochemical type) [ 10 ], optical-type [ 11 ], piezo-type [ 12 ], thermo-type [ 13 ], and gasistor-type [ 14 ] sensors. The selectivity, sensitivity, response time, reproducibility, long-term stability, lifetime, and reversibility of these sensors can be determined by the concentration, operating temperature, pressure, and interference effects of impurities.…”