Boosting Room Temperature Sensing Performances by Atomically Dispersed Pd Stabilized via Surface Coordination,ACS Sensors

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Boosting Room Temperature Sensing Performances by Atomically Dispersed Pd Stabilized via Surface Coordination
ACS Sensors ( IF 8.2 ) Pub Date : 2021-02-12 , DOI: 10.1021/acssensors.0c02369
Xiao-Liang Ye ₁ , Shu-Juan Lin ₁ , Jiang-Wei Zhang ₂ , Hui-Jie Jiang ₁ , Lin-An Cao ₁ , Ying-Yi Wen _{1,

3} , Ming-Shui Yao ₁ , Wen-Hua Li ₁ , Guan-E Wang _{1,

3} , Gang Xu _{1,

3}

Affiliation

The urgent requirement of monitoring air pollution worldwide evokes intensive research interest in developing chemiresistive gas sensing techniques. To overcome the limits in sensitivity and selectivity of room temperature (RT) chemiresistive sensing materials, a new strategy using single-atom catalysts (SACs) via surface coordination is proposed. As a proof-of-concept, single Pd atoms on TiO₂ (Pd₁-TiO₂) possess high efficiency in generating adsorbed O₂^– as well as high activity and selectivity in catalyzing CO oxidation at RT. As a result, Pd₁-TiO₂ shows record high sensitivity among the reported RT sensing materials, which is even comparable to those of the best materials working at high temperature. It also provides an approximately 1 order of magnitude lower limit of detection than the best CO sensing materials. Moreover, Pd₁-TiO₂ presents high selectivity toward 12 kinds of interference gases. This work not only paves a way to design high-performance RT gas sensing materials but also extends the application of SACs.

中文翻译：

通过表面配位稳定的原子分散Pd提升室温感测性能

监测全球空气污染的迫切需求引起了对开发化学阻滞气体传感技术的广泛研究兴趣。为了克服室温化学反应敏感材料的灵敏度和选择性的局限性，提出了一种通过表面配位使用单原子催化剂（SAC）的新策略。作为验证的概念，在TiO单个钯原子₂钯（Pd ₁ -TiO ₂）具有高的效率生成吸附ö ₂^-以及在RT催化CO氧化高活性和选择性。结果，Pd ₁ -TiO ₂在已报道的RT传感材料中显示出创纪录的高灵敏度，甚至可以与在高温下工作的最佳材料相媲美。与最佳的CO传感材料相比，它还提供了大约1个数量级的检测下限。此外，Pd ₁ -TiO ₂对12种干扰气体具有高选择性。这项工作不仅为设计高性能RT气体传感材料铺平了道路，而且扩大了SAC的应用范围。

更新日期：2021-03-26

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