EFFECT OF Pt AND Pd ADDITIVES ON THE HYDROGEN SENSITIVITY OF SEMICONDUCTOR SENSORS AND THEIR CATALYTIC ACTIVITY IN OXIDATION OF HYDROGEN

We have studied the effect of small additives of Pt and Pd on the hydrogen sensitivity of semiconductor adsorption sensors based on SnO2 and on the catalytic activity of sensor materials of the same composition in oxidation of hydrogen. We have shown that as the amount of Pt or Pd increases, the catalytic activity increases and the sensitivity of the sensors passes through a maximum. The results obtained are explained taking into account the hydrogen spillover phenomenon.