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Flower-like Bi0/CeO2−δ plasmonic photocatalysts with enhanced visible-light-induced photocatalytic activity for NO removal

花型Bi0/CeO2−δ等离子体光催化剂增强可见光光 催化去除NO

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Abstract

Plasmonic bismuth (Bi0) nanoparticle-decorated flower-like CeO2−δ (Bi0/CeO2−δ) photocatalysts with abundant oxygen vacancies (OVs) were synthesized via a solvothermal method. The OVs can not only improve the separation of electron-hole pairs, but also facilitate the adsorption and activation of gas molecules (NO/O2). In addition, the Bi0 nanoparticles can enhance the visible light response and prevent the recombination of charge carriers by virtue of the surface plasmon resonance (SPR) effect, achieving an excellent ability for NO elimination and NO2 inhibition under visible light irradiation. Density functional theory (DFT) calculations confirm that the Schottky barrier between Bi0 and CeO2−δ accompanied with the OVs are pivotal for the migration of photogenerated charge carriers to involve in the photocatalytic NO removal. Trapping experiments and in situ FTIR spectroscopy were conducted to explore the mechanism of the photocatalytic NO removal, suggesting that the photocatalytic NO removal can be significantly enhanced by introducing abundant OVs and the involvement of Bi0 metal nanoparticles.

摘要

本文利用溶剂热法合成了Bi0纳米颗粒修饰的富氧空位 (OVs)花型CeO2−δ (Bi0/CeO2−δ)光催化剂. OVs不仅能够加速电子-空穴对的分离, 而且有利于气体分子(NO/O2)的吸附和活化. 此外, Bi0纳米颗粒具有表面等离子体共振效应, 它能够提高催化剂的可 见光响应、减少光生载流子的复合. Bi0/CeO2−δ光催化剂在可见光 下具有优异的一氧化氮(NO)去除活性, 并可有效抑制NO2生成. 密 度泛函理论(DFT)计算证实, Bi0与CeO2−δ界面处的肖特基势垒以及 OVs的存在促进了载流子的分离, 进而参与NO的光催化去除. 通过 捕获实验和原位红外光谱分析了Bi0/CeO2−δ催化剂光催化去除NO 的机理, 研究表明丰富的OVs和金属纳米颗粒负载能够显著提高材 料光催化去除NO的性能.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51772183, 21673118 and 21972067), the Key Research and Development Program of Shaanxi Province (2018ZDCXL-SF-02-04), the Natural Science Foundation of Hubei Province (2019CFB225), and the Fundamental Research Funds for the Central Universities (GK201903023 and GK201801005).

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Authors and Affiliations

  1. School of Physics and Information Technology, Shaanxi Normal University, Xi’an, 710062, China

    Junli Nie  (聂俊丽), Jianzhi Gao  (高健智), Fei Rao  (饶斐) & Gangqiang Zhu  (朱刚强)

  2. Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing, 211816, China

    Qian Shen  (申茜)

  3. School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou, 434023, China

    Weibin Zhang  (张伟斌)

  4. Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, 10623, Berlin, Germany

    Mirabbos Hojamberdiev

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  1. Junli Nie  (聂俊丽)
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  2. Jianzhi Gao  (高健智)
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  7. Gangqiang Zhu  (朱刚强)
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Contributions

Zhu G and Shen Q designed the project; Nie J and Rao F performed the experiments; Nie J, Zhang W and Rao F performed the data analysis; Zhu G, Zhang W and Gao J contributed to the theoretical analysis; Nie J, Zhu G, Shen Q and Hojamberdiev M wrote the paper. All authors contributed to the general discussion.

Corresponding authors

Correspondence to Qian Shen  (申茜) or Gangqiang Zhu  (朱刚强).

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Conflict of interest

The authors declare no competing financial interest.

Junli Nie is now pursuing her Master degree in the School of Physics and Information Technology, Shaanxi Normal University. Her current research interest mainly lies in the preparation of photocatalytic materials and their photocatalytic activity for NO removal.

Gangqiang Zhu is now a professor in the School of Physics and Information Technology, Shaanxi Normal University. He received his PhD from Xi’an Jiaotong University (XJTU) in 2012. His research interests mainly focus on the high-performance photocatalytic materials and their photocatalytic mechanisms for environmental purification. He has published more than 100 peer-reviewed papers with over 3000 citations and his H-index is 29.

Qian Shen received her BSc in chemistry from China Agriculture University in 2008 and her PhD in physical chemistry from Peking University in 2013. She was a research fellow at National University of Singapore from 2013 to 2015. She is currently an associate professor at the Institute of Advanced Materials (IAM), Nanjing Tech University. Her current research interest is mainly about surface chemistry.

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40843_2020_1467_MOESM1_ESM.pdf

Flower-like Bi0/CeO2−δ plasmonic photocatalysts with enhanced visible-light-induced photocatalytic activity for NO removal

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Nie, J., Gao, J., Shen, Q. et al. Flower-like Bi0/CeO2−δ plasmonic photocatalysts with enhanced visible-light-induced photocatalytic activity for NO removal. Sci. China Mater. 63, 2272–2280 (2020). https://doi.org/10.1007/s40843-020-1467-7

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