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钴酸镧/氧化铈异质结纳米材料对甲醛气敏性能研究

胡明江 ,  吕春旺 ,  王旭荣 ,  牛哲荟

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引用本文: 胡明江, 吕春旺, 王旭荣, 牛哲荟. 钴酸镧/氧化铈异质结纳米材料对甲醛气敏性能研究[J]. 分析化学, 2023, 51(2): 250-258. doi: 10.19756/j.issn.0253-3820.221395 shu
Citation:  HU Ming-Jiang,  LYU Chun-Wang,  WANG Xu-Rong,  NIU Zhe-Hui. Heterojunction LaCoO3/CeO2 Nanomaterial-based Gas Sensor for Formaldehyde Detection and Its Sensitive Mechanism[J]. Chinese Journal of Analytical Chemistry, 2023, 51(2): 250-258. doi: 10.19756/j.issn.0253-3820.221395 shu

钴酸镧/氧化铈异质结纳米材料对甲醛气敏性能研究

  • 1.

    河南城建学院能源与建筑环境工程学院, 平顶山 467036;

  • 2.

    华北电力大学能源动力与机械工程学院, 保定 071003

    • 通讯作者: 胡明江,E-mail:hu_mingjiang@163.com
  • 基金项目:

    河南省科技攻关计划项目(No.212102210199)资助。

摘要: 采用溶胶-凝胶法制备了LaCoO3和表面改性的LaCoO3/CeO2纳米材料，将其均匀涂覆于氧化铝陶瓷管表面形成敏感薄膜，用于快速检测甲醛。采用扫描电子显微镜（SEM）、X射线光电子能谱仪（XPS）等方法对样品的微观结构和电化学特性进行了分析，结果表明，LaCoO3可有效改善CeO2的吸附氧含量、异质结组成和催化氧化还原性能。传感器气敏特性测试结果表明，工作温度为150℃时，LaCoO3/CeO2对甲醛（20 μg/m3）的响应值为60.1，响应/恢复时间为5.6/9.8 s，检出限（S/N=6）为1.0 μg/m3。利用密度泛函理论（DFT）方法，计算了LaCoO3/CeO2的功函数、总态密度和能带分布。从表面氧吸附过程、异质结作用和LaCoO3催化氧化还原循环等角度，探讨了LaCoO3/CeO2对甲醛的气敏机理，证实了LaCoO3是一种改善金属氧化物半导体传感器气敏性能的优良催化剂。

English


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  • 收稿日期:  2022-08-02
  • 修回日期:  2022-09-26
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