期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 263, 期 -, 页码 369-376出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.02.103
关键词
Sub-stoichiometric WO2.9; Platinum; Electro-catalyst; Formaldehyde; Electro-oxidation; Gas sensor
资金
- NSFC, China [21527806, 21575136]
- Department of Science and Techniques of Jilin Province [20170203004SF, 20160201008GX]
- Jilin Province Development and Reform Commission [2017C053-1]
- Science and Technology Bureau of Changchun [15SS05]
The detection of formaldehyde (HCHO) in indoor environment is becoming more and more important. Here, a novel composites catalyst based on platinum and tungsten oxide was prepared for electrooxidation of formaldehyde and used to design a simply equipped amperometric gas sensor. Considering that the modulation of atomic structure could effectively improve the properties of materials and enhance catalytic capability, we have regulated the local atomic structure of a commercial product of WO3 into the highly active sub-stoichiometric W02.9 to be an efficient co-catalyst through a facile thermal treatment. Pt-WOx (X = 3, 2.9) nanocomposites were prepared by physical ultrasound and further characterized by XRD, XPS, TEM, SEM techniques. The electro-catalytic oxidation of formaldehyde at the Pt-WOx modified glassy carbon electrode was studied by cyclic voltammetry. Pt-WO2.9 (15%) exhibited better electrochemical activity with a higher oxidation peak current of 1.5 mA than that of Pt-WO3 (15%) and pure Pt. It is worth noting that reducing the platinum content in catalysts improves the catalytic activity. The Pt-WO2.9 based formaldehyde sensor displays a high sensitivity of 53 A/ppm and good reproducibility and stability. Thanks to the tailored electronic structure (oxygen vacancies) of tungsten oxide, the as-prepared Pt-WO2.9 nanocomposites might become a promising candidate for practical application of detecting formaldehyde. (C) 2018 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据