Low-temperature hydrogen detection sensor based on CeO 2 -DOPED SnO 2
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Low‑temperature hydrogen detection sensor based on CeO2 ‑DOPED SnO2 Hongru Mou1 · Yue Sun1 · Zhigang Zeng1 · Hongbin Zhao1 · Baoli An1 · Jiaqiang Xu1 · Xiaohong Wang1 Received: 12 February 2020 / Accepted: 30 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Cost-effective H2 detection sensors based on pure and C eO2 (0.5 at%, 1 at%, 1.5 at%, 2 at%, 3 at%, 4 at%)-doped S nO2 semiconductor oxides with both high moisture resistance and low operation temperature were prepared by a simple method. The crystal phase, morphology, and chemical composition of the obtained C eO2-doped SnO2 sample were analyzed and related nO2 gas sensor can be improved a lot with the sensing properties. The results show that the H 2 sensing performance of pure S by CeO2 doping. In particular, gas sensors based on 2 at% C eO2/SnO2 exhibited the greatest performance: high responsiveness at 160 °C (23.7 for 50 ppm hydrogen), about 3 times higher than pure S nO2 sensor (6.9); short response and recovery time (2 and 9 s); good repeatability and long-term stability without any change after 30 days (23.7 for 50 ppm hydrogen), good selectivity, and moisture resistance. Finally, the function of CeO2 on SnO2 gas sensor for H2 detection is discussed.
1 Introduction Nowadays, with the gradual depletion of fossil energy, it is particularly important for the development and application of new energy. Hydrogen ( H2) is considered as one of the most promising and green energy source to solve future energy requirements due to its abundance, renewable, easy synthesis, and non-polluting nature [1–3]. Up to now, hydrogen has extensive applications in various important fields such as, fuel cells for civil transportation, power generators, automobiles, and rockets for space vehicles [4, 5]. However, hydrogen is a colorless and odorless gas, and it is flammable and explosive, so it will inevitably cause some safety problems in the application. H2 may undergo rapid deflagration when mixed with air even in a low concentration (about 4.0%) [6]. In recent years, scientists have explored many ways to quantitatively detect hydrogen, and many different types of hydrogen sensors have been developed. Metal oxide semiconductor (MOS) gas sensors, a kind of solid-state resistive-type gas sensors, have been widely applied in numerous * Jiaqiang Xu [email protected] * Xiaohong Wang [email protected] 1
NEST Lab, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
fields including toxic and explosive gas alarms, air quality monitoring, in-door chemical pollutant monitoring, medical diagnostics via breath analysis and so on [7]. Compared with other sensors, MOS has many advantages: small size, high sensitivity, high operability, simple fabrication, long-term stability, and repeatability. Gas sensors based on nanoscale SnO2 [8–10], ZnO [11–13], TiO2 [14–16], and WO3 [17–19] have been fabricated and studied extensively. Among them, SnO2 is an excellent gas-sensit
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