基于CeO2-Co3O4纳米纤维的催化发光式甲醛传感器研究

引用本文: 胡明江, 吕春旺, 杨师斌, 王忠. 基于CeO₂-Co₃O₄纳米纤维的催化发光式甲醛传感器研究[J]. 分析化学, 2017, 45(11): 1621-1627. doi: 10.11895/j.issn.0253-3820.170221 shu

Citation: HU Ming-Jiang, LYU Chun-Wang, YANG Shi-Bin, WANG Zhong. Research on Cataluminescence Type Formaldehyde Sensor Based on CeO₂-Co₃O₄ Nanofibers[J]. Chinese Journal of Analytical Chemistry, 2017, 45(11): 1621-1627. doi: 10.11895/j.issn.0253-3820.170221 shu

基于CeO₂-Co₃O₄纳米纤维的催化发光式甲醛传感器研究

1.
河南城建学院能源与建筑环境工程学院, 平顶山 467036;
2.
江苏大学汽车与交通工程学院, 镇江 212013
基金项目:
本文系国家自然基金项目（No.51376083）和河南省高等学校重点科研项目（No.18A470002）资助

摘要: 采用双喷嘴静电纺丝法制备了CeO₂-Co₃O₄纳米纤维，将制备的CeO₂-Co₃O₄纳米纤维均匀涂覆于μ型加热线圈表面形成催化发光薄膜，设计了一种新型催化发光甲醛传感器。采用X射线衍射仪、扫描电子显微镜、全自动程序化学吸附仪和X-射线光电子能谱仪，表征了Co₃O₄-CeO₂纳米纤维的相组成和微观形貌，讨论了甲醛在CeO₂-Co₃O₄催化剂表面的电化学特性和催化发光机理。在优化条件下，即波长500 nm、温度550℃、载气流速0.2 L/min，甲醛传感器件（Ce30）催化发光强度与甲醛浓度在1.2-50μg/m³范围内有良好的线性关系，灵敏度为40.04 a.u./（μg/m³），检出限为1.2μg/m³，动态响应和恢复时间分别为2.4和3.5 s。此传感器可用于汽车尾气中甲醛浓度检测，相对误差范围为0.4%-1.1%，相对标准偏差RSD<3%（n=6）。

关键词:

English

Research on Cataluminescence Type Formaldehyde Sensor Based on CeO₂-Co₃O₄ Nanofibers

1.
School of Energy and Building Environmental Engineering, Henan University of Urban Construction, Pingdingshan 467036, China;
2.
School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
Received Date: 12 April 2017
Revised Date: 20 August 2017
Fund Project:
This work was supported by the National Natural Science Foundation of China (No.51376083) and the Educational Commission of He'nan Province of China (No.18A470002)

Abstract: CeO₂-Co₃O₄ composite nanofibers were prepared by the double jets electrospinning method. The nanofibers were then deposited onto the surface of a μ-type heating coil as cataluminescence material to prepare a new cataluminescence (CTL) type formaldehyde gas sensor. The crystalline phase and microstructure of CeO₂-Co₃O₄ composite nanofibers were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM), and the cataluminescence mechanism and electrochemical characteristic of formaldehyde on the surface of CeO₂-Co₃O₄ nanofibers were analyzed by H2 temperature programmed reduction (H2-TPR) and X-ray photoelectron spectroscopy (XPS). Under the optimal conditions (500 nm of wavelength, 0.2 L/min of flow rate and 550℃), there was a good relationship between the CTL intensity of this formaldehyde gas sensor (Ce30) and formaldehyde concentration in the range of 1.2-50 μg/m³, the sensitivity was 40.04 a.u./(μg/m³), the detection limit was 1.2 μg/m³, the dynamic response time and recover time of formaldehyde gas were 2.4 s and 3.5 s, respectively. The formaldehyde sensor was successfully applied to the determination of formaldehyde in the automotive exhaust, with relative errors of 0.39%-1.07% and relative standard deviations of less than 3%.

Key words:

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基于CeO₂-Co₃O₄纳米纤维的催化发光式甲醛传感器研究

English

Research on Cataluminescence Type Formaldehyde Sensor Based on CeO₂-Co₃O₄ Nanofibers

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