Superfast and efficient hydrogen gas sensor using PdAualloy@ZnO core–shell nanoparticles,Journal of Materials Chemistry A

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Superfast and efficient hydrogen gas sensor using PdAualloy@ZnO core–shell nanoparticles
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-12 , DOI: 10.1039/d0ta03552a
Hu-Jun Le _{1,

2,

3,

4,

5} , Dung Van Dao _{1,

2,

3,

4,

5} , Yeon-Tae Yu _{1,

2,

3,

4,

5}

Affiliation

For ensuring the safety use of renewable hydrogen energy sources, it is urgently demanded to design rapid and sensitive sensors to detect leakage. In this study, we have successfully prepared highly responsive, stable, and selective sensors for hydrogen gas using PdAu_alloy@ZnO core–shell nanoparticles (CSNPs). The fabricated core–shell sensors exhibit superior hydrogen sensing activity as compared to pure ZnO. In particular, the Pd₃₅Au₆₅@ZnO sensor shows the highest response (80), fastest response/recovery times (0.6/12.0 min), and lowest optimal working temperature (300 °C) towards 100 ppm hydrogen. The improved hydrogen sensing can be attributed to the following: (1) the oxidation of Pd metal in the alloy cores is significantly limited, which in turn increases the interaction between Pd and the target gas; (2) the content of active oxygen species is enriched in the presence of the Au metal; (3) the PdAu alloy cores have excellent selective capability towards hydrogen gas as they produce PdH_x compounds; and (4) the synergistic combination between Pd, Au, and ZnO parts can further speed the response and recovery times for the PdAu_alloy@ZnO core–shell sensors. This work provides a new approach for designing versatile hydrogen sensors using alloy@oxide core–shell nanostructures accordingly.

中文翻译：

使用PdAualloy @ ZnO核壳纳米粒子的超快速高效氢气传感器

为了确保安全使用可再生氢能源，迫切需要设计快速灵敏的传感器来检测泄漏。在这项研究中，我们已经成功地使用PdAu_合金@ZnO核壳纳米粒子（CSNPs）为氢气制备了高响应性，稳定和选择性的传感器。与纯ZnO相比，预制的核壳传感器表现出卓越的氢感测活性。特别是Pd ₃₅ Au ₆₅ZnO传感器对100 ppm氢气显示出最高响应（80），最快响应/恢复时间（0.6 / 12.0分钟）和最低最佳工作温度（300°C）。改进的氢感测可以归因于以下方面：（1）显着限制了合金芯中Pd金属的氧化，这反过来增加了Pd与目标气体之间的相互作用；（2）在金金属的存在下，活性氧的含量增加了；（3）PdAu合金核产生PdH _x化合物时，对氢气具有出色的选择性；（4）Pd，Au和ZnO零件之间的协同结合可以进一步加快PdAu_合金的响应和恢复时间@ZnO核壳传感器。这项工作为使用合金@氧化物核-壳纳米结构设计多功能氢传感器提供了一种新方法。

更新日期：2020-07-07

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