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A planar mixed-potential type sensor consisting of La 0.8 Sr 0.2 Cr 0.5 Fe 0.5 O 3-δ sensing electrode, yttria-stabilized zirconia solid electrolyte, and Pt reference electrode was developed for H 2 detection. The sensor showed high and repeatable response with a value of -143.6 mV for 1000 ppm of H 2 at 450 °C. The sensor response varied linearly or logarithmically with the hydrogen concentration in the range of 20-100 ppm and 100-1000 ppm of H 2 , respectively. The response/recovery time generally decreased with increasing concentration and temperature, and reached almost steady above 300 ppm of H 2 . Response time as short as 4 s and recovery time of 24 s were attained at 450 °C for 500 ppm. The sensor exhibited excellent selectivity to hydrogen against interference of CH 4 , C 3 H 8 , CO, NO 2 , and NH 3 . The mixed-potential mechanism was assessed by electrochemical measurements, and the sensing behavior was discussed in relation to the reaction kinetics. The excellent H 2 sensing performance for concentrations above 100 ppm is ascribed to the high electrocatalytic activity of the perovskite electrode to H 2 oxidation. The inferior performance for lower H 2 concentrations may be related with slow gas diffusion in the electrode.

acs applied materials and interfaces

Fast Response, Highly Sensitive and Selective Mixed-Potential H<sub>2</sub> Sensor Based on (La, Sr)(Cr, Fe)O<sub>3-δ</sub> Perovskite Sensing Electrode

Fast Response, Highly Sensitive and Selective Mixed-Potential H2 Sensor Based on (La, Sr)(Cr, Fe)O3-δ Perovskite Sensing Electrode

Fast Response, Highly Sensitive and Selective Mixed-Potential H₂ Sensor Based on (La, Sr)(Cr, Fe)O_3-δ Perovskite Sensing Electrode