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纳米二氧化铈上活性氧物种的氧空穴团簇捕集位点

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王少莘, 解文, 余运波. 纳米二氧化铈上活性氧物种的氧空穴团簇捕集位点[J]. 环境工程学报, 2018, 12(4): 1120-1127. doi: 10.12030/j.cjee.201712186
引用本文: 王少莘, 解文, 余运波. 纳米二氧化铈上活性氧物种的氧空穴团簇捕集位点[J]. 环境工程学报, 2018, 12(4): 1120-1127. doi: 10.12030/j.cjee.201712186
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WANG Shaoxin, XIE Wen, YU Yunbo. Oxygen vacancy clusters as trapping sites for active oxygen species on nanoceria[J]. Chinese Journal of Environmental Engineering, 2018, 12(4): 1120-1127. doi: 10.12030/j.cjee.201712186
Citation: WANG Shaoxin, XIE Wen, YU Yunbo. Oxygen vacancy clusters as trapping sites for active oxygen species on nanoceria[J]. Chinese Journal of Environmental Engineering, 2018, 12(4): 1120-1127. doi: 10.12030/j.cjee.201712186
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纳米二氧化铈上活性氧物种的氧空穴团簇捕集位点

  • 1.

    中国科学院生态环境研究中心，, 北京 100085

  • 2.

    中国科学院大学，北京 100049

  • 3.

    中国科学院城市环境研究所，中国科学院区域大气环境研究卓越创新中心，厦门 361021

  • 基金项目:

    天津市科技计划项目（16YFXTSF00290）

    国家自然科学基金资助项目（21673277）

    国家重点研发计划（2017YFC0211105）

Oxygen vacancy clusters as trapping sites for active oxygen species on nanoceria

  • 1.

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

  • 2.

    University of Chinese Academy of Sciences, Beijing 100049, China

  • 3.

    Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China

  • Fund Project:

  • 摘要: 二氧化铈（CeO2）是一种性能优异的催化材料，已广泛应用于大气污染物的控制，这与其优异的储放氧性能即氧空穴的形成、消除相关；研究氧空穴在上氧物种的形成及活性对设计高效的铈基催化剂具有重要意义。X射线光电子能谱(XPS)、正电子湮没寿命谱(PAS)、氢气-程序升温还原(H2-TPR)研究结果表明，不同形貌的CeO2纳米材料上氧空穴团簇大小、相对强度、单位面积上Ce3+浓度的乘积与高活性氧物种的量之间呈线性相关，这一定量关系揭示氧空穴团簇是CeO2纳米材料上活性氧物种的捕集位点，对认识CeO2催化作用机制具有理论指导意义。
    Abstract: Ceria (CeO2) as an efficient catalytic material, has been extensively investigated in air pollution control, which largely originates from its remarkable ability to release and store oxygen via the formation and healing of oxygen vacancies, respectively. Understanding of oxygen vacancies in creating and supplying of active oxygen species is therefore fundamental for designing ceria based catalysts with high performance. By applying complementary techniques of X-ray photoelectron spectroscopy (XPS), positron annihilation spectroscopy (PAS), and H2 temperature-programmed reduction (H2-TPR), herein, an excellent linear correlation between the contribution of oxygen vacancy clusters (size and relative intensity of oxygen vacancy clusters, and concentration of Ce3+ on unit area) and the amount of the most easily reducible surface oxygen was first revealed on nanoceria with different shapes. The finding indicates that oxygen vacancy clusters may serve as trapping sites for the active surface oxygen on nanoceria, may also be fundamental for revealing the intrinsic role of ceria in catalysis.
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  • 刊出日期:  2018-04-22

纳米二氧化铈上活性氧物种的氧空穴团簇捕集位点

  • 1. 中国科学院生态环境研究中心，, 北京 100085
  • 2. 中国科学院大学，北京 100049
  • 3. 中国科学院城市环境研究所，中国科学院区域大气环境研究卓越创新中心，厦门 361021
基金项目:

天津市科技计划项目（16YFXTSF00290）

国家自然科学基金资助项目（21673277）

国家重点研发计划（2017YFC0211105）

摘要: 二氧化铈（CeO2）是一种性能优异的催化材料，已广泛应用于大气污染物的控制，这与其优异的储放氧性能即氧空穴的形成、消除相关；研究氧空穴在上氧物种的形成及活性对设计高效的铈基催化剂具有重要意义。X射线光电子能谱(XPS)、正电子湮没寿命谱(PAS)、氢气-程序升温还原(H2-TPR)研究结果表明，不同形貌的CeO2纳米材料上氧空穴团簇大小、相对强度、单位面积上Ce3+浓度的乘积与高活性氧物种的量之间呈线性相关，这一定量关系揭示氧空穴团簇是CeO2纳米材料上活性氧物种的捕集位点，对认识CeO2催化作用机制具有理论指导意义。

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