丙酮
吸附
形态学(生物学)
六方晶系
热液循环
材料科学
化学工程
钴
化学
分析化学(期刊)
色谱法
无机化学
结晶学
有机化学
工程类
遗传学
生物
作者
Zhaohui Lei,Fan Dang,Geyu Lu,Songlin Li,Tianliang Wang,Yiyang Xu,Luping Xu,Pengfei Cheng
标识
DOI:10.1016/j.cej.2023.144297
摘要
This work successfully synthesized a series of Co3O4 hexagonal particles with controlled morphology via a one-pot hydrothermal method by using NH4F as a structure-directing agent. The amount of NH4F added significantly influenced the products’ hexagonal morphology, which further affected the acetone sensing performance. In particular, the Co3O4 samples with hollow hexagram structures (S-5) different from other samples were obtained with the amount of 42 mmol NH4F. The sensors fabricated with the prepared Co3O4 samples were investigated to figure out the gas sensing performance. Compared to others, the hollow hexagram Co3O4 sensor (S-5) revealed the highest response of 23.32 to 100 ppm acetone at a low working temperature of 150 °C, with a response/recovery time of 48 s/45 s and the lowest limitation of detection was as low as 22 ppb. The excellent sensing performance of the hollow hexagram Co3O4 sample is largely related to the high utilization of exposed active sites and the massive chemical adsorbed oxygen species offered by the specific hollow structure. In addition, the adsorption energies (EAds) between two different cobalt atoms and acetone on the (1 1 1) plane of Co3O4 were simulated and calculated by DFT, to further elucidate the mechanism of Co3+ for the ultra-high performance to acetone.
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