Low temperature and fast response hydrogen gas sensor with Pd coated SnO2 nanofiber rods

In this work, we introduced a structure of Pd coated SnO2 nanofiber rods (NFRs) prepared by electrospinning and magnet sputtering. Pd was first deposited on the obtained nano fibers as a catalyst and then fully dispersed during the resulting of SnO2 to improve the hydrogen response. The gas sensing tests showed the palladium enhanced the hydrogen response at low temperature (160 degrees C). When the hydrogen gas concentration was 100 ppm, the limit of detection (LOD) of sensor was as low as 0.25 ppm and the response time was as short as 4 s. Moreover, Pd coated SnO2 also had excellent hydrogen selectivity and repeatability. The gas sensor was suitable for the detection of hydrogen in low-temperature environment. This work provided a new method for the low temperature hydrogen gas sensor with a fast response and low LOD. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.