electrochemical sensing

gas sensing

gas sensors

sensing electrode

sensing properties

gas sensor

sensing performance

nm riu

Sensors and Actuators B Chemical

• Porous spherical SnO 2 -based materials were synthesized by a hydrothermal method. • Sensor response to H 2 was greatly improved by 5.0 % molar ratio Pd decoration. • Hydrogen sensing properties were enhanced by 10 mW/cm 2 UV irradiation. • Excellent H 2 selectivity and high stability were achieved with UV irradiation. • The enhancement mechanism of sensing properties to H 2 was systematically studied. The rapid and efficient detection of hydrogen plays an important role in the development of hydrogen energy. The response and selectivity of typical metal oxide semiconductor (MOS) sensors to low concentration hydrogen detection still need to be improved to meet the application of hydrogen. In this work, Pure SnO 2 hollow spheres and different molar ratio of Pd decorated SnO 2 spherical composites were synthesized by a facile template-free hydrothermal method. High response of 14.5 and fast response/recovery time of 2.2/22.4 s to 200 ppm hydrogen were achieved by 5.0 mol% Pd/SnO 2 at 330 °C. The response to 200 ppm hydrogen was enhanced to 18.1 and the recovery time was also improved to 17.4 s with 10 mW/cm 2 UV irradiation. Especially, the response to interfering gases was inhibited with UV irradiation, which improved the selectivity of as-prepared sensors to hydrogen molecules. Linear dependence of the responses of as-prepared sensors on the hydrogen concentration was observed, indicating the great potential for quantitative detection of H 2 at ppm level. This work provides a facile route to synthesize porous spherical Pd/SnO 2 for hydrogen detection and a reference for the future design of hydrogen detectors with UV irradiation.

Hydrogen sensing properties of Pd/SnO2 nano-spherical composites under UV enhancement