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Ferroelectric polarization-enhanced photocatalytic performance of heterostructured BaTiO3@TiO2 via interface engineering

界面工程调控铁电极化增强异质结构BaTiO3@TiO2光催化性能

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Abstract

A catalyst of ferroelectric-BaTiO3@photoelectric-TiO2 nanohybrids (BaTiO3@TiO2) with enhanced photocatalytic activity was synthesized via a hydrolysis precipitation combined with a hydrothermal approach. Compared to pure TiO2, pure BaTiO3 and BaTiO3/TiO2 physical mixture, the heterostructured BaTiO3@TiO2 exhibits significantly improved photocatalytic activity and cycling stability in decomposing Rhodamine B (RhB) and the degradation efficiency is 1.7 times higher than pure TiO2 and 7.2 times higher than pure BaTiO3. These results are mainly attributed to the synergy effect of photoelectric TiO2, ferroelectric-BaTiO3 and the rationally designed interfacial structure. The mesoporous microstructure of TiO2 is of a high specific area and enables excellent photocatalytic activity. The ferroelectric polarization induced built-in electric field in BaTiO3 nanoparticles, and the intimate interfacial interactions at the interface of BaTiO3 and TiO2 are effective in driving the separation and transport of photogenerated charge carriers. This strategy will stimulate the design of heterostructured photocatalysts with outstanding photocatalytic performance via interface engineering.

摘要

采用水解沉淀结合水热法成功合成光催化活性增强的铁电-BaTiO3@光电-TiO2纳米杂化光催化剂(BaTiO3@TiO2)。与纯TiO2, 纯BaTiO3和BaTiO3/TiO2机械混合物相比, 采用异质结构的BaTiO3@TiO2降解罗丹明B (RhB)的光催化活性和循环稳定性得到提升, 其光催化降解效率是纯TiO2的1.7 倍, 纯BaTiO3的7.2 倍。光催化降解效率的提升与光电TiO2, 铁电BaTiO3及两者界面结构的协同效应相关。介孔微结构的TiO2 因高的比表面积而具备优异的光催化活性。纳米BaTiO3因铁电极化产生的内建电场及BaTiO3与TiO2间紧密的界面相互作用而有效地促进光生载流子的分离和传输。通过调控界面工程将促进具有优异光催化性能异质结型光催化剂的设计与开发。

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Funding

Project(cstc2020jcyj-msxmX0930) supported by the Natural Science Foundation of Chongqing, China; Project (KJQN201901522) supported by Technological Research Program of Chongqing Municipal Education Commission, China; Project(cx2020068) supported by the Venture & Innovation Support Program for Chongqing Overseas Returnees, China

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Authors and Affiliations

  1. Chongqing Key Laboratory of Nano/Micro Composites and Devices, College of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China

    Bao-yan Fan  (范保艳), Hai-bo Liu  (刘海波), Zhen-hui Wang  (王振慧), Yi-wen Zhao  (赵夷雯), Sen Yang  (杨森), Si-yi Lyu  (吕思宜), An Xing  (邢安), Jun Zhang  (张均) & Xiao-yan Liu  (刘晓燕)

  2. The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, USA

    He Li  (李禾)

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  1. Bao-yan Fan  (范保艳)
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Correspondence to Xiao-yan Liu  (刘晓燕).

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Contributors

FAN Bao-yan and LIU Xiao-yan provided the concept and edited the draft of manuscript. LIU Hai-bo conducted the literature review and wrote the first draft of the manuscript. WANG Zhen-hui, ZHAO Yi-wen, YANG Sen, and LYU Si-yi conducted experiments and provided relevant data. XING An and ZHANG Jun analyzed the measured data. FAN Bao-yan, LI He and LIU Xiao-yan edited the draft of manuscript and revised the final version.

Conflict of interest

FAN Bao-yan, LIU Hai-bo, WANG Zhen-hui, ZHAO Yi-wen, YANG Sen, LYU Si-yi, XING An, ZHANG Jun, LI He and LIU Xiao-yan declare that they have no conflict of interest.

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Fan, By., Liu, Hb., Wang, Zh. et al. Ferroelectric polarization-enhanced photocatalytic performance of heterostructured BaTiO3@TiO2 via interface engineering. J. Cent. South Univ. 28, 3778–3789 (2021). https://doi.org/10.1007/s11771-021-4847-y

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